Performance of Polymer Modified Asphalt Bridge Expansion Joints in Low-Temperature Regions
Publication: Journal of Performance of Constructed Facilities
Volume 23, Issue 4
Abstract
Conventional asphalt bridge expansion joints used in low-temperature regions generally show cracking within the first . To improve the low-temperature performance of these joints, the commercial MEIJIA asphalt binder commonly used in bridge expansion joint construction was modified with two polymers: thermoplastic rubber and rubber. The goal is to find an optimum combination of polymers, binders, and aggregates to improve the performance of asphalt expansion joints in low-temperature regions. The polymer modified binders and mixtures were evaluated for their low-temperature properties using ductility, penetration, indirect tension, and bending tests. The study indicates that performance of these joints at low temperature can be enhanced significantly with the right combinations of polymers, binders, and aggregates. Four expansion joints made with the polymer modified asphalt mixtures were installed on two bridges in a cold region. A construction procedure was also developed to install these joints properly to minimize low-temperature cracking along the interface between the joint and bridge deck. After of service, the four joints show good performance without any visible cracking or rutting.
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© 2009 ASCE.
History
Received: Aug 15, 2006
Accepted: Mar 31, 2009
Published online: Jul 15, 2009
Published in print: Aug 2009
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