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I recently had a testing lab use one of these for bearing capacity checks in the field. I cannot find any reference to this device. What is it? Who makes it? What is its reliability? This is being used on structural fill in central PA.

The ASTM Nos are correct according to my Vol.04.08, but its a bit old, 1993. On the original subject, I found an interesting article at www.stratageotech.com titled Engineering Fills and Compactions. They have an interesting discussion which may be ammunition for compaction under a building.

Ron....... Thanks a whole bunch.... I had heard there was a 5% difference but have never seen literature or competent discussion to back up the numbers. I will be tlaking to the GC in the morning and want to see the backup for both tests..... Thanks again.

I'm trying to determine a correlation between Standard and Modiified Proctors. Here's my problem. Small strip mall in silty clay over limestone and sinkholes opened during a recent 2-inch storm.The GC is using available material for compaction and recent moisture content hit 23%. (I did not...