USE OF MEMBRANE-FORMING CURING COMPOUNDS ON CONCRETE SURFACES THAT ARE TO BE PAINTED.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Corps of Engineers Standard Practice for Concrete prohibits use of curing compounds on concrete surfaces that are to be painted. Since substantial savings might be effected on some construction if curing compounds were available that could be painted over, a study was made to learn if there are curing compounds that can be successfully used as a base for paint, and to evaluate any located. A market analysis located six suitable compounds two chlorinated rubber and epoxy base, two chlorinated rubber and paraffin base, a styrene-butadiene base, and an alkyd-base material. Seven paints were selected for testing with each curing compound a exterior acrylic b exterior polyvinyl acetate c exterior and interior styrene-butadiene-acrylate d exterior and interior epoxy polyamide e interior, first coat latex, second coat alkyd and f interior latex. To test the curing compounds, small concrete panels were coated with each compound half were painted at 5 days and companion panels were painted at 60 days age control panels were prepared by painting directly over the panels test and control panels were exposed to various weathering conditions for 20 months. Results showed that all six curing compounds can be painted with most of the paints with no adverse effect when exposed indoors at moderate temperatures. For outdoors exposure in a moderate climate, painting over the compounds with exterior polyvinyl acetate paint produced a more durable surface than painted concrete. Styrene-butadiene-acrylate paint, however, did not produce as durable a painted surface as concrete. Author
- Ceramics, Refractories and Glass