Practical application of the EVT concept

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Conference12th International Roofing and Waterproofing Conference: 25 September 2002, Orlando, Florida
Pages115; # of pages: 15
Subjectequiviscous temperature, viscosity, fall back, softening point, bills of lading, built-up roofing; Roofs; Roofs
AbstractIn 1999, the Canadian Roofing Contractors' Association (CRCA) initiated a study to compare the quality and performance properties of bulk asphalt from various suppliers/manufacturers across Canada. The study was prompted by concerns raised by contractor members about the quality of bulk asphalt and, in particular, fallback (softening point drop back) after heating the asphalt during built-up roofing (BUR)applications. The study consisted of a quantitative analysis of changes to the physical properties of asphalt samples, including equiviscous temperature (EVT), after heating and assessment of the quality of the information provided to roofing contractors by asphalt suppliers/manufacturers regarding their recommended EVTs. The issue of the quality of EVT information is discussed in Appendix A of this paper. The concept of EVT is widely accepted as a quality control instrument in the application of BURsystems. The study was designed to assess the effectiveness of the concept as currently applied in the field.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number44752
NPARC number20386235
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Record identifierbd78ae4c-b2b5-4ccc-9b16-2307d9a29d20
Record created2012-07-25
Record modified2016-05-09
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