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July 2 - July 6, 2018

What are the common moisture tests for vertical, below-grade concrete structures scheduled to receive a high-build, protective lining system?

Selected Answers

From Bill Slama of International Paint/Ceilcote Products on July 9, 2018:
We strongly prefer requiring the ASTM Plastic Sheet Test. The reason is that for proper performance of the coating or lining, two requirements must be met. Basically, the concrete surface needs to remain dry for 16 hours. This condition 1) allows the primer or first polymer layer to properly wet and penetrate the concrete surface while free of water, and 2) allows that contacting layer to begin to cure (cross-linking or simĀ­ple solvent evaporation), also in the absence of liquid water. Beyond that, a system's capability to withstand liquid water later at the concrete/polymer interface depends on the characteristics of the applied system.

From Mika Mack of MAPPA TESTLAB INC. on July 7, 2018:
Maturity meters on new construction give useful data; RH probes with bluetooth enabled(These work fairly well, even after they're covered with backfill.); not a huge fan of moisture meters and sheet method. It does give interesting data

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Tagged categories: concrete; High-build coatings; Moisture detection; Quality Control

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