胶粉纤维复合改性水泥稳定碎石路用性能研究
Research on the Road Performance of Rubber Powder Fiber Composite Modified Cement Stabilized Macadam
胡勇勇 1陶正文 1周志刚 2文泽海 2陈功鸿2
作者信息
- 1. 江西交通投资集团有限责任公司 南昌市 330001;江西交通咨询有限公司 南昌市 330001
- 2. 长沙理工大学道路结构与材料交通行业重点实验室 长沙市 410114
- 折叠
摘要
以普通水泥稳定碎石、胶粉改性水泥稳定碎石和纤维改性水泥稳定碎石为对照组,对胶纤复合改性水泥稳定碎石的抗干缩性能、抗冻性能、抗冲击性能和力学性能进行研究.结果表明:(1)胶粉对水泥稳定碎石抗干缩性能、抗冻性能的提升优于PAV纤维,PAV纤维对水泥稳定碎石的抗冲击性能提升优于胶粉;(2)通过胶纤复合改性后水泥稳定碎石的28 d干缩应变减少了 72.3％,冻融循环后的强度损失减少了 74.8％,初次开裂冲击韧性提升了317.7％;(3)胶粉改性会使水泥稳定碎石的力学性能下降,通过胶纤复合改性能够使胶粉改性造成的强度损失得到弥补,使复合改性后的水泥稳定碎石力学强度与普通水泥稳定碎石基本相同.
Abstract
In this paper,with ordinary cement stabilized macadam,rubber powder modified cement stabilized macadam and fiber-modified cement-stabilized macadam as the control group,the dry shrinkage resistance,frost resistance,impact resistance,and mechanical properties of rubber and fiber composite-modified cement-stabilized macadam is studied.The results show that:(1)the improvement of dry shrinkage resistance and frost resistance of rubber powder to cement-stabilized macadam is better than that of PAV fiber,and the impact resistance of PAV fiber is better than that of rubber powder.(2)After rubber and fiber composite modification,the 28-day dry shrinkage strain of cement-stabilized macadam decreases by 72.3％,the strength loss after the freeze-thaw cycle decreases by 74.8％,and the initial cracking impact toughness increases by 317.7％.(3)The mechanical properties of cement-stabilized macadam can be decreased by rubber powder modification,and the strength loss caused by rubber powder modification can be compensated by rubber and fiber composite modification.The mechanical strength of cement-stabilized macadam after composite modification is the same as that of ordinary cement-stabilized macadam.
关键词
半刚性基层/水泥稳定碎石/胶粉纤维复合改性/抗干缩性能/抗冻性能/抗冲击性能Key words
semi-rigid base/cement stabilized macadam/composite modification of rubber powder and fiber/dry shrinkage resistance/frost resistance/impact resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据