Any issues with using gravel on top of sand while backfilling utility trenches containing PVC pipes? Would a geotex between sand/gravel be useful or is it overkill?
sand may migrate into the gravel. it also allows water to accumulate or flow through the trench. i would not use gravel for trench backfill unless you add cement
To clarify things, the reason I specified sand + gravel is because trench is crossing concrete pavement. So the trench gets filled with sand first, and then entire area gets gravel/crushed rock before the slab is poured. Slab is subject to heavy vehicular traffic (loading dock area).