- Author
-
Liu, K.
|
Xu, G.
|
Voyer, R.
- Title
- Durability and Cold Temperature Performance of SBS-Modified Bituminous Roofing Membranes.
- Coporate
- National Research Council of Canada, Ottawa, Ontario
- Report
-
NRCC-47025,
- Book or Conf
- Roofing Research and Standards Development, Fifth Symposium. Volume 5. Proceedings. ASTM STP 1451. December 7, 2003,
Tampa, FL,
Rossiter, W. J.; Wallace, T. J., Editors,
97-118 p.,
2003
- Keywords
-
roofs
|
temperature
|
tensile strength
|
low temperature
|
durability
|
flexibility
|
weather effects
- Identifiers
- modified bituminous membrane; elongation; strain energy; low temperature flexibility; cold flex temperature; glass transition temperature; failure mechanism; cold weather
- Abstract
- 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 During this process, some samples were withdrawn at two-month intervals and their tensile properties at 23°C and -30°C, cold flex temperature and glass transition temperature determined.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.