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I’m trying to determine a correlation between Standard and Modiified Proctors. Best Of All, It’s Free! Eng-Tips’s functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden.
3 members like this thread! Small strip mall in silty clay over limestone and sinkholes opened during a recent 2-inch storm. I did not perform the lab work and don’t have a copy of the results yet. He wants to switch to the Standard. A basic walk thru after the 2-inch rain does not indicate any significant loss in compaction already in place. 1 member likes this post!
There is no good numerical correlation between these two methods. They impart significantly different amounts of energy to the soil for compaction in the lab. I would not expect to see as great a difference as you have noted. Usually the diffence between standard and modified values is more on the order of 3 to 5 percent.
The standard Proctor is more often specified for the material you are encountering. Review the results carefully, though. Something appears to be screwy. I will be tlaking to the GC in the morning and want to see the backup for both tests. Did ASTM renumber these test specifications?