Thank you Sir......these lab experiment are very useful for me to understand during covid -19 because in this situation our colleges are going completely online so these videos are very helpful for students.......... again thank you so much sir.....
Very professional and well explained. Very compliant to the regulation. Yet, let me give you a precise tip: the first done, with the mold and the hammer, actually is not the CBR, but the Proctor test. The CBR is the last, done with the assistant. The two tests are strictly related (CBR is gonna be executed after the proctor) but they are two different test. The proctor test is aimed to evaluate the optimum, i.e. the maximum amount of water (weight %) to have the max density. Indeed, until a certain value (depending on the kinda soil), water furthers the bonds between the grains and, hence, the density, becouse of the water film between. But over a certain value, water is too much and it tends to counteract the density, making the grains submerged into water. Like all the other lab geotech. tests, this one also requires several tests; for each test the soil must be weighed, subtracting the weight of the mold (previously weighed void) and the weight of water (knowing its amount in each test) to find the net dry weight. All the results are plotted in the optimum bell curve, built step by step (water content % vs dry density in the diagram) and compared them each other, to see which one is at the top of the curve (the content of water, called optimum indeed, that gives the most performing soil).
Proctor test is usually done in a smaller mould. Without any spacer disc. Though anything is fine. And for CBR we have to prepare the sample and therefore the first is definitely part of the CBR TEST
Beautifully explained the CBR test. Great job Ajay sir! Also, i would like to tell NCTEL to make a correction in the video. 4:42 - Dynamic compaction table, the no. of blows in heavy compaction should be 75 (it is written 56).
hi sir thank you for uploading video for learning. can u explain me where we can use 3 layer comaction and where for 5 layer compaction methods and how would we analyse its loose dense soil and high dense soils
First of all thank you for such clear explanation, i am here to know ans for my question, 1) how we differentiate casting of specimen at 95℅ compaction(as per MORTH), 97% compaction(as per IRS) or 100% compaction of MDD for blanket layer. 2) how setting load applied, and how much it is on dial gauge reading, Please replied it i really want to know this.
100 % compaction is not practicable at site due to less control on moisture content and other variables. So as per specified requirements compact to desired degree .
Most of the people doesn't know why 2.5 mm value is considered it is actually 1 inch according to American standard test procedure and the rock used was of 1 pound weight and it was found generally in california....
Video at 4:27 says heavy compaction of 75 blows for each layer in 5 layers. But the table shows only 56 blows. Only legend will understand. I did mot get convinced😢
please define the no. of blows for 97 % compaction 10, 30, 65 for the cbr casting, because required no. of blows as per ASTM D1883 (10, 25, 56 blows) compaction for 95% (how to calculate 10, 30, 65 blows for 97% compaction or where are write this criteria.)
I graduated this year in my first bachelor degree in geological engineering, so if there is some one that can tell me about the scholarships let me know? Thank you.
If initial portion of your graph is curved inwards it requires correction...you can simply draw a tangent for that portion of the graph and check where the tangent meets at your X axis, that's your new 0
It is always India who saves me with college. Love you india from netherlands
Same here brother 😊
Buy the way I am from India.
Way of explaining about CBR test was really excellent and easy to understand.
Thank you sir.
Ur patience during explanation is superb, thanks a lot Sir🙏
The basic objective was develop understanding. A few people find the pace of it to be slow in modern times .
This video is very usefull for quality lab engineers .... Thanks a lot sir for uploading such a good topic video
We are working in QC lab
This video was really helpful
Thankyou so much creators 🙏🏻
Thank you Sir......these lab experiment are very useful for me to understand during covid -19 because in this situation our colleges are going completely online so these videos are very helpful for students.......... again thank you so much sir.....
Happy to hear that.
thank you so much. this video helped me to understand CBR test easily. well explained.
I didnt understand it properly...can you please
Love u sir. U olws helps us a lot. Salute to ur grt work n efficiency 💕
Thanks ! Happy to hear that.
thanks for your appreciation !
Thank you so much sir. These videos are helping me a lot .
really useful and awesome presentation..thank you sir
Thank you so much Mr. Ajay for the great presentation of the CBR test
Very nice demonstration with clear explanation....👏👏👍💐
Very professional and well explained. Very compliant to the regulation. Yet, let me give you a precise tip: the first done, with the mold and the hammer, actually is not the CBR, but the Proctor test. The CBR is the last, done with the assistant. The two tests are strictly related (CBR is gonna be executed after the proctor) but they are two different test. The proctor test is aimed to evaluate the optimum, i.e. the maximum amount of water (weight %) to have the max density. Indeed, until a certain value (depending on the kinda soil), water furthers the bonds between the grains and, hence, the density, becouse of the water film between. But over a certain value, water is too much and it tends to counteract the density, making the grains submerged into water. Like all the other lab geotech. tests, this one also requires several tests; for each test the soil must be weighed, subtracting the weight of the mold (previously weighed void) and the weight of water (knowing its amount in each test) to find the net dry weight. All the results are plotted in the optimum bell curve, built step by step (water content % vs dry density in the diagram) and compared them each other, to see which one is at the top of the curve (the content of water, called optimum indeed, that gives the most performing soil).
@@erkamkurt3127 I read @Umberto Bombace comment. He is absolutely correct.😀
@@erkamkurt3127 I read the comment well and he is correct.
Proctor test is usually done in a smaller mould. Without any spacer disc. Though anything is fine.
And for CBR we have to prepare the sample and therefore the first is definitely part of the CBR TEST
I like this well explained thanks
Really a nice explanation made all doubts cleared.
That was awesome MR.Ajay , Thank you a lot sir for this simple and clear explanation.
very nice explain congratulations Ajay sir 👍👍👍👍
Thank you sir, the tutorial is very useful.
I wonder where the standard load value comes from sir?
Great job sir. Well explained
Sir, beautifully explained video. Clearly detailed out. Great job.
thanks
thank you NCTEL you upload very effective videos.
thank you
Very detailed and clearly explained
Thanks a lot Sir
Very Helpful! Thank you!!
BEST VIDEOS FOR CIVIL ENGINEERING.
Wonderful and very detailed presentation, thank you sir 🙌🏿🙏🏿
Thanks
Nice explanations...good job.
That was quite detailed. Thank you
Beautifully explained the CBR test. Great job Ajay sir!
Also, i would like to tell NCTEL to make a correction in the video.
4:42 - Dynamic compaction table, the no. of blows in heavy compaction should be 75 (it is written 56).
75 blows are given in Marshall Test . This test requires 56.
This test req 56 only
Very well explained.! Thanks sir
Very nice explanation.
Thank you very much.
Beautifully explained sir
As per IS 2720 PART 16 - 1987 St. Load at 2.5 mm penetration is 1370 kgf. Thank u for the video sir.
Superliked cbr test nice sir very good thankyou
So what was the CBR for this example? Good video, but the most important part was not given.
Very greatly explained sir...
Thanks Thanks Thanks sir 🙏
🙂
Happy to know that
Please upload heavy compaction of CBR test of soil
Everything cleared, very nice video
hi sir thank you for uploading video for learning. can u explain me where we can use 3 layer comaction and where for 5 layer compaction methods and how would we analyse its loose dense soil and high dense soils
Thank you very much. well explained
Great job sir
Nice explanation....thanks a lot....sir...
very nice explaination sir
Thank u sir for the details of the CBR test.
how to calculate total load from unit load? multiply with area of plunger?
First of all thank you for such clear explanation, i am here to know ans for my question,
1) how we differentiate casting of specimen at 95℅ compaction(as per MORTH), 97% compaction(as per IRS) or 100% compaction of MDD for blanket layer.
2) how setting load applied, and how much it is on dial gauge reading,
Please replied it i really want to know this.
100 % compaction is not practicable at site due to less control on moisture content and other variables. So as per specified requirements compact to desired degree .
nicely explained
very nice sir ji. tu si grate ho.
Helpfull videos thank you sir.
Very nice video sir. Very nice
Perfect explaination sir
Sir in which code 56 blow for each layer is written?
What are procedure of soaking ?
i am studying in canada but still this video was helpful, thanks Mr ajay
Happy to hear that.
So What if you are studying in Canada?
Civil Engineering is same.
Welcome!
thanks for making such awesome video
But you didnot explain about the curing period of the specimen
4 days soaking if Soaked value to be found.
What is the MINIMUM AND MAXIMUM CBR VALUE OF SUBGRADE AND GRANULAR SUB BASE
Why the CBR value at 2.5mm penetration is higher than 5mm penetration?
It's very use full sir ...satta padi ah.
Sir thanks a lot for very very nice explanation
Most of the people doesn't know why 2.5 mm value is considered it is actually 1 inch according to American standard test procedure and the rock used was of 1 pound weight and it was found generally in california....
1 inch means 25mm not 2.5mm.
Sir your smile is too good..❤🙏
thanks ! one should enjoy doing what you need to do.
How to know penetration value and how to read proving ring readings
The soil should be first sieve to 19mm and retain in 4.75mm
Where the load of standard crushed stone gone !! That is also to be determined for cbr %
Video at 4:27 says heavy compaction of 75 blows for each layer in 5 layers. But the table shows only 56 blows. Only legend will understand. I did mot get convinced😢
Kab kaun so soil Lena hai kaise pta chalega?
Thank you sir.👏😇
Wow supper explain
😂 10 saal ka baad main dakha raha hu or mujhe samjh aaa gya wow ....or ajj kal ka teacher kuch bhi 😂😊
What about 2 to 3 day soaking period .
Good explaination sir
Tq so much for this video
please define the no. of blows for 97 % compaction 10, 30, 65 for the cbr casting,
because required no. of blows as per ASTM D1883 (10, 25, 56 blows) compaction for 95%
(how to calculate 10, 30, 65 blows for 97% compaction or where are write this criteria.)
25 for light compaction and 56 for heavy .
It helps me lot sir 🥰
Sir,Very Nice
Sir u said in vedio in heavy compaction giving 75 blows and in table written 56 which is correct
56
Waah guru ji
Is there any award for this man?
Proving ring capacity which is used in CBR test
Very very nice
Tanks a lot sir🙏🙏🙏
I graduated this year in my first bachelor degree in geological engineering, so if there is some one that can tell me about the scholarships let me know?
Thank you.
and the saturation of the material before the loading test?
first you make Proctor test to know the optimal water content
nice tq
Super sir
Thank you ❤
😄🖤thank u sir 👍🏿
Plzz show the penetration value for 2.5mm,5mm settlement
How read proven ring reading, 50 KN load proven ring i div = ?
please give me a example
Supplier of proving ring gives a calibration chart . count the small divisions against the penetration .
Can anybody explain me how to draw graph for corrected load intensity?
If initial portion of your graph is curved inwards it requires correction...you can simply draw a tangent for that portion of the graph and check where the tangent meets at your X axis, that's your new 0
Kollam poli
Thanks sir
Great video sir
Thank you so much
Thanks
Sir Namaste🙏 Best initiative
Thanks
Isnt sieving required?
Sir i have one doubt.
Please show Cbr test Tabulation and calculations
thank you sir!!
Thanks you sir
What a smile sirjii
😄
Nice video
nice sir.