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Pipe Trench Soil Compaction-field verification

Pipe Trench Soil Compaction-field verification

Pipe Trench Soil Compaction-field verification

(OP)
If I specify that fill materials are to be compacted to 95% of the maximum dry density obtained by the Modified Proctor Test, ASTM D1557, how is this compaction verifed in the field as the work is progressing?

RE: Pipe Trench Soil Compaction-field verification

RE: Pipe Trench Soil Compaction-field verification

Although a gamma densitometer would only be used for streets and highway crossings or other similar more critical backfilling.  You shouldn't have to be using that out on the RoW 178 miles outside of Podunk.  

Let your acquaintances be many, but your advisors one in a thousand'  ...  Book of Ecclesiasticus

RE: Pipe Trench Soil Compaction-field verification

probably don't need 95% modified proctor in RoW 178 miles outside of Podunk either...
 

RE: Pipe Trench Soil Compaction-field verification

it is measured by sand replacement - make a hole, weigh the soil taken ut of the hole. Fill the hole with a known volume of sand. i.e pour out of a calibrated container.
You now have volume and weight. Dry the soil you have volume and dry weight. Calculate densities weight/volume. If you use a nuclear density meter you need to calibrate occasionally using the sand replacement method.

There are standards and standard kit available.   

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