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Abstract
The National Research Council of Canada, in collaboration with a Canadian roofing contractor, 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 used in Canada. The membrane samples were heat aged in convection ovents at 70 +/-3C for six months. During this process, some samples were withdrawn at two-month intervals and their tensile properties at 23C and -30C, cold flex temperature and glass transition temperature determined.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 23C but the modified bitumen goverened the failure mechanism at -30C for the polyester reinforced membranes.
The National Research Council of Canada, in collaboration with a Canadian roofing contractor, 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 used in Canada. The membrane samples were heat aged in convection ovents at 70 +/-3C for six months. During this process, some samples were withdrawn at two-month intervals and their tensile properties at 23C and -30C, cold flex temperature and glass transition temperature determined.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 23C but the modified bitumen goverened the failure mechanism at -30C for the polyester reinforced membranes.
Date
8/2003
8/2003
Author(s)
K Liu; G Xu; R Voyer
K Liu; G Xu; R Voyer
Page(s)
97-118
97-118
Keyword(s)
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
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