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ASCC Publishes 44th Position Statement
June 13, 2019

The American Society of Concrete Contractors (ASCC), St. Louis, MO, has published its forty-fourth Position Statement, “Measuring Air Content in Non-Air-Entrained Concrete.” ASCC Position Statements clarify the concrete contractors’ point of view for architects, engineers, owners and others.

Position Statement #44 explains that while air content is reported in the mix design submitted for air-entrained concrete and measured in the field for compliance, air content measurements are rarely specified or measured for non-air-entrained concrete.

Specifications such as ACI 301 and MasterSpec 033000 – Cast-in-Place Concrete require a maximum air content in concrete floors to receive a hard-troweled finish, and for good reason, according to ASCC technical director Bruce Suprenant, PE, PhD, FACI. “Air-entraining admixtures should not be specified or used in concrete to be given a smooth, dense, hard-troweled finish,” says Suprenant, “due to the probability of blistering or delamination occurring as a result.”

ASCC contractors have observed that when water-reducing and/or waterproofing admixtures are used in concrete to receive a hard-troweled finish, air contents often exceed the 3% maximum set out in ACI 302.1R-15, “Guide to Concrete Floor and Slab Construction.”

Often contractors aren’t alerted to this issue because the air content isn’t measured, says Suprenant. Thus, Position Statement #44 concludes, ASCC contractors encourage owners to direct specifiers to require measuring the air content of concrete to receive a hard-troweled finish.

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