My firm typically conducts some foundation installation and back-fill in the winter in order to meet schedule and at times the temperatures are well below zero. We have had some internal and external discussions regarding the testing of the material within these sub-zero temperatures. The material that we are placing is thawed imported fill and we are placing it in lifts of 12". We have been told by some of the testers that the machines that our testers are using are good to temperatures of -20°F but we would like some verification of this claim. Also we have have compacted a lift and not tested it till the day after placement and saw densities that were higher but with a lower moisture than what we had seen with the same effort testing it immediately after placement. My question here is: Do ice particles read on the machine like a solid or will they still be read as moisture and why? Thanks in advance for any insight.
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