Experiment and simulation of creep performance of basalt fibre asphalt mortar under uniaxial compressive loadings  

单轴受压下玄武岩纤维沥青砂浆流变性能试验及仿真（英文）

作　　者：张小元[1] 顾兴宇[1] 吕俊秀[1] 朱宗凯[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《Journal of Southeast University(English Edition)》2016年第4期472-478,共7页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51108082)

摘　　要：The creep performance of basalt fibre（BF）reinforced in asphalt mortar under uniaxial compressive loadings is investigated. The samples of basalt fibre asphalt mortar（BFAM） with different BF mass fractions（0. 1%,0. 2%, and 0. 5%） and without BF in asphalt mixture are prepared, and then submitted for the compressive strength test and corresponding creep test at a high in-service temperature.Besides, numerical simulations in finite element ABAQUS software were conducted to model the compressive creep test of mortar materials, where the internal structure of the fibre mortar was assumed to be a two-component composite material model such as fibre and mortar matrix. Finally, the influence factors of rheological behaviors of BFAM are further analyzed. Results indicate that compared to the control sample, the compressive strength of BFAM samples has a significant increase, and the creep and residual deformation are decreased. However, it also shows that the excessive fibre, i.e. with the BF content of 0. 5%, is unfavorable to the high-temperature stability of the mortar. Based on the analysis results, the prediction equations of parameters of the Burgers constitutive model for BFAM are proposed by considering the fibre factors.研究了玄武岩纤维加筋沥青砂浆在单轴受压作用下的流变性能.首先,通过制备加质量分数为0.1%,0.2%,0.5%的沥青混合料纤维和不加纤维的沥青砂浆试件,实施了高温条件下的压缩强度试验和相应蠕变试验.结果表明,相较于纯沥青砂浆,纤维砂浆的抗压强度有较大提高,蠕变变形和相应的残余变形降低,但当纤维过量时,即0.5%纤维含量,其性能反而不利.同时,利用有限元ABAQUS软件开展了纤维加砂浆两相复合材料的流变模拟,得到模拟与试验相一致的结果,并分析了纤维模量与含量对砂浆流变特性的影响.基于上述分析结果提出了纤维影响因素的Burgers本构模型参数预测方程.

关 键 词：basalt fibre asphalt mortar uniaxial compressive creep performance 

分 类 号：U416[交通运输工程—道路与铁道工程]