橡胶热再生混合料低温性能与细观特征研究

发布时间：2018-03-11 20:11

本文选题：沥青路面　切入点：再生沥青混合料　出处：《湖南大学学报(自然科学版)》2014年11期 　论文类型：期刊论文

【摘要】：以橡胶沥青再生混合料为研究对象,对冻融前后的小梁试件分别进行低温弯曲试验,研究不同胶粉掺量(6.4%,9.2%和14.1%)、不同胶粉细度(20目,40目和80目)和不同RAP掺量(25%,35%和50%)条件下的橡胶热再生沥青混合料的低温性能.基于工业CT无损检测技术,对冻融前后的橡胶热再生混合料试件分别进行扫描,并定量表征冻融前后试件体积指标的变化.研究结果表明:RAP掺量为25%,胶粉细度为80目,胶粉掺量为9.2%的橡胶热再生沥青混合料冻融后的低温性能下降幅度最小;相较于基质沥青热再生混合料,橡胶沥青热再生沥青混合料具有更好的耐久性及低温性能;通过对比工业CT扫描结果发现,冻融后的橡胶热再生沥青混合料试件闭口空隙率增大了20.3%,且在0~25mm3体积范围内的空隙数量减少了13.8%,在25~50 mm3体积范围内的空隙数量则增加了62.9%.
[Abstract]:Taking the rubber asphalt recycled mixture as the research object, the trabecular specimens before and after freeze-thaw were subjected to low temperature bending test. The low temperature properties of rubber hot regenerated asphalt mixtures with different content of rubber powder (6. 4% and 14. 1%, different fineness of rubber powder, 20 mesh, 40 mesh and 80 mesh) and different RAP content (25% and 50%) were studied. Based on the nondestructive testing technology of industrial CT, The rubber hot regenerated mixture specimens before and after freeze-thaw were scanned, and the volume indexes of the samples before and after freeze-thaw were quantitatively characterized. The results showed that the content of% rap was 25% and the fineness of rubber powder was 80 mesh. The low temperature performance of rubber hot recycled asphalt mixture with 9.2% rubber powder content is the smallest after freeze-thaw, and the rubber asphalt hot recycled asphalt mixture has better durability and low temperature performance than the base asphalt hot regenerated asphalt mixture. Comparing with the results of industrial CT scanning, it is found that the void ratio of rubber hot regenerated asphalt mixture after freeze-thawing increases 20.3m ~ 3, and the number of voids in the range of 0 ~ 25mm ~ 3 decreases by 13.8m ~ 3, and the number of pores in the range of 2550 mm3 increases by 62.9%.
【作者单位】：长安大学道路结构与材料交通行业重点实验室;中交通力建设股份有限公司;密歇根理工大学土木工程与环境学院;
【基金】：国家自然科学基金资助项目(51178056) 中央高校基本科研业务费专项资金资助项目(CHD2012ZD013)
【分类号】：U414

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