We recently had a gravel material be tested by a soils lab for sieve and proctor. he sieve results classified it as "Poorly-graded gravel w/sand & silt", which does make sense once you compare the grain-size distribution. However, when they ran the proctor, they claimed they came up with an uncorrected value of 155.3 pcf. Now, I know that most engineers when designing with concrete usually take values from 145 pcf to 150 pcf. Looking at these results, I can't help but think that there may have been an error somewhere.
Has anyone ever encountered a material that the maximum dry density tests out heavier than concrete? Is this truly feasable?
Bear in mind this is 1/2" processed material, no reclaimed concrete or asphalt.
Extras: ASTM D1557 Method C for compaction. ASTM D422 for washed sieve was used.
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