Compaction test for backfilling works using sand
Compaction test for backfilling works using sand
(OP)
Is there an ASTM standard referring on this? EPC contractor preferred to use sand saying there is no standard test and visual inspection is enough. Sometimes, soil will be mixed with sand as binder and will not conduct FDT either.
There is something wrong I think. Please enlighten us.
There is something wrong I think. Please enlighten us.






RE: Compaction test for backfilling works using sand
Dik
RE: Compaction test for backfilling works using sand
One test that can be done is the Ontario Ministry of Transportation test where the volume of the field relative compaction is determined as: (1) density hole is determined by water balloon or sand cone method, (b) the soil removed is then adjusted in moisture content to "optimum" (need an experienced soil tech or engineer) and then, (c) the soil is compacted into the Proctor mold where based on the field hole volume there is a dipstick that permits the number of blows to be adjusted to give the Proctor energy. (d) The volume in the mould is then determined via a scale on the dipstick and (e) a comparison is made of the field hole volume and the Proctor volume to give the "% relative compaction". I used this method back in the 1970s - it works well but was time consuming.
Given that you will be likely doing a Proctor I would suggest that, to get a better handled on the actual relative compaction, the previous layer be tested. Due to the sand confinement issues, it is better not to test the layer you are placing but the previous layer - then, follow the progression in similar fashion until the surface. If the surface remains as "sand", the relative compaction will have little meaning after a few days in the hot sun . . .
At least, this is my take on the issue posed.
RE: Compaction test for backfilling works using sand
RE: Compaction test for backfilling works using sand