Concrete and moisture creating a ‘hot topic'
January 1, 2007
In combating current moisture and concrete problems, more than a hundred flooring and concrete professionals gathered recently at the “Hot Topics” session during the American Concrete Institute (ACI) fall convention in Denver, Colo. The effects of concrete and moisture, and the techniques in solving these problems, were presented at the meeting.
Ward Malish, of American Concrete Institute, shared his new publication, “Guide for Concrete Slabs that Receive Moisture-Sensitive Flooring Materials.”
“There is a need for the two industries to work collectively to solve the moisture in concrete problem, which is effecting both entities.” said Malish.
Larry Press, of Helmitin Adhesives, spoke on the effects of concrete moisture on adhesives, concrete finishes and bonding to concrete. Independent Floor Testing & Inspection’s Lee Eliseian discussed the methods of moisture testing. These were the ASTM F-2170 Hygrometer probe testing, ASTM F-1869 Calcium chloride testing, ASTM E-1907 Evaluation methods for concrete moisture and ASTM F-2420 determining the relative humidity on the surface of concrete slabs.
Ray Thompson, Jr., of Floor Covering Institute and columnist for Floor Covering Installer and NFT magazines, addressed the flooring manufacturers’ concerns with concrete and moisture. They are as follows: vapor retarder/barriers, blotter layers, compressive strength of concrete, water/cement ratio, alkalinity, curing, sealing and parting compounds, cracking, curling, flatness and concrete trowel finish.
“The flooring industry is gaining a better understanding of the concrete industry, and vice-versa.” said Thompson.