Posted by Billy NY on January 06, 2020 at 07:21:02 from (74.70.87.149):
In Reply to: Re: Driveway culvert posted by Dave41A on January 05, 2020 at 18:09:25:
Some confusion here, clean crushed stone will not compact, no range of different aggregate sizes within it. Gravel without too much really large aggregate, crushed stone, crusher run, whatever they call it where you are with the array of aggregate sieve sizes from fines to say 3/4" at optimum moisture content will compact sufficiently.
What showcrop is talking about is filling the depth of the hole in increments, say 12" lifts, compacting and an inspector would test each lift with a device such as a Troxler nuclear density meter.
If you have decent gravel or crushed stone material, and there is no other issue, placing and compacting with various means should make the difference. What retains the cover over the pipe one the ends, is it stable or not retained, sloped at correct angle of repose is the only thing I can think of unless the subgrade under the pipe is unstable, and I have seen that happen with sanitary sewer lines. Some variables to consider, but nothing complicated with the right material and say a plate compactor or even running over with the tires of a tractor, just do so in smaller lifts if need be.
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