We have been purchasing a material from a limestone quarry in lower-central Alabama, that the owner describes as a Dark Orange Brown sandy fat clay. This material has worked well for us on several different projects. When compacted, it provides a good hard surface and it holds up well with very little change even when wet. There is another quarry 25 miles from this quarry with the same type of material and the owner swears it is the same material and it does look exactly the same but this material turns to mush when it gets wet. These are both limestone quarries with very similar clay, but they react very differently to water. We took samples of the material and had it analyzed with the good clay the plasticity index is 34, on the new material the index is 16
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