Chip Seal over Full Depth Reclamation of Road Subbase
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- Опубликовано: 14 сен 2021
- Following full depth reclamation of the distressed road subbase, Cecil County (Maryland) Roads Division surfaced Carpenters Point Road with a double shot of chip seal as a pavement preservation method to extend the roadway's useful life.
This footage shows the chip seal process, including the test strips to test the "recipe". Two layers ("shots") of chip seal were applied to the soil-cement treated subbase. The emulsion was CRS-2L (a latex modified, cationic rapid setting emulsion), applied at 0.35 gal/SY. The test strip revealed that the #8 washed stone application of 13 #/SY was too heavy and subsequent treatment was backed off to 11 #/SY.
The Delaware T2/LTAP Center provides direct technical assistance, training, and technology transfer to Delaware local agencies relative to their transportation challenges.
sites.udel.edu/dct/t2-center/
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I'd like to offer a prediction that the lifespan of this road before further work needed, especially in a place that experiences cold winters.. 5 years. If you already have bumps or ruts, street plows will find them.
Could be. RoadResource.org is a great resource for looking at pavement preservation techniques and there you will see anywhere from 3-5 years up to 7-10 years, depending upon the nature and condition of the existing bed; and of, course, the quality of the materials and craftsmanship putting down the chip seal. There is a lot of science in the materials and there is a good deal of art and experience in putting it down. We have some roads locally that, with a double shot of chip seal and then slurry seal (some would call this a Cape Seal), have lasted 20 years with little distress; admittedly, low volume, low speed roads.
You are also correct on the expectations side. Chip seal will reflect the existing surface profile, so if the existing road has some challenges (not too many or perhaps you shouldn't be chip sealing), some wedge and leveling with asphalt ahead of it may be needed. But well applied chip seal should hold up to snow plows reasonably, particularly if mold board skids are used to keep the cutting edge slightly elevated.
Thanks for the comment!
Delaware sure does like to film road projects in Maryland!
Funny! Willie Sutton said because that's where the money is. We're opportunistic - if we see something worthwhile to film and we get an invite - we're there.
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Surface looks a bit bony
Why such a large lap strip. Wouldn't it be better to shoot full width of the road?
Thanks for the question, Rodney. I believe their chip spreader maxes out at 12'; might go to 14'. Regardless, they can't shoot the whole 20-22' width with one pass and they certainly want some overlap before they want a gap. The idea is to seal the road out. With the relatively small chip size and the subsequent roller action that seats the stone, they don't run much risk of building up a ridge, but it is something to watch for, particularly when you think about snow plowing.
Bearcats build 20’ chip spreaders when you do multi pass you MUST over lap no more than 6”. 3/8” chip aggregate is common when chip sealing
Your spreader operator should alway shoot on his good side to not overspray concrete driveways unless there’s center line on road.
Its to good see that the 2 guys on the chip spreader are wearing respirators breathing that shit in all the time will cause bad health problems in life .
This geriatric crew has no need to worry.
thats what they need in sydney austarlia
We'll send them over! LOL
This shit should be outlawed. Tar gets all over your vehicles if your the lucky ones to drive on it after freshly laid. Not to mention all the damage those chips do to people's cars from your tires picking them up and ruining your paint. Then there's motorcycles.
Garbage azz road... This is basic tar and rock road. That sucks and damages vehicles
Waste of taxpayer money
Not really chip seal is maintenance prevention been around since 60’ you could save typical road for another 10+ years when done right. You want to pave every road? Then get ready to spend $1M per 5 miles you could chip seal 5 miles for less then $200k
Agreed. Pavement preservation techniques like this for the right road at the right time can extend the service life at a fraction of the cost. Local agencies that use all the tools in the toolkit are the ones that are truly good consumers of the taxpayer's money.
@@p.youhana3563 Spot on. If their taxes shot up 300 percent or more then their attention would be on that. Are they getting 10 years on their seals?