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The National Research Council of Canada, in collaboration with a Canadian roofing manufacturer, conducted an experimental program to evaluate the durability of SBS-modified bituminous roofing membranes in Canada. This study examined the effect of heat aging on the mechanical and chemical properties of nine commercially available SBS-modified membranes, with emphasis on cold temperature performance. These membranes varied in reinforcements and densities, and were selected to be representative of SBS-modified membranes currently used in Canada. The membrane samples were heat aged in convection ovens at 70±3°C for six months. During this process, some samples were withdrawn at two-month intervals and their tensile properties at 23°C and -30°C, cold flex temperature and glass transition temperature determined. The results confirmed that heat aging mainly affected matrix-controlled properties of the membranes. In addition, the reinforcement controlled the mechanical properties at 23°C but the modified bitumen governed the failure mechanism at -30°C for the polyester reinforced membranes.
SBS, modified bituminous membrane, durability, tensile, strength, elongation, strain energy, low temperature flexibility, cold flex temperature, glass transition temperature, failure mechanism, low temperature, cold weather
Research Officer, National Research Council, Ottawa, ON
Industrial Research Fellow, National Research Council, Ottawa, ON
Research Director, Soprema Inc., Drummondville, Quebec