基于蠕变试验计算沥青的低温松弛弹性模量  

Calculation of Low-Temperature Relaxed Modulus of Elasticity for Bitumen via Creep Test

作　　者：薛忠军[1] 张肖宁[2] 詹小丽[1] 王佳妮[1] 赵影[3] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [2]华南理工大学道路工程研究所,广东广州510640 [3]吉林省交通建设集团有限公司,吉林长春130021

出　　处：《华南理工大学学报（自然科学版）》2007年第2期64-68,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：交通部西部交通建设科技项目(2001-318-000-38)

摘　　要：为了利用易操作的试验得到沥青的低温松弛弹性模量,采用沥青弯曲梁流变仪(BBR)测得沥青的蠕变柔量,通过对蠕变试验数据在时域内进行离散,根据蠕变与松弛之间的本构关系建立松弛弹性模量和蠕变柔量的数值迭代表达式.从迭代表达式可以计算出沥青在基准温度下的松弛弹性模量.使用时温等效换算法则可以得到不同温度下的松弛弹性模量主曲线,分析松弛弹性模量主曲线特性可以评价沥青的低温性能,为工程上选择合适的沥青提供参考.In order to obtain the low-temperature relaxed modulus of elasticity for bitumen by tests with easy manipulation, the blending beam rheometer （BBR） was used to measure the creep compliance. The experimental data of BBR were then discretized in time domain. According to the constitutive relationship between the creep and the relaxation, a numerical iteration expression was thus proposed to describe the relationship between the relaxed modu- lus of elasticity and the creep compliance. By the proposed expression, the relaxed modulus of elasticity for bitumen at the fiducial temperature was further calculated. Moreover, the main curves of the relaxed modulus of elasticity at different temperatures were drawn via the time-temperature equivalent principle. The characteristics of the main curve were finally analyzed and were used to evaluate the low-temperature performance of bitumen, thus providing some references for making the right choice of bitumen in practical engineering.

关 键 词：沥青 蠕变柔量 松弛弹性模量 弯曲梁流变仪 

分 类 号：U412.2[交通运输工程—道路与铁道工程]