基于响应面法的半柔性路面材料低温性能研究
Study on low temperature performance of semi-flexiblepavement materials based on response surface method
程培峰 1王洋弘历 1李艺铭 1马广涛1
作者信息
- 1. 东北林业大学土木与交通学院,哈尔滨 150000
- 折叠
摘要
为提高半柔性路面材料(SFPM)低温抗裂性能,采用橡胶粉与硅烷偶联剂对水泥砂浆进行改性,制备复合半柔性路面材料(R&S-SFPM).基于响应面分析法以劈裂抗拉强度、抗弯拉强度、最大弯拉应变、弯曲蠕变速率以及平均线收缩系数作为评价指标分析胶粉目数、掺量及硅烷偶联剂用量对SFPM低温性能的影响,并确定了可获得最优低温性能表现的R&S-SFPM掺配比例.结果表明:橡胶粉可提高SFPM的应力松弛能力,使其具有更好的柔韧性;硅烷偶联剂可提高SFPM力学强度.此外,橡胶粉及硅烷偶联剂掺量、胶粉目数均对SFPM低温性能改善效果有较大影响.当胶粉目数为60目、掺量为14％,硅烷偶联剂用量为0.72％时,R&S-SFPM综合低温效果最佳;与普通半柔性路面材料(O-SFPM)相比,R&S-SFPM的劈裂抗拉强度、抗弯拉强度、最大弯拉应变以及弯曲蠕变速率分别提高23.7％、7.6％、29.9％和15.2％.
Abstract
In order to improve the low temperature crack resistance of semi-flexible pavement material(SFPM),the cement mortar was modified by rubber powder and silane coupling agent to prepare composite semi-flexible pavement material(R&S-SFPM).Based on the response surface analysis method,the splitting tensile strength,flexural tensile strength,maximum flexural tensile strain,flexural creep rate and average linear shrinkage coefficient were used as evaluation indexes to analyze the effects of rubber powder mesh,dosage and silane coupling agent dosage on the low temperature performance of SFPM,and the R & S-SFPM blending ratio that can obtain the best low temperature performance was determined.The results show that rubber powder can improve the stress relaxation ability of SFPM and make it have better flexibility.Silane coupling agent can im-prove the mechanical strength of SFPM.In addition,the content of rubber powder and silane coupling agent and the mesh number of rubber powder have a great influence on the improvement effect of SFPM low temperature performance.When the rubber powder mesh is 60 mesh,the dosage is 14％,and the dosage of silane coupling agent is 0.72％,the comprehensive low temperature effect of R & S-SFPM is the best.Compared with ordinary semi-flexible pavement material(O-SFPM),the splitting tensile strength,bending tensile strength,maximum bending tensile strain and bending creep rate of R & S-SFPM are increased by 23.7％,7.6％,29.9％and 15.2％.respectively.
关键词
道路工程/半柔性路面材料/响应面法/低温性能/橡胶粉/硅烷偶联剂Key words
pavement engineering/semi-flexible pavement material/response surface method/low-temperature per-formance/rubber powder/silane coupling agent引用本文复制引用
基金项目
中央高校基本科研业务费专项资金资助(2572022DX09)
黑龙江省交通运输厅科技项目(43220060)
出版年
2024
NETL
NSTL
万方数据