SEDL / STP / STP959-EB / STP25727S

Measuring Adhesion and Cohesion of Rubberized Asphalts

Dutt, O
Visiting scientist and research officer, Materials Section, Institute for Research in Construction, National Research Council of Canada, Ottawa, Canada

Ashton, HE
Visiting scientist and research officer, Materials Section, Institute for Research in Construction, National Research Council of Canada, Ottawa, Canada

Laaly, HO
Consultant, Los Angeles, CA

Pages: 17    Published: Jan 1987

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Abstract

Adhesion and cohesion are important aspects of performance of rubberized asphalts used for roofing and waterproofing. The conventional toughness-tenacity test performed with either the hemispherical or screw-type pull-head gives results that represent a combination of adhesive and cohesive forces. In many cases adhesion is lost, thus affecting peak load values. A new, tapering, grooved head designed to improve the adhesion aspect has been tested with four commercial samples of rubberized asphalt. The results are compared with those for other heads. Most tests were conducted at several speeds of loading to study the effect on toughness and tenacity values. In a second series of tests, the effect of adhesion was eliminated and only cohesion determined. Finally, straight pull-off adhesion tests and ductility tests were conducted on all samples. The results suggest that the present accepted test methods and numerical requirements for the related physical properties in standards for hot-applied rubberized asphalts should be reassessed.