I think no Mechanical compactors can perform on such a small space. We only have 6 inches allowance on both sides of the pipe. I think the reason why our specification indicates the use of flooding because of the limited width of our trenches. RE: SAND AS TRENCH BACKFILL MATERIAL AND APPLICABLE COMPACTION METHOD TO BE USED PEinc (Geotechnical) 25 Oct 17 Ronġ. Flooding will not provide sufficient compaction to prevent the pipes from settling. It appears to be more of a concrete fine aggregate than a sand fill material.ĥ. Based on the size designation you give for S-1, it should be ok as long as it is compacted properly. Compact around and above the pipe to at least 98 percent of ASTM D1557 or T-180.Ĥ. It does not have to be thick.just enough to allow seating the pipe and its joints.ģ. Immediately below the pipe provide a gravel bedding. Use a direct field density method such as the drive sleeve or, if using a nuclear density gage, make appropriate trench corrections.Ģ. Field density tests should be run to verify. The soil below the pipe should be compacted to at least 95 percent of the maximum dry density as determined by ASTM D1557 or AASHTO T-180. Proper bedding of pipes, particularly below pavements is important. It makes no sense to only provide compaction above the pipe. I'm not familiar with your S-1 sand designation, but will offer a few comments about pipe trenches in general.ġ. RE: SAND AS TRENCH BACKFILL MATERIAL AND APPLICABLE COMPACTION METHOD TO BE USED Ron (Structural) 25 Oct 17 11:34 Sorry for my long querry at least I think I provided the needed details for you more experienced professionals to provide your opinions/ answers to my questions. The trenches I am referring to are situated on highway pavements subject to truck loadings (HS20 loading). How long after the application of water by flooding can you perform a Field Density Test? ![]() With the maximum dry density taken from the proctor test? Does compaction by flooding be able to achieve 95% compaction? We know that the resulting compaction is sufficient enough? Can the actual compacted density by flooding be compared Our specification allows compaction of Sand(0-6mm in size) by "flooding".Is this really suitable or efficient? How can Is the conventional procedure I mentioned in 2.a above is still applicable?ī.3.
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