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Recent trends in the formulating of hot applied rubberized asphalts have led to increased cohesive strengths in these materials. As a result, it was noted that these products would fail adhesively in the conventional toughness-tenacity test, making it impossible to assess their true elastomeric nature. This problem has been overcome by redesigning the test equipment to promote cohesive failure. Both the tension head and the toughness cup of the Benson test required modification to arrive at an acceptable test, the hemispherical head being replaced by a threaded bolt, and the cup being deepened to accommodate more test material and thus allow for the larger volume of the new tension head. Use of the new test apparatus has been written into the Canadian Government Specifications Board specification on Hot Applied Rubberized Asphalts.
bituminous materials, asphalts, rubberized asphalts, toughness, tenacity, waterproofing, roofing, test methods, durability, building materials
Development manager Industrial Products Division, Uniroyal Limited, Braceridge, Ont.