Research was conducted to evaluate generic types of sealer and coating systems for use on nonwearing concrete surfaces in Indiana. Although significant variations exist among six generic classes of coating systems subject to accelerated weathering, water absorption and vapor transmission, and rapid chloride ion permeability tests, certain generic chemical formulations of coating systems appear to exhibit comparatively better performance than others. The epoxies were comparatively better barriers to chloride and water absorption but deteriorated and discolored slightly in the accelerated weathering test. The straight penetrants (straight silanes, silicone, and siloxane) were relatively good in terms of their ability to resist water andchloride absorption and showed little sign of deterioration in the weathering test. The materials that were combinations of the above penetrants did not perform as well as the straight penetrants. Masonry coatings were ineffective chloride barriers, but they did have aesthetic qualities. The urethane and methyl methacrylate did not perform consistently across all tests.
Samenvatting