Juan, Your stellar example of online citizen journalism is a high bar set at a time of great disruption within and without historical media. With your tools, skills and command pilot calm, you show us the way ahead toward larger truths. Steady as she goes, my Captain! God Bless, Br. David. :{D}
I spent 9 years in the redi-mix concrete business mostly in QC and sales. We had a saying ''ice cream melts and concrete crack!'' That's what it does when water hydrates and you lose volume and the mud shrinks up because the water looses volume in a particular space. Just like a drying river bottom. Your reporting is stellar as always Juan!
Thanks Juan for another comprehensive clarification and 'to the point' report. Would not miss one after all these months since the beginning of the failure.
This ladies and gentleman is exactly why press and media stories need to be taken with a serious pinch of salt. Then again "hundreds of new cracks in repaired dam" probably sells papers better than "ultra high strength concrete guarantees long spill way life span and great long term value for the stake holders"
Adam Edward yes, salt. It's always mind blowing when one has first hand knowledge if an event or topic and then sees wildly inaccurate news reports. Even NPR is guilty sometimes.
You must remember that Google is a poor company and it is expensive to start up a new television company and you are just the people who made RUclips a success. Now Google don’t need you anymore. Thank you for sharing your amazing video, you have made Oroville understandable for us living outside USA
It's just that RUclips figured they could quietly pull money away from a lot of individual creators without much of a public outcry because creators are only small voices instead of one massive representative voice that YT would be forced to reckon with. Financially hurt creators will eventually find a more equitable and fair platform...
Juan, I had a garage poured 10 yrs ago. I asked about a guarantee of it not cracking, the guy say's to me, "There's 2 kind slabs, cracked ones, and ones that are going to crack".
Thank you Juan for the mighty Luscombe views of the Oroville spillway rebuild and emergency spillway re-engineer and rebuild. Please always include shots of the *green spot* to welcome it's return (as usual) as a rain fed phenomenon.
Thanks for another great and informative video, we all really appreciate your telling it like it really is. Also, I seem to be one of the many who hadn't understood how the RUclips policy worked, this helps. A lot of people don't realize how much work and expense is involved in these "free" videos we all enjoy. Seeing RUclips and various "pirates" trying to hijack all the cream of the top is very frustrating. Please don't give up, you're doing a fantastic job!
It really is tedious how the MSM try to aggravate.Thanks for the sensible update Juan.
7 лет назад+1
Really appreciate your updates, bro. I'm a fifth gen native CAian, but now living in midwest. Thanks so so much. Hairline cracks? That's why God made rebar. Can get bigger than hairline, depends on the soil. Re-bar is powerful tensil strength. Concrete has zero tensil strength. Rebar properly engineered to any structure, will simply not stretch without further specific design objectives. Was in residential, light commercial construction guy in Sacto Valley for over ten years. We know that back in 60s, engineers often speced too light on the rebar. Not so for past 75 years. Tensil strength keeps concrete structure from stretching forces. Concrete's virture is i its compressive strength. Forces which would compress the structure are resisted by the concrete. Perfect combo, not to worry folks.
It’s amazing how main stream media try’s so hard to make a little thing into something huge. I’m glad you post these conferences for us to see how poor the media’s perspective is. I haven’t poured a lot, maybe a 1000 yards of concrete, but every slab had an insignificant crack or two in it.
Really enjoy your landings at end of your videos. Some of them look quite a challenge with winds like you get in your area,and summertime issues with heat and DA. Nice flying Juan much appreciated skills......... Jay
Great Cross Examination of the MSM dolts, Juan. I poured a 14 X 18 concrete woodshop floor this past June. Thickened edges and rebar in the field. I kept it sprayed down with a mist of water for almost 3 months (overkill). Even then I recorded the beautiful spider-web like micro cracks in this woodshop floor. But the water I used, and the mats and water the contractors at Oroville used cured the beautiful concrete just as DESIGNED. Engineering is a beautiful craft!
Hey Juan, another excellent and very informative video. It's appalling the way the shrinkage cracking has been misrepresented and you have done a great job of explaining it.
Hi. Great series on this project. Pity there are people who have NO CLUE what they are talking about and are just reading a question from a piece of paper for rating purposes. Generally speaking the only time they have had any contact with concrete is when they walked on it somewhere. Keep up the good work providing the world with sensible balanced reporting.
I remember one of your videos showing sheeting covering the new pours to keep the cure rate of the concrete consistent through and though. This keeps expansion and contraction uniform so that serious structural faults do not occur. Is this in reference to insignificant surface cracks, or, are these cracks going all the way through? There are test cylinders poured from every batch of concrete on every construction project I have seen to test the compression strength. When a bridge project is done in our state with concrete, these cylinders are compression tested to the point of failure to see the concrete has hardened enough for quality assurance. If compression testing fails to produce the desired results, the contractor has to do it over. I can't even imagine that they do not have certified test results from every batch of concrete that was poured on this project.
Juan, I retired from the fire service, TVF&R surrounding Portland Oregon and while part of that organization I was a team leader on the technical rescue team and part of our structural collapse rescue training involved penetrating and/or moving concrete to rescue victims. I recall clearly a comment by one of our instructors when being trained on properties of the material and that comment regarding the subject of this video was, "It ain't concrete if it doesn't have cracks". After laughter by the class he went on to explain exactly what you are talking about. All concrete has cracks to some degree or another and that process continues throughout the concretes life, at least, that is my understanding.
Yup, YT biting the hand that feeds it! Great video Juan, I really enjoyed the view from up top, beautiful place you've got there. Love from Scotland UK.
Thank you...I needed a Green Spot update...I was really jonesing for GS information. BTW. Cracks in concrete are normally minimized by putting in control joints. The spillway can't have control joints in it because it has to be a uniform, uninterrupted, planar surface. Since you have no control joints, the surface of the concrete will crack, nothing out of the ordinary.
Brilliant documentary as always Juan, nice to see the mainstream media behaving to type; any distortion to create hype. I love the presentations you create, it's wonderfully natural and the added issues like the geese over the rice fields that shows more of life in your part of the USA. The posts on your site provide such a rich view of the true lives of Americans. Long may you keep it up please.
Great reporting as usual, Juan. It looks like the new spillway has typical concrete shrinkage cracking going on and I think you did a great job explaining that. Yes, concrete can be poured with no resulting cracking at all. We poured a 12 inch structural slab on bay mud near San Francisco a year ago and there is not one crack in the slab. But the mix was astronomically expensive and the only reason it was used was to create a cosmetic result for the high end custom home placed atop the slab. The sort of expense on this particular slab is not warranted on a utilitarian spill way. We want successful function at the dam and don't care about the level of cosmetics resulting from a very expensive concrete mix and finish process. God knows this disaster cost enough as it is and I do wonder how the State of California will find the funds to pay for all the other many infrastructure emergency fixes that will be coming down the road resulting from the lack up upkeep along the entire water project. It is a shame that we have to address fear mongering from people who seem to just want to make trouble when we have some real problems that need to be addressed and that are not even being discussed. Keep up the good work, Juan!
Yes sir! I’m a swimmer Pool contract and the first meeting I have with a client I’m 100% sure they understand they during the curing phase there is going to be surface cracking of the pool shell . Scares some people off but it’s just the natural of the beast .
Thank you for your love of the North State, your massive intellectual understanding of building, flying and the other topics you address - your discussion about the winds and other aspects of what brings rains, etc. I hope you continue through the years for we all learn and benefit from everything you put out here.
DM I thought Trump would have defunded npr by now. It’s bullshit that we all support NPR even though half or more of the “public” can’t stand that biased leftist propaganda garbage.
Whens the last time ANY government program was shut down? Does not matter if they are R or D's, they won't kill a program, and even when they say they cut the budget, they don't really cut the budget they just lower the proposed budget increase, and to them that is a cut. The whole government is out of control with their spending, and they don't seem to give a damn.
Do you listen to any other radio now? What RUclips channels do you like for news? One reason I like Juan's videos so much is that he doesn't poke any of my political sore spots!
Wow! You've been a busy boy Juan. I'm impressed that you not only covered all of the recent concerns with hairline cracks and green spots, but also delved into some concerns that I've had for a while, namely how they're going to handle the water table below the emergency spillway, and beefing up the ogee weir at the parking lot. You even managed to get in a video of your first love,,,,the bike! I hope AA,s flight crew scheduling problems don't keep you and your family from enjoying a great holiday .
Thanks for the great reporting Juan, I have been following the Dam's rebuild since February. You do have to deal with some strange people (Berkeley) Keep it up. We are in Sydney Australia.
Got lucky in feb. and happened to stumble onto your RUclips channel after the dam incident . I finally found someone who knows how to report the news . I am a water operator in San Luis Obispo and very interested on your topics about Orville . I donated to your PayPal account and know it was money well spent . We all should share our gratitude towards your efforts . Please keep up the great work .
Where has NPR been all of this time? Have they been reporting on this in the past or is this their first time to cover this disaster-turned amazing feat that has happened in the past year. Thanks to you Juan for such great personal reporting on all of this. I always look forward to hearing your reports!
Juan, I’m doing a current events write up for one of my high school classes about Oroville Dam and I gave you a shout out for doing a great job at simplifying all of the complicated things that DWR have put out, so I thought that you would like to know that I quoted you in a government class of mine.
Great, thank you Juan for the really factual update. Maybe we should make it a point to wait a few days to watch your videos that way you might get your payments.
Like you said, the people going around screaming about the cracks have never laid a foot of concrete before. Kinda like mud drying, it cracks. Top surface cures a lot quicker than concrete deeper. Always love your videos/updates! Enjoy your holiday season buddy =)
Thank you again for your time and effort to bring us these videos. God bless you and I hope you and your family have a wonderful Holidays and Merry Christmas.
Amen to that for Juan and family! Have a happy and safe holiday season and Merry Christmas to you and your family Juan! You have a great family. This from a father of six and grandfather to seven now.
I've worked with and around concrete my whole life,it always cracks. The bond to the rebar and other reinforcements is what's important . Npr? not pro reality. Great video Juan!
Hi Juan, long time no see! I saw signs for Oroville when I went to Quartzite, AZ in Jan.; however, I was in a hurry so didn't get to check out the dam. As usual, you give a concise explanation about what is going on with the dam on a level someone with no engineering knowledge can understand. I really appreciate it. More than anything, I'm SO RELIEVED that dam didn't fail altogether! Nice to hear your voice and see you so elegantly and clearly explain current events surrounding the Oroville Dam! Take Care
Juan, it is so nice not to listen to a reporter's personal opinion on the subject they are reporting on. I raise my cup to you sir. Thank you for doing what a good correspondent is truly expected, reporting the facts. Thank you once again.
Juan, I am pleased contribute to your reporting of the Oroville dam and other subjects that you are interested in through PayPal. Your link included in the description made it simple and I hope others will do the same. As a columnist to our local paper I appreciate informative and truthful reporting and have followed your videos for months. Keep up the good work Juan and I look forward to your future reporting whatever that should be. - Canada
Once again, a professional, informative video. Love the goose flight interlude! Beautiful to watch and appropriate music. Thanks so much Juan for your hard work. Just don’t enjoy yourself so much in the mighty Luscomb. Remember it’s supposed to look like you’re working.
Great to see you again Juan and hear your soothing voice...watch from the passenger side as you fly over Oroville and God's green earth, love the new music - you've got quite the production team inside your own family. I spent a few minutes listening to and watching other u tube videos - O M G ! - one from Perth, Australia was abyssmal. I understand it's harder now for great content like yours ( thanks for the simple explanation ), but be glad the other videos have to face the same scrutiny. Quality content will win out and to do my part - here's a little something to help you over the hump.
I've said it before, the green spot is caused by water runoff from Kelly Ridge. When the soil is saturated the water from Kelly Ridge will runoff onto the dam, during the middle of summer the soil is not saturated and the water will soak into it and the green spot will dry up. The soil is now saturated with water and the green spot has returned. The same thing happens on any hillside below a large community when you have dry summers and wet winters.
I am curious if it would have been better and cheaper to just build a secondary spillway for the emergency overflow case. Everything below the secant cut off wall will be chaos and that trash will all end up back in the river requiring the power plant to shut down and requiring another cleanup. As large an area as that overtopping emergency spillway covers it seems they could have built a standard spillway clear to the river with the same materials.
Juan. Sometime in the last 2 weeks I was unsubscribed from your channel.... Not my doing... I'm subscribed with the notifications again. (I haven't "lost" any of my 71 subscribers. yet....) Great job again.
Another well-informed technical contribution, Juan. The hardening process in concrete combines the drying shrinkage property of the cement and the build-up of heat in the mass as a consequence of the exothermic reaction and cracks are inevitable, particularly in a continuous RC structure such as a spillway. Codes of practice provide various ways to minimise cracking and, in RC, the aim is to restrict cracks to hairline width, say, less than 0.3mm, if at all possible, to limit the ingress of moisture and oxygen which could eventually cause corrosion of the reinforcement. But, in any case, the alkali environment provided by the concrete will prevent corrosion of the reinforcement anyway. I spend my professional life inspecting cracks in buildings, in London, usually as a consequence of a comment in a building survey report. My Twitter handle was originally @Crackoholic but my kids, who’s Street cred is better than mine, advised me this was not a good idea! There is this general misconception also that buildings should not show cracks but it is actually quite normal and we just redecorate on a cyclic basis. The important distinction is between non-structural (cosmetic) and structural cracks that may impair the integrity of the building. Timber is a material that eases and adjusts itself on a seasonal cyclic basis which causes cosmetic cracking in typical locations within buildings. Given the amount of timber used in low-rise buildings on your side of the pond I anticipate that visible cracks are a common feature over there too. So, if the cracks at Oroville are as you have described then the project engineers have done a fine job.
Howard! You said it yourself "to restrict cracks to hairline width, say, less than 0.3mm" and that is correct. Juan said the cracks are half the width of a fingernail. My fingernail is 10mm making the cracks 5.mm. That is enormous and the concrete is still curing. Do you know what will happen when the temp drops below freezing. It will take a few years but the spillway WILL FAIL PERIOD. Jerry Antonetti spotted what they did wrong and they did it wrong because Calif hires depending on who you know NOT what you know. Viva la New Bay Bridge
Hi Juan, Thank you for presenting something to really feel connected to, I sincerely appreciate your Work, and especially your grounded baseline, i am sure you´ll get what i mean, thanks! keep it up, i´ll be watching!!
So I will just what a few days to see your videos from now on or until you tell us it ok to see them when they first come out. keep up the grate work .!!!!!!
Nice "DC3" approach, Capt. ( Low & Slow ) Made a few in the 3 myself. Video is very calming and peaceful. The geese resemble foam on shallow wave's. Always looking forward. Merry Christmas, Juan and Family !
Yeah. Those questions were asked by people who did not know much about concrete. But that's ok, if you don't know? Ask. As a building maintenance bloke, I can say you try to have as few cracks in concrete as you possibly can. Something you try to control with re-bar and slowing the cooling as much as you can. Also it's worth remembering cracks are often quite dynamic. So don't expect them to stay the same. Especially in a poor that is probably still cooling (and therefore shrinking). I don't recall how thick the pour is? But I imagine it's more than a few meters, which will take quite some months to cool and cure fully(depending on the chemistry they have used). It's also worth remembering that the US is famous for occasionally being half arsed in it's construction quality in an effort to save $$$. So don't be too hard on the folks asking the questions Juan? Wonderful footage from the Mighty Luscombe.. ..all those geese. WOW.
Thanks for the informative update "Blacolirio", haven't moved yet because of the MSM reporting of the "cracks". Keeping an eye on everything from down here in the City of Oroville , keep up the good work......
re Corrosion of the rebar, the upper layers are epoxy coated for corrosion protection. You can see it in many of the DWR videos...for example august 8th at about 1:40...the green coating is epoxy coating.
Great Video of "The Geese Migration"!!!! And Great Little Crack Rant to go with the Low Dam Water Green Spot: Juan !!!! Now I just wonder what the Woodstock View from the Mighty Luscom would be from a Christmas Tree Farm? Tis the Season & Happy Christmas Tree Hunting Juan. Thanks for another amazing DWR & Keiwit Update.
Love to go flying in the Mighty Luskom, and it was a great ride today! It's a shameful state of affairs at GoogleTube. I will be donating. Thanks, Juan.
Thanks Juan, another perfect try to explain reality to people with scientific ignorance. I think these people are resitant to those correct explanations, but at least the truth is out, and the rest of us are updated and approved.
Juan. Someone may have already said this in these comments, but if not here it is. I saw another RUclips creator who did a video on this topic. The solution was to post the new video as private and request review. Once it has been checked by them then you make it public. Downside is videos would be several days delayed for public viewing. Sorry if this has been said already... just didn't feel like checking through all the comments to see. Great videos. Keep it up! Brian
thanks for the continued coverage Juan. i live in Indiana, but cant get enough info concerning oroville dam. i'm fascinated by this whole ordeal. ps, great landing. you have inspired me to take up flying lessons come spring.
While I am not surprised to see shrinkage cracks in the concrete, there are normally control joints placed periodically in the concrete to direct the cracking. I don't recall anyone saying whether the cracks were in the slab or in the sidewalls. If the walls and slabs were not poured monolithically, there shouldn't be any correlation between cracks in each. I assume that the shrinkage cracks are in the poured concrete and not in the roller compacted concrete. I would be interested to know if any cracking has been observed in the roller compacted concrete. The dryer mix and compaction tend to minimize shrinkage. Even so, with such a long structure, some cracking could be expected.
I only got to 14:00 before I had to pause it to say that the music and video of the geese flying opposite your flight path was dare I say, stunning. What a beautiful view on a late Autumn day! And once again the ahem, media, proves their lack of intelligence and agenda to create trouble where there is none. Thanks for your level headed and objective reporting. You rock!
After you said "...the folks at Public Radio don't have a fundamental understanding....", you could have ended the video, and the majority of the population familiar with Public Radio would have given this video a "thumb-up". I often watch clips that PBS posts on YT, and have yet to watch one that espouses any perspective to the "right" of Bernie Sanders.
I have been watching your Oroville coverage here in NY from the beginning of the event. Yours was the best, comprehensive of all. PATREON is the site to being broadcasting on.... Others who are being censored like you . Are moving over to PATREON.COM , and we the people are following you........ Thumbs up to your great information, and all the time you put into it.... Thank you !
OUTSTANDING: Thank U for the explanation about the cracks, because some of the explanations we've been getting have been really cracking me up no pun intended. 🐢🇺🇸🐢🇺🇸🐢🇺🇸. Thank U also for the RUclips explanation. I watch several gun channels and they're getting the shaft.
AAahh...Chico Ranchero! I used to live in the dorms right down the street from this secret little airport hidden out in the orchards. Never landed there myself. About fell outta my chair when I saw that at the end of this post. Thanks Juan!
it is like any floor of large dimensions....no matter how well one controls the pour mix and curing procedures it will crack....however...this is not just any floor...this is a spillway and water runs down this " floor " at high speed and pressures....spalding may occur at the crack interfaces.....which is why i kind of felt the answer was to install more diverters to break the velocity of that water as it moved down the chute......
I worked on the Skye bridges first inspection,,, when it had be in use for 7 years. We found 2000 hairline cracks... it’s now 15 years later.... it’s still there. Cheers JB👍
Sorry, did someone rattle your cage? It’s ok, go back to sleep. Sorry, have you spent 20 years doing plenty of building inspections like I have? Sorry, but the spillway is hardly ever to be used, but the Skye bridge is in constant use, and gets constantly HAMMERED by the weather. Some crazy weather, huge storms, extremes of temperatures 100 mph winds.... Your comment is not even remotely relevant 😉
I'm wondering how much erosion there will be where they have created access to the spillway area, especially on the dam side of the spillway. Are there any concerns with that Juan?
Concrete curing is a chemical reaction where all the ingredients mixed together change to become 1 final piece (like when you mix all of the ingredients for cake batter and once it is don't then you have one consistent cake). This reaction process releases heat that must be managed for proper curing and the process also causes slight shrinking (the more concrete in one area the larger the amount of shrink it will have)
Juan,
Your stellar example of online citizen journalism is a high bar set at a time of great disruption within and without historical media. With your tools, skills and command pilot calm, you show us the way ahead toward larger truths. Steady as she goes, my Captain!
God Bless,
Br. David. :{D}
I spent 9 years in the redi-mix concrete business mostly in QC and sales. We had a saying ''ice cream melts and concrete crack!'' That's what it does when water hydrates and you lose volume and the mud shrinks up because the water looses volume in a particular space. Just like a drying river bottom. Your reporting is stellar as always Juan!
Thanks Juan for another comprehensive clarification and 'to the point' report. Would not miss one after all these months since the beginning of the failure.
This ladies and gentleman is exactly why press and media stories need to be taken with a serious pinch of salt. Then again "hundreds of new cracks in repaired dam" probably sells papers better than "ultra high strength concrete guarantees long spill way life span and great long term value for the stake holders"
Adam Edward yes, salt. It's always mind blowing when one has first hand knowledge if an event or topic and then sees wildly inaccurate news reports. Even NPR is guilty sometimes.
Tommy Petraglia who is Ron Brown?
unfortunately he was the new governor of california u haven,t had good governor since arnold shwart
You must remember that Google is a poor company and it is expensive to start up a new television company and you are just the people who made RUclips a success. Now Google don’t need you anymore. Thank you for sharing your amazing video, you have made Oroville understandable for us living outside USA
Carsten Andersen Excellent point!
It's just that RUclips figured they could quietly pull money away from a lot of individual creators without much of a public outcry because creators are only small voices instead of one massive representative voice that YT would be forced to reckon with. Financially hurt creators will eventually find a more equitable and fair platform...
I think he forgot to use the sarcasm font.
On a separate note Pulizer nominations are open during December
Juan, I had a garage poured 10 yrs ago. I asked about a guarantee of it not cracking, the guy say's to me, "There's 2 kind slabs, cracked ones, and ones that are going to crack".
Eastern Woods :
Funny the CBS Sacramento channel on youtube people are saying go see the Jaun/Blancolirio channel for the correct comments. Go Juan.
Thank you Juan for the mighty Luscombe views of the Oroville spillway rebuild and emergency spillway re-engineer and rebuild. Please always include shots of the *green spot* to welcome it's return (as usual) as a rain fed phenomenon.
Thanks for another great and informative video, we all really appreciate your telling it like it really is.
Also, I seem to be one of the many who hadn't understood how the RUclips policy worked, this helps. A lot of people don't realize how much work and expense is involved in these "free" videos we all enjoy. Seeing RUclips and various "pirates" trying to hijack all the cream of the top is very frustrating. Please don't give up, you're doing a fantastic job!
It really is tedious how the MSM try to aggravate.Thanks for the sensible update Juan.
Really appreciate your updates, bro. I'm a fifth gen native CAian, but now living in midwest. Thanks so so much.
Hairline cracks? That's why God made rebar. Can get bigger than hairline, depends on the soil. Re-bar is powerful tensil strength. Concrete has zero tensil strength. Rebar properly engineered to any structure, will simply not stretch without further specific design objectives. Was in residential, light commercial construction guy in Sacto Valley for over ten years. We know that back in 60s, engineers often speced too light on the rebar. Not so for past 75 years. Tensil strength keeps concrete structure from stretching forces. Concrete's virture is i its compressive strength. Forces which would compress the structure are resisted by the concrete. Perfect combo, not to worry folks.
It’s amazing how main stream media try’s so hard to make a little thing into something huge. I’m glad you post these conferences for us to see how poor the media’s perspective is. I haven’t poured a lot, maybe a 1000 yards of concrete, but every slab had an insignificant crack or two in it.
Really enjoy your landings at end of your videos. Some of them look quite a challenge with winds like you get in your area,and summertime issues with heat and DA. Nice flying Juan much appreciated skills......... Jay
Great Cross Examination of the MSM dolts, Juan. I poured a 14 X 18 concrete woodshop floor this past June. Thickened edges and rebar in the field. I kept it sprayed down with a mist of water for almost 3 months (overkill). Even then I recorded the beautiful spider-web like micro cracks in this woodshop floor. But the water I used, and the mats and water the contractors at Oroville used cured the beautiful concrete just as DESIGNED.
Engineering is a beautiful craft!
Hey Juan, another excellent and very informative video. It's appalling the way the shrinkage cracking has been misrepresented and you have done a great job of explaining it.
Hi. Great series on this project. Pity there are people who have NO CLUE what they are talking about and are just reading a question from a piece of paper for rating purposes. Generally speaking the only time they have had any contact with concrete is when they walked on it somewhere. Keep up the good work providing the world with sensible balanced reporting.
I remember one of your videos showing sheeting covering the new pours to keep the cure rate of the concrete consistent through and though. This keeps expansion and contraction uniform so that serious structural faults do not occur. Is this in reference to insignificant surface cracks, or, are these cracks going all the way through? There are test cylinders poured from every batch of concrete on every construction project I have seen to test the compression strength. When a bridge project is done in our state with concrete, these cylinders are compression tested to the point of failure to see the concrete has hardened enough for quality assurance. If compression testing fails to produce the desired results, the contractor has to do it over. I can't even imagine that they do not have certified test results from every batch of concrete that was poured on this project.
Love you for not whiping out the white board! :-) Greetings from Germany
Juan, I retired from the fire service, TVF&R surrounding Portland Oregon and while part of that organization I was a team leader on the technical rescue team and part of our structural collapse rescue training involved penetrating and/or moving concrete to rescue victims. I recall clearly a comment by one of our instructors when being trained on properties of the material and that comment regarding the subject of this video was, "It ain't concrete if it doesn't have cracks". After laughter by the class he went on to explain exactly what you are talking about. All concrete has cracks to some degree or another and that process continues throughout the concretes life, at least, that is my understanding.
I'm watching the "no bull-schatt real news channel."
Excellent reporting as usual, Juan.
Yup, YT biting the hand that feeds it! Great video Juan, I really enjoyed the view from up top, beautiful place you've got there. Love from Scotland UK.
Thank you...I needed a Green Spot update...I was really jonesing for GS information. BTW. Cracks in concrete are normally minimized by putting in control joints. The spillway can't have control joints in it because it has to be a uniform, uninterrupted, planar surface. Since you have no control joints, the surface of the concrete will crack, nothing out of the ordinary.
Brilliant documentary as always Juan, nice to see the mainstream media behaving to type; any distortion to create hype. I love the presentations you create, it's wonderfully natural and the added issues like the geese over the rice fields that shows more of life in your part of the USA. The posts on your site provide such a rich view of the true lives of Americans. Long may you keep it up please.
Great reporting as usual, Juan. It looks like the new spillway has typical concrete shrinkage cracking going on and I think you did a great job explaining that. Yes, concrete can be poured with no resulting cracking at all. We poured a 12 inch structural slab on bay mud near San Francisco a year ago and there is not one crack in the slab. But the mix was astronomically expensive and the only reason it was used was to create a cosmetic result for the high end custom home placed atop the slab. The sort of expense on this particular slab is not warranted on a utilitarian spill way. We want successful function at the dam and don't care about the level of cosmetics resulting from a very expensive concrete mix and finish process. God knows this disaster cost enough as it is and I do wonder how the State of California will find the funds to pay for all the other many infrastructure emergency fixes that will be coming down the road resulting from the lack up upkeep along the entire water project. It is a shame that we have to address fear mongering from people who seem to just want to make trouble when we have some real problems that need to be addressed and that are not even being discussed. Keep up the good work, Juan!
Juan thank you for your level headed non conspiracy reporting. Common sense in people is a rare thing this days. Again thank you.
Yes sir! I’m a swimmer Pool contract and the first meeting I have with a client I’m 100% sure they understand they during the curing phase there is going to be surface cracking of the pool shell . Scares some people off but it’s just the natural of the beast .
Thank you for your love of the North State, your massive intellectual understanding of building, flying and the other topics you address - your discussion about the winds and other aspects of what brings rains, etc. I hope you continue through the years for we all learn and benefit from everything you put out here.
Splendid stuff! Well done, Juan. Greetings from the UK.
Thank you for your objective reporting, it is nice to hear someone speaking with a clear understanding of technology and risk.
JUAN, Twenty years ago I ceased listening to mainstream NPR. I value my time and intelligence. Greetings from Catskill Mountains, NY.
Wonder what it was that signaled so many 20 years ago to leave NPR. I did too, and know of several others.
National Propaganda Radio
DM I thought Trump would have defunded npr by now. It’s bullshit that we all support NPR even though half or more of the “public” can’t stand that biased leftist propaganda garbage.
Whens the last time ANY government program was shut down? Does not matter if they are R or D's, they won't kill a program, and even when they say they cut the budget, they don't really cut the budget they just lower the proposed budget increase, and to them that is a cut. The whole government is out of control with their spending, and they don't seem to give a damn.
Do you listen to any other radio now? What RUclips channels do you like for news? One reason I like Juan's videos so much is that he doesn't poke any of my political sore spots!
Wow! You've been a busy boy Juan. I'm impressed that you not only covered all of the recent concerns with hairline cracks and green spots, but also delved into some concerns that I've had for a while, namely how they're going to handle the water table below the emergency spillway, and beefing up the ogee weir at the parking lot. You even managed to get in a video of your first love,,,,the bike! I hope AA,s flight crew scheduling problems don't keep you and your family from enjoying a great holiday .
Brilliant structured report Juan - to heck with the MSM - we'll stick with you! :)
Thank you.
Thanks for the great reporting Juan, I have been following the Dam's rebuild since February. You do have to deal with some strange people (Berkeley) Keep it up. We are in Sydney Australia.
Got lucky in feb. and happened to stumble onto your RUclips channel after the dam incident . I finally found someone who knows how to report the news . I am a water operator in San Luis Obispo and very interested on your topics about Orville . I donated to your PayPal account and know it was money well spent . We all should share our gratitude towards your efforts . Please keep up the great work .
Thanks Martin!
Where has NPR been all of this time? Have they been reporting on this in the past or is this their first time to cover this disaster-turned amazing feat that has happened in the past year. Thanks to you Juan for such great personal reporting on all of this. I always look forward to hearing your reports!
Juan, I’m doing a current events write up for one of my high school classes about Oroville Dam and I gave you a shout out for doing a great job at simplifying all of the complicated things that DWR have put out, so I thought that you would like to know that I quoted you in a government class of mine.
Excellent! Thanks Dane
Thanks again, Juan. That reporter you opened up with sure needs an education.
Wishing you and your family a very Merry Christmas.
Thank you for choosing to be a balanced truthful reporter
Jaun..I love this news speaker pushing the issue of concrete cracks..all cons will crack
Great, thank you Juan for the really factual update. Maybe we should make it a point to wait a few days to watch your videos that way you might get your payments.
Thanks for the update. I appreciate your coverage and efforts.
And the main stream media doesn't understand why people don't trust them.
Thank you Juan for the excellent coverage.
Sounds like some people don't have a concrete understanding of what's going on here.
Like you said, the people going around screaming about the cracks have never laid a foot of concrete before. Kinda like mud drying, it cracks. Top surface cures a lot quicker than concrete deeper. Always love your videos/updates! Enjoy your holiday season buddy =)
Thank you again for your time and effort to bring us these videos. God bless you and I hope you and your family have a wonderful Holidays and Merry Christmas.
Amen to that for Juan and family! Have a happy and safe holiday season and Merry Christmas to you and your family Juan! You have a great family. This from a father of six and grandfather to seven now.
I've worked with and around concrete my whole life,it always cracks. The bond to the rebar and other reinforcements is what's important . Npr? not pro reality. Great video Juan!
Hi Juan, long time no see! I saw signs for Oroville when I went to Quartzite, AZ in Jan.; however, I was in a hurry so didn't get to check out the dam. As usual, you give a concise explanation about what is going on with the dam on a level someone with no engineering knowledge can understand. I really appreciate it. More than anything, I'm SO RELIEVED that dam didn't fail altogether! Nice to hear your voice and see you so elegantly and clearly explain current events surrounding the Oroville Dam! Take Care
Thanks Kathryn!
Juan, it is so nice not to listen to a reporter's personal opinion on the subject they are reporting on. I raise my cup to you sir. Thank you for doing what a good correspondent is truly expected, reporting the facts. Thank you once again.
Juan, I am pleased contribute to your reporting of the
Oroville dam and other subjects that you are interested in through PayPal. Your
link included in the description made it simple and I hope others will do the
same. As a columnist to our local paper I appreciate informative and truthful
reporting and have followed your videos for months. Keep up the good work Juan
and I look forward to your future reporting whatever that should be. - Canada
Once again, a professional, informative video. Love the goose flight interlude! Beautiful to watch and appropriate music. Thanks so much Juan for your hard work. Just don’t enjoy yourself so much in the mighty Luscomb. Remember it’s supposed to look like you’re working.
Great to see you again Juan and hear your soothing voice...watch from the passenger side as you fly over Oroville and God's green earth, love the new music - you've got quite the production team inside your own family.
I spent a few minutes listening to and watching other u tube videos - O M G ! - one from Perth, Australia was abyssmal.
I understand it's harder now for great content like yours ( thanks for the simple explanation ), but be glad the other videos have to face the same scrutiny. Quality content will win out and to do my part - here's a little something to help you over the hump.
Thanks Richard!!
Juan, that was good info about the ads. I had no idea. I will be sure to wait a few days after I'm notified of one of your videos before I watch it.
The view of the snow geese was beautiful! Thanks for sharing that.
Thank you Juan , I have said this before and I will say it again , Without you we would have no idea what is going on there !
I've said it before, the green spot is caused by water runoff from Kelly Ridge. When the soil is saturated the water from Kelly Ridge will runoff onto the dam, during the middle of summer the soil is not saturated and the water will soak into it and the green spot will dry up. The soil is now saturated with water and the green spot has returned. The same thing happens on any hillside below a large community when you have dry summers and wet winters.
Thanks for keeping it Real and no Filler!
I am curious if it would have been better and cheaper to just build a secondary spillway for the emergency overflow case. Everything below the secant cut off wall will be chaos and that trash will all end up back in the river requiring the power plant to shut down and requiring another cleanup. As large an area as that overtopping emergency spillway covers it seems they could have built a standard spillway clear to the river with the same materials.
Just would like to let you know I really enjoy your videos especially the Oroville updates. Thanks again...
Juan. Sometime in the last 2 weeks I was unsubscribed from your channel.... Not my doing... I'm subscribed with the notifications again. (I haven't "lost" any of my 71 subscribers. yet....)
Great job again.
Another well-informed technical contribution, Juan.
The hardening process in concrete combines the drying shrinkage property of the cement and the build-up of heat in the mass as a consequence of the exothermic reaction and cracks are inevitable, particularly in a continuous RC structure such as a spillway. Codes of practice provide various ways to minimise cracking and, in RC, the aim is to restrict cracks to hairline width, say, less than 0.3mm, if at all possible, to limit the ingress of moisture and oxygen which could eventually cause corrosion of the reinforcement. But, in any case, the alkali environment provided by the concrete will prevent corrosion of the reinforcement anyway.
I spend my professional life inspecting cracks in buildings, in London, usually as a consequence of a comment in a building survey report. My Twitter handle was originally @Crackoholic but my kids, who’s Street cred is better than mine, advised me this was not a good idea! There is this general misconception also that buildings should not show cracks but it is actually quite normal and we just redecorate on a cyclic basis. The important distinction is between non-structural (cosmetic) and structural cracks that may impair the integrity of the building. Timber is a material that eases and adjusts itself on a seasonal cyclic basis which causes cosmetic cracking in typical locations within buildings. Given the amount of timber used in low-rise buildings on your side of the pond I anticipate that visible cracks are a common feature over there too.
So, if the cracks at Oroville are as you have described then the project engineers have done a fine job.
Howard!
You said it yourself "to restrict cracks to hairline width, say, less than 0.3mm" and that is correct. Juan said the cracks are half the width of a fingernail. My fingernail is 10mm making the cracks 5.mm. That is enormous and the concrete is still curing. Do you know what will happen when the temp drops below freezing. It will take a few years but the spillway WILL FAIL PERIOD.
Jerry Antonetti spotted what they did wrong and they did it wrong because Calif hires depending on who you know NOT what you know. Viva la New Bay Bridge
phillip kalaveras if your fingernails are 10mm thick then you need to see a doctor!!!
Hi Juan, Thank you for presenting something to really feel connected to, I sincerely appreciate your Work, and especially your grounded baseline, i am sure you´ll get what i mean, thanks! keep it up, i´ll be watching!!
Excellent presentation and explanation, Juan. Keep up the great work (and fly safe).
Nice grass side touch down. Late fall, early winter flying is the "best".
I have placed quite a bit of concrete. I have also cut countless expansion joints. Expansion joints give a place for the concrete to crack.
Great job Juan as always .
The geese over the rice fields looked like flowing, splashing water. Beautiful.
Really enjoy your professional approach to the news. When you give up flying you have a great full time career as a news outlet.
So I will just what a few days to see your videos from now on or until you tell us it ok to see them when they first come out. keep up the grate work .!!!!!!
Nice "DC3" approach, Capt. ( Low & Slow )
Made a few in the 3 myself.
Video is very calming and peaceful. The geese resemble foam on shallow wave's.
Always looking forward.
Merry Christmas, Juan and Family !
Yeah. Those questions were asked by people who did not know much about concrete. But that's ok, if you don't know? Ask.
As a building maintenance bloke, I can say you try to have as few cracks in concrete as you possibly can. Something you try to control with re-bar and slowing the cooling as much as you can.
Also it's worth remembering cracks are often quite dynamic. So don't expect them to stay the same. Especially in a poor that is probably still cooling (and therefore shrinking). I don't recall how thick the pour is? But I imagine it's more than a few meters, which will take quite some months to cool and cure fully(depending on the chemistry they have used).
It's also worth remembering that the US is famous for occasionally being half arsed in it's construction quality in an effort to save $$$. So don't be too hard on the folks asking the questions Juan?
Wonderful footage from the Mighty Luscombe.. ..all those geese. WOW.
thankyou for the flight juan......beautiful views
Thanks for the informative update "Blacolirio", haven't moved yet because of the MSM reporting of the "cracks". Keeping an eye on everything from down here in the City of Oroville , keep up the good work......
re Corrosion of the rebar, the upper layers are epoxy coated for corrosion protection. You can see it in many of the DWR videos...for example august 8th at about 1:40...the green coating is epoxy coating.
Great Video of "The Geese Migration"!!!! And Great Little Crack Rant to go with the Low Dam Water Green Spot: Juan !!!! Now I just wonder what the Woodstock View from the Mighty Luscom would be from a Christmas Tree Farm? Tis the Season & Happy Christmas Tree Hunting Juan. Thanks for another amazing DWR & Keiwit Update.
Love to go flying in the Mighty Luskom, and it was a great ride today! It's a shameful state of affairs at GoogleTube. I will be donating. Thanks, Juan.
Well said thanks for the update Juan.
the Spillway King......................thank you for the post Sir....
Thanks Juan, another perfect try to explain reality to people with scientific ignorance. I think these people are resitant to those correct explanations, but at least the truth is out, and the rest of us are updated and approved.
Juan. Someone may have already said this in these comments, but if not here it is. I saw another RUclips creator who did a video on this topic. The solution was to post the new video as private and request review. Once it has been checked by them then you make it public. Downside is videos would be several days delayed for public viewing. Sorry if this has been said already... just didn't feel like checking through all the comments to see. Great videos. Keep it up! Brian
thanks for the continued coverage Juan. i live in Indiana, but cant get enough info concerning oroville dam. i'm fascinated by this whole ordeal. ps, great landing. you have inspired me to take up flying lessons come spring.
While I am not surprised to see shrinkage cracks in the concrete, there are normally control joints placed periodically in the concrete to direct the cracking. I don't recall anyone saying whether the cracks were in the slab or in the sidewalls. If the walls and slabs were not poured monolithically, there shouldn't be any correlation between cracks in each. I assume that the shrinkage cracks are in the poured concrete and not in the roller compacted concrete. I would be interested to know if any cracking has been observed in the roller compacted concrete. The dryer mix and compaction tend to minimize shrinkage. Even so, with such a long structure, some cracking could be expected.
Thank you for the update, you do a great job!
Love the first white board.
I only got to 14:00 before I had to pause it to say that the music and video of the geese flying opposite your flight path was dare I say, stunning. What a beautiful view on a late Autumn day! And once again the ahem, media, proves their lack of intelligence and agenda to create trouble where there is none. Thanks for your level headed and objective reporting. You rock!
Good work Juan. Thanks for your patience in explaining. Who knew this stuff was so complicated? Ignorance run wild. :D
Rebar close to concrete surfaces (when poured) create visible cracks on surfaces which causes rusting of rebar and further bigger expanding cracks.
Someone in Walmart's purchasing department had it right... Rope, Tree, Journalist. But not you, Juan. You're one of the good guys.
thank you so much for the emergency spillway update and explanation. cool dino behind you on the rail.
After you said "...the folks at Public Radio don't have a fundamental understanding....", you could have ended the video, and the majority of the population familiar with Public Radio would have given this video a "thumb-up". I often watch clips that PBS posts on YT, and have yet to watch one that espouses any perspective to the "right" of Bernie Sanders.
I have been watching your Oroville coverage here in NY from the beginning of the event. Yours was the best, comprehensive of all.
PATREON is the site to being broadcasting on.... Others who are being censored like you . Are moving over to PATREON.COM , and we the people are following you........ Thumbs up to your great information, and all the time you put into it.... Thank you !
OUTSTANDING: Thank U for the explanation about the cracks, because some of the explanations we've been getting have been really cracking me up no pun intended. 🐢🇺🇸🐢🇺🇸🐢🇺🇸. Thank U also for the RUclips explanation. I watch several gun channels and they're getting the shaft.
It's another excellent update Mr. Browne . best regards .
It is hard to listen to those idiots in the mainstream press... Thanks Juan for doing your part to keep people informed.
AAahh...Chico Ranchero! I used to live in the dorms right down the street from this secret little airport hidden out in the orchards. Never landed there myself. About fell outta my chair when I saw that at the end of this post. Thanks Juan!
it is like any floor of large dimensions....no matter how well one controls the pour mix and curing procedures it will crack....however...this is not just any floor...this is a spillway and water runs down this " floor " at high speed and pressures....spalding may occur at the crack interfaces.....which is why i kind of felt the answer was to install more diverters to break the velocity of that water as it moved down the chute......
Thank you for bringing clarity. I had a feeling the mainstream interpretation of this was a bit skewed.
I don't think I've ever seen that many geese in my life.
As always, a good and very informative video.
Nice to know. I have to wait couple of days before I watch your new interesting video.
I worked on the Skye bridges first inspection,,, when it had be in use for 7 years. We found 2000 hairline cracks... it’s now 15 years later.... it’s still there. Cheers JB👍
Sorry, did someone rattle your cage? It’s ok, go back to sleep. Sorry, have you spent 20 years doing plenty of building inspections like I have? Sorry, but the spillway is hardly ever to be used, but the Skye bridge is in constant use, and gets constantly HAMMERED by the weather. Some crazy weather, huge storms, extremes of temperatures 100 mph winds.... Your comment is not even remotely relevant 😉
Excellent as usual! Thank you Juan.
I'm wondering how much erosion there will be where they have created access to the spillway area, especially on the dam side of the spillway. Are there any concerns with that Juan?
Concrete curing is a chemical reaction where all the ingredients mixed together change to become 1 final piece (like when you mix all of the ingredients for cake batter and once it is don't then you have one consistent cake). This reaction process releases heat that must be managed for proper curing and the process also causes slight shrinking (the more concrete in one area the larger the amount of shrink it will have)