The increasing use of modified binders to inhibit reflection cracking, and the fact that these materials are sometimes unsuccessful, highlights the need to investigate the mechanisms of load-associated crack movement and crack reflection. The crack-activity meter (cam), developed to measure load-associated crack movement, is discussedin this paper. Heavy vehicle simulator (hvs) tests, incorporating crack-movement measurements are discussed, as well as various types of crack-movementbehavior. Four typical mechanisms of crack and joint movement are identified and discussed. This work has led to improved understanding of the mechanisms of crack movement and crack reflection and to a procedure, based on the measurement of crack movement, that can be used to aid rehabilitation design. This paper appears in transportation research record no. 1196, Pavement evaluation and rehabilitation.
Abstract