Performance of Polymer Modified Asphalt Bridge Expansion Joints in Low-Temperature Regions |
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Authors: | Tianlai Yu Chengyu Li Sigang Wu |
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Affiliation: | 1Postdoctoral Fellow, School of Civil Engineering, Beijing Jiaotong Univ., No. 3, Shangyuancun, Xizhimenwai, Beijing, 100044, P. R. China; and, Professor, School of Civil Engineering, Northeast Forestry Univ., No. 26, Hexing Rd., Xiangfang District, Hargin 150040, P. R. China. E-mail: TianlaiYu@126.com 2Principal Bridge Engineer, URS Corporation, 8181 East Tufts Ave., Denver, CO 80237; formerly, Guest Professor, College of Civil Engineering, Northeast Forestry Univ., 26 Hexing Rd., Xiangfang District, Harbin 150040, P. R. China (corresponding author). E-mail: chengyu_li@urscorp.com 3Researcher, Harbin Institute of Technology, 92 Xidazhi Rd., Nangang District, Harbin, 150090, P. R. China.
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Abstract: | Conventional asphalt bridge expansion joints used in low-temperature regions generally show cracking within the first 2?years. 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 7?years of service, the four joints show good performance without any visible cracking or rutting. |
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Keywords: | Bridges Joints Polymers Asphalts Cold regions Temperature effects Cracking |
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