Water Absorption in Cold Liquid-Applied Waterproofing

摘要

Some widely used cold fluid-applied waterproofing materials are prone to failure involving water absorption. These products meet the standards of ASTM Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course (C 836). Experienced investigators of.waterproofing systems are familiar with this failure mode; some refer to the convoluted appearance of a membrane after water absorption as "braining." Our investigation into this mode of failure examines the properties of waterproofing materials and application methods. This report includes the results of testing with four different application methods, and varying conditioning periods. Testing included immersion in water at 50℃ (122℉). Test specimens absorbed more water than allowed by the Canadian General Standards Board's (CGSB) standard Membrane, Elastomeric, Cold-Applied Liquid, for Non-Exposed Use in Roofing and Waterproofing (CAN/CGSB-37-58).