填充式沥青基桥梁无缝伸缩缝材料性能研究

Research on Performance of Seamless Expansion Joint Materials for Filled Asphalt-based Bridge

摘要:

为优选无缝伸缩缝材料类型，提高无缝伸缩缝填充材料的路用性能与经济性。选用SBS增弹剂、矿粉和抗车辙剂对原样沥青进行复合改性，制备无缝伸缩缝沥青胶结料，采用针入度、软化点、旋转黏度及弹性恢复率等指标来评价其基本性能，最后以性能满足要求的沥青胶结料为原料制备无缝伸缩缝沥青填充料，结合高低温性能试验和回弹性能测试进行性能验证。试验结果表明，改性后的沥青胶结料性能优良，无缝伸缩缝沥青填充料的高温稳定性、低温抗裂性及弹性恢复能力均优于常规改性沥青混合料，满足无缝伸缩缝材料的技术指标要求，且相比市面材料经济效益显著。

Abstract:

To optimize the material type of seamless expansion joints and enhance the pavement performance and economy of the filling materials for seamless expansion joints, SBS elasticizer, mineral powder and anti-rutting agent are selected to conduct the composite modification on the original asphalt and prepare the asphalt binder for seamless expansion joints. The basic performance is evaluated by indicators such as penetration, softening point, rotational viscosity and elastic recovery rate. Finally, the asphalt binder with performance meeting the requirements is used as the raw material to prepare the asphalt filler for seamless expansion joints. The performance verification is carried out by combining high and low temperature performance tests and resilience performance tests. The test results show that the modified asphalt binder has excellent performance. The high-temperature stability, low-temperature crack resistance and elastic recovery ability of the seamless expansion joint asphalt filler are all superior to those of the conventional modified asphalt mixture, which meets the technical index requirements of the seamless expansion joint material, and has the significant economic benefits compared with the materials available on the market.