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Abstract
This study was conducted to revise the performance criterion for tensile strength of bituminous built-up membranes. Bituminous membrane samples, fabricated from polyester fabric, polyester glass composite fabric, and single plies of APP- and SBS-modified bitumen, were tested in tension to determine their load-elongation properties and to measure their strain energy. The results of the tensile tests of the new bituminous membranes indicated wide variability of load and elongation among the different types of materials. As an alternative to the criterion that a bituminous built-up membrane have a tensile strength of 200 lbf/in, it was recommended that the strain energy should be a minimum of 3 lbf in/in., when tested at 0 F in the weaker direction. The properties of the membrane samples in the study were compared to the suggested revised performance criterion. Two polyester samples (without glass), having relatively low strength and low ultimate elongation at 0 F, did not conform to the revised criterion.
This study was conducted to revise the performance criterion for tensile strength of bituminous built-up membranes. Bituminous membrane samples, fabricated from polyester fabric, polyester glass composite fabric, and single plies of APP- and SBS-modified bitumen, were tested in tension to determine their load-elongation properties and to measure their strain energy. The results of the tensile tests of the new bituminous membranes indicated wide variability of load and elongation among the different types of materials. As an alternative to the criterion that a bituminous built-up membrane have a tensile strength of 200 lbf/in, it was recommended that the strain energy should be a minimum of 3 lbf in/in., when tested at 0 F in the weaker direction. The properties of the membrane samples in the study were compared to the suggested revised performance criterion. Two polyester samples (without glass), having relatively low strength and low ultimate elongation at 0 F, did not conform to the revised criterion.
Date
9/1986
9/1986
Author(s)
Walter Rossiter Jr; Dale Bentz
Walter Rossiter Jr; Dale Bentz
Page(s)
60
60
Keyword(s)
bituminous roofing, performance criteria; polymer modified; strain energy; polyester; tensile strength; low slope roofing
bituminous roofing, performance criteria; polymer modified; strain energy; polyester; tensile strength; low slope roofing