冻融对CACB材料粘弹性力学行为的影响  

Effect of freeze-thaw cycles on the viscoelastic mechanical behavior of CACB

作　　者：李云良[1] 孙海蛟 刘钰泽 谭忆秋[1] 徐垒 何鑫 LI Yunliang;SUN Haijiao;LIU Yuze;TAN Yiqiu;XU Lei;HE Xin(School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院

出　　处：《哈尔滨工程大学学报》2019年第8期1375-1380,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51078114)

摘　　要：为了研究冻融循环作用下水泥沥青复合胶结料的粘弹性力学行为,本文进行了CACB材料的冻融及蠕变试验。建立了四元件五参数的粘弹性力学模型,通过对蠕变试验结果的拟合分析,建立了CACB材料的本构方程。基于本构方程参数随冻融次数的变化,分析了冻融对CACB材料粘弹性力学行为的影响规律。研究表明:冻融作用降低了CACB材料抵抗瞬时弹性变形及剪切流动变形的能力,CACB材料的弹性性能受冻融作用的影响更为显著。粘弹性本构方程材料参数的变化可以反映CACB材料宏观力学性能的冻融损伤过程。冻融循环作用没有改变CACB材料的粘弹性属性,随着沥青含量的增加及温度的提高,CACB材料趋向于粘性材料的性质,抵抗载荷的能力降低、变形能力增强。The viscoelastic mechanical behavior of cement asphalt composite binder(CACB) under the influence of freeze-thaw cycles was studied through the freeze-thaw and creep tests. A viscoelastic mechanical model of four elements and five parameters was established, and the constitutive equation of CACB was set up on the basis of the fitting analysis of creep test results. The change in constitutive model parameters with freeze-thaw cycles were studied to analyze the laws underlying the influence of freeze-thaw cycles on the viscoelastic mechanical behavior of CACB. This study demonstrated that freeze-thaw cycles weakened the resistance of CACB to instant elastic deformation and shear flow deformation and dramatically influenced the elastic properties of CACB. The change in viscoelastic constitutive model parameters can be used to characterize the general mechanical properties of CACB with freeze-thaw damage. Although freeze-thaw cycles did not change the viscoelasticity of CACB, CACB exhibited viscous-material-like mechanical properties, reduced load resistance, and increased deformability as asphalt content and temperature increased.

关 键 词：水泥沥青复合胶结料 冻融 蠕变 粘弹性 损伤 本构方程 

分 类 号：TU535[建筑科学—建筑技术科学]