摘要
基于钢桥桥面铺装沥青混合料承受高应变的特殊受力效应,开发一种具有微变形吸收功能的沥青混合料。基于对典型沥青混合料吸收变形能力的总结分析,以SMA-13型级配为基础,保留大粒径骨料的分布状态,采用40目及80目胶粉颗粒以不同比例分别替换不同粒径的细集料(0.3~0.075mm范围)进行混合料级配的调整,采用高掺量新型SBS改性剂进行沥青胶结料的韧性增强,基于上述技术调整实现混合料应变吸收功能的附加。采用混合料高温车辙、劈裂、小梁弯曲、冻融劈裂等力学评价手段对本项研究中开发的新型沥青混合料的力学性能进行全面的检测。研究结果表明,采用的级配及胶结料的调整技术可以使得混合料的极限弯拉应变提高1.8倍,劈裂强度及水稳定性显著增强,且高温稳定性未见降低。基于上述分析可知,开发的具有微变形吸收功能的新型沥青混合料特别适用于钢桥桥面铺装,对提升桥面铺装的服役性能具有显著作用。
Based on the special stress effect of the asphalt mixture for pavement of steel bridge deck under high strain, a kind of asphalt mixture with micro-deformation absorption function was developed in this study. Based on the summary and analysis of the absorption deformation ability of typical asphalt mixture, based on SMA-13 grading, the distribution state of large particle size aggregate is retained, and the fine aggregate of different particle size(0.3~0.075mm) is replaced by rubber powder particles of different 40 mesh and 80 mesh with different proportions for the adjustment of mixture grading. The high-content star SBS modified asphalt was used to enhance the toughness of asphalt binder, and the additional strain absorption function of the mixture was realized based on the above technical adjustment. Mechanical evaluation methods such as high temperature rutting, splitting, trabecular bending and freeze-thaw splitting were used to comprehensively test the mechanical properties of the new asphalt mixture developed in this study. The research results show that the gradation and binder adjustment technology used in this study can increase the ultimate flexural and tensile strain of the mixture by 1.8 times, and the splitting strength and water stability are significantly enhanced, and the high temperature stability is not decreased. Based on the above analysis, it can be seen that the new asphalt mixture developed in this study with the function of micro-deformation absorption is especially suitable for bridge deck pavement of steel Bridges, which has a significant impact on improving the service performance of bridge deck pavement.
作者
孙娇娜
SUN Jiaona(Hangzhou Urban&Rural Construction Design Institute Co.,Ltd.,Hangzhou 310014,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期1358-1361,共4页
Building Structure
关键词
桥面铺装
应变吸收
级配调整
胶结料设计
性能评价
bridge deck pavement
strain absorption
grading adjustment
binder design
performance evaluation
