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Abstract
This study systematically examined the effect of accelerated heat aging on the physical properties of SBS modified bituminous roofing membrane. Six commercially available SBS modified bituminous roofing membranes reinforced with non-woven polyester mat at two different densitites were heat aged in convection ovens at 70 C for 6 months. Samples were withdrawn at 2 month intervals and their glass transition temperature and physical properties (tensile strength, elongation and strain energy) at 23C and -30C were determined. Results showed that heat aging increased the glass transition temperature by 2-7C, and reduced the elongation and the strain energy of the membranes. The polyester mat controlled the tensile properties of the membrane at 23C while the modified bitumen governed those at -30C. The effects of heat aging were more pronounced when tested at -30C and in membranes containing less reinforcement.
This study systematically examined the effect of accelerated heat aging on the physical properties of SBS modified bituminous roofing membrane. Six commercially available SBS modified bituminous roofing membranes reinforced with non-woven polyester mat at two different densitites were heat aged in convection ovens at 70 C for 6 months. Samples were withdrawn at 2 month intervals and their glass transition temperature and physical properties (tensile strength, elongation and strain energy) at 23C and -30C were determined. Results showed that heat aging increased the glass transition temperature by 2-7C, and reduced the elongation and the strain energy of the membranes. The polyester mat controlled the tensile properties of the membrane at 23C while the modified bitumen governed those at -30C. The effects of heat aging were more pronounced when tested at -30C and in membranes containing less reinforcement.
Date
0/2001
0/2001
Author(s)
K Liu; G Xu; J Irwin; H Shen; R Voyer
K Liu; G Xu; J Irwin; H Shen; R Voyer
Page(s)
341-345
341-345
Keyword(s)
SBS modified bitumen; durability; accelerated aging; physical properties; heat aging
SBS modified bitumen; durability; accelerated aging; physical properties; heat aging