The classification of bitumens and polymer modified bitumens within the SHRP performance grading system.

Author(s)
Claxton, M.J. & Green, P.J.
Year
Abstract

In most countries, bitumens are graded according to traditional tests. In 1997, the USA introduced a different binder grading, based on fundamental, rheological measurements (SHRP). Rather than a binder being classified as 35 or 70 pen or Class 50 or 320, it is a "64-28" or a "58-22". The numbers relate to high and low temperature performance respectively. This paper investigates SHRP grades for unmodified bitumens (and relating the two systems) and speciality bitumens. Key results are: (1) For unmodified, conventional bitumens, there appears to be a linear relationship between high and low temperature grades and between high temperature grade and softening point; this suggests SHRP grades can be predicted from softening point for unmodified binders; (2) Speciality binders are displaced from this line; the degree of displacement indicates the performance benefit provided by the speciality product. (A)

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Publication

Library number
C 18165 (In: C 18105 CD-ROM) /31 / ITRD 492079
Source

In: Proceedings : papers presented at Transport 98, the 19th ARRB Conference, Sydney, Australia, 7-11 December 1998, Session C, p. 1-18, 5 ref.

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