95 modified compaction.
95 modified compaction.
(OP)
Does anybody have experience with a 95 modified compaction?
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RE: 95 modified compaction.
RE: 95 modified compaction.
RE: 95 modified compaction.
RE: 95 modified compaction.
Just read an interesting article from some comparisons done on Texas soil in that 100% modified proctor was found to be equal to or better than 100% relative density (as determined by the relevant ASTM specs for min and max density). Mainly on SP soils, though.
RE: 95 modified compaction.
even at 98% standard here, i've seen the subgrade look like hell under a loaded tandem axle because the upper 6" or so shear and blow out all to heck under the tire loads....the last really bad project like this i can remember had a CBR=3 (the "heavy duty" section had 6" GAB and 3" AC...wasn't my spec and i'm sure the pavements are already torn up due to construction traffic).
RE: 95 modified compaction.
As some of the prior posts suggest, a Proctor test is first performed on the soil in question. During that test, the soil is compacted and (to simplify things) two main pieces of info are generated: 1) max. dry density, 2) the moisture content that the soil has to be at in order to attain this max. dry density (usually a range).
The contractor now has to compact the soil to 95% of the max. dry density; i.e. 95% of the Modified Proctor number. If the soil is too wet or too dry, you're out of luck and will have to either wet the soil down, or dry it out prior to compaction.
RE: 95 modified compaction.
RE: 95 modified compaction.
RE: 95 modified compaction.
the proctor is more or less a measure of the compaction effort put in to the material (via a standardized test). and based on how well the materials is compacted somewhere near "optimum" material conditions, other engineering properties can be extrapolated.
yes, i realize i'm long winded and get on a roll and off the question sometimes but discussing and understanding soils is a slippery slope...a seemingly simple question leads to answers that need additinoal discussion about other relative thing. soils are by far the most complicated "animal" i've dealt with and i'm still learning something new every single day i'm at work. okay okay..i'm making myself stop now.