半刚性基层的材料特性.pdf

第21 卷 第1 期 中 国 公 路 学 报 V ol. 21 No. 1 2008 年1 月 Ch ina J our nal of H ig hw ay and T r an sport Jan . 2008 : 100 1-7372 2008) 0 1-000 1- 05 沙 爱 民 , 710064) : 从强度温度收缩和干燥收缩抗冲刷以及疲劳 4 个 面论述了半刚性基层材料的特性, 指 出: 半刚性基层材料的强度可以根据路面结构要求在一个很宽的值域内设计; 半刚性基层材料的强 度获得不仅要靠 一定剂量的结合料, 更要靠良好级配的集料; 及时的保湿养生可以避免半刚性基层 材料的干燥收缩裂缝; 控制细料含量可以显著减小半刚性基层材料的温度收缩裂缝; 通过减少细料 含量增加结合强度以及增大空隙率等合适的材料组成设计, 可以显著地提高半刚性基层材料的抗 冲刷性能; 半刚性基层材料是应力敏感性材料, 将半刚性基层放在路面中合适的层位, 可以使其具 有更长的疲劳寿命 : 道路工程; 半刚性基层; 试验研究; 材料性能; 强度; 收缩; 冲刷; 疲劳 : U 416. 2 : A Material Characteristics of Sem-i rigid Base SH A A i- min K ey L abo rato ry o f H ighw ay Engineer ing in Special Reg ion of M inistry of Educatio n, Changan U niv ersity , X i an 710064 , Shaanx i, China) Abstract: T he charact erist ics of sem-i rigid base mat erial w ere researched in f our aspect s: st reng t h, t emper at ure shrinkage and drying shrinkag e, erosion r esist ance and fat igue. Co nclu sions ar e as f ollo w ing: st reng t h o f sem-i rigid base mat erial can be designed in a quit e bro ad rang e by the requirement of pav em ent st ruct ur e and t he str engt h is obt ained no t o nly by the binder but also by agg reg ations properly designed ; cracks cau sed by dr ying shrinkage are av oidable by w el-l t imed curing and cracks cau sed by temperature shrinkag e can be r educed ev ident ly by cont rol ling t he content of f ine agg reg ate; ant-i erosio n perf ormance of sem-i rig id mat erial can be obv io usly im prov ed by designing pro per mat erial com posit io n, such as reducing the cont ent of f