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The load-strain properties of several bituminous membranes when tested in tension are examined and the effect of temperature on the breaking load, load-strain modulus, and breaking strain is considered. The shear properties of the bitumens used as adhesives in the production of the membranes are examined at temperatures from -15 F (-26 C) to 32 F (0 C) at a rate of shear of 0.21 per min. The observed transition in the shear modulus of the asphaltic material at 0 F (-18 C) is found to coincide with the glass transition temperature of this material. The development of a critical-thickness concept is described, and it is suggested that the performance of roofing membranes under deformation may be controlled by the load-strain properties of the membrane and the shear properties of the adhesive.
bitumens, roofing membrane, tensile strength, shear testing, glass transition temperature
Jones, P. M.
Research officer, National Research Council, Ottawa,