玄武岩纤维沥青碎石封层黏结性能及评价

Bonding Property and Evaluation of Basalt Fiber Asphalt Macadam Seal Coat

针对现有沥青碎石封层黏结不足、低温开裂等一系列问题,将一定量玄武岩纤维掺入沥青碎石封层中,制备了不同类型玄武岩纤维沥青碎石封层.通过板冲击试验、黏结拉拔试验和抗剪切试验,系统分析了玄武岩纤维掺量、长度和乳化沥青掺量对沥青碎石封层黏结性能的影响,并引入混合型多指标灰靶决策方法,对比评价玄武岩纤维沥青碎石封层综合黏结性能,进一步确定各材料的合理掺量,以提高玄武岩纤维沥青碎石封层的黏结性能及使用品质.结果表明:与普通沥青碎石封层相比,玄武岩纤维沥青碎石封层的脱石率降低11.0%~30.5%,层间拉拔强度、层间抗剪强度分别提高11.7%~16.3%和9.7%~22.4%.综合考虑路用性能和经济效益,玄武岩纤维沥青碎石封层中乳化沥青最佳掺量为1.6kg/m^2,玄武岩纤维最佳掺量为80g/m^2.

In order to solve the problems of insufficient interlayer bonding and low temperature cracking of asphalt macadam seal coat,a certain content of basalt fiber was added to the asphalt macadam seal coat and different types of basalt fiber asphalt macadam seal coat were prepared. Through the plate impact test,pull-out test and shear test,the effects of basalt fiber content,length and emulsified asphalt content on the asphalt macadam seal coat bonding property were systematically analyzed. Based on the mixed grey target decision-making method,the comprehensive bonding properties of basalt fiber asphalt macadam seal coat were compared and evaluated. The reasonable amount of each material was further determined,and the bonding properties and service performance of basalt fiber asphalt macadam seal coat were improved. The results show that compared with asphalt macadam seal coat,aggregate loss rate of basalt fiber asphalt macadam seal coat is lower than 11.0% 30.5%,interlaminar pull-out strength and shear strength of it are increased by 11.7% 16.3% and 9.7% 22.4% respectively. Considering the road performance and economic benefits,the optimum content of emulsified asphalt is 1.6 kg/m ^2 and the optimum content of basalt fiber is 80 g/m ^2.