Zhu Chunfeng, Luo Huijin, Tian Wei, Teng Binbin, Qian Yongmei, Ai Huaxue, Xiao Bo
College of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China.
Changchun Municipal Engineering Design & Research Institute, Changchun 130033, China.
Polymers (Basel). 2022 Jan 20;14(3):414. doi: 10.3390/polym14030414.
The fatigue resistance of asphalt mixture is an important indicator to evaluate the durability of asphalt pavement. In order to improve the fatigue properties of asphalt mixture, diatomite and environmental basalt fiber were added. Four types of asphalt mixtures, ordinary asphalt mixture (AM), diatomite modified asphalt mixture (DAM), basalt fiber modified asphalt mixture (BFAM) and diatomite/basalt fiber composite modified asphalt mixture (DBFAM), were chosen, whose optimum asphalt-aggregate ratio, optimum content of diatomite and optimum content of basalt fiber could be determined by Marshall test and response surface methodology (RSM). The multi-functional pneumatic servo Cooper test machine was carried out by a four-point bending fatigue test. Through the comparative analysis of flexural-tensile stiffness modulus (), initial stiffness modulus(), residual stiffness modulus ratio, lag angle () and cumulative dissipation energy (), the fatigue resistance of asphalt mixture can be effectively improved by adding diatomite and basalt fiber. Grey correlation analysis was also used to analyze the degree of correlation between the fatigue life and the influencing factors such as VV, VMA, VFA, OAC, , and . The analysis results indicate that has the greatest impact on the fatigue life of the asphalt mixture.
沥青混合料的抗疲劳性能是评价沥青路面耐久性的重要指标。为提高沥青混合料的疲劳性能，添加了硅藻土和环境玄武岩纤维。选取了四种类型的沥青混合料，即普通沥青混合料（AM）、硅藻土改性沥青混合料（DAM）、玄武岩纤维改性沥青混合料（BFAM）和硅藻土/玄武岩纤维复合改性沥青混合料（DBFAM），其最佳沥青-集料比、硅藻土最佳含量和玄武岩纤维最佳含量可通过马歇尔试验和响应面法（RSM）确定。采用多功能气动伺服库珀试验机进行四点弯曲疲劳试验。通过对弯拉劲度模量（）、初始劲度模量（）、残余劲度模量比、滞后角（）和累积耗散能的对比分析，添加硅藻土和玄武岩纤维可有效提高沥青混合料的抗疲劳性能。还采用灰色关联分析方法分析了疲劳寿命与空隙率（VV）、矿料间隙率（VMA）、有效沥青膜厚度（VFA）、最佳沥青用量（OAC）、（）和（）等影响因素之间的关联度。分析结果表明，（）对沥青混合料疲劳寿命的影响最大。
