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Cold, liquid-applied elastomeric deck coating and membrane systems are widely used for waterproofing concrete structures. Typically these systems are liquid-applied in relatively thin mil thicknesses, bonded continuously to the substrate, and cured to a seamless elastomeric barrier for waterproofing protection. A critical property of these materials is the ability to bridge cracks. These materials may be used as traffic-bearing or nontraffic-bearing systems. In some cases they will be exposed directly to sun and weather and in others they will not. ASTM C 836 and ASTM C 957 describe a laboratory procedure for evaluating the crack-bridging capability of these materials. Field observations suggest some limitations with the use of this test as a predictor of crack-bridging properties, however. A clear understanding of why and how concrete structures crack and the relevance of different types of structural design, the impact of various environmental conditions, as well as the properties and limitations of the waterproofing materials are all essential in avoiding problems associated with structural cracks reflecting through the membrane and allowing water penetration into and/or through the slab.
cast in place, cracking, elastomeric membrane, liquid applied, mil thickness, posttensioned, prestressed, reflective cracking, shrinkage cracks, strip coating, thermal movement, traffic topping
Vice president, Harry S. Peterson Co., Inc., Pontiac, MI