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Measuring moisture in concrete

Which of the following tests measures moisture in a concrete slab by measuring moisture emission in a non-destructive relative humidity test of a confined pocket of air immediately above a concrete surface?
A. polyethylene sheet test
B. electrical resistance test
C. hygrometer test
D. protimeter relative humidity test
AnswerC. hygrometer test or relative humidity test uses a sensor in an entrapped air-pocket space. Protimeter RH testing is a destructive method inserting the probe in a pre-drilled hole.

ARE 4.0 exam prep: BDCS

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