沥青路面裂缝密封胶的低温应力松弛评价指标  

Low-temperature Stress Relaxation Evaluation Index of Asphalt Pavement Crack Sealants

作　　者：李峰[1] 黄颂昌[1] 

机构地区：[1]交通运输部公路科学研究院道路结构与材料交通行业重点实验室,北京100088

出　　处：《同济大学学报（自然科学版）》2012年第8期1185-1188,共4页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51008146);交通运输部交通建设科技项目(2011318223410)

摘　　要：选择四种加热型密封胶和两种有机硅密封胶,参照交通行业标准进行低温拉伸试验,达到50%应变量后进行应力松弛试验,采用三参数固体模型拟合应力松弛试验数据.结果表明,三参数固体模型可以理想地拟合密封胶的黏弹性力学行为,模型的两个黏弹性特征参数——最大松弛比例和松弛时间,可以评价不同密封胶的应力松弛能力,但拟合过程较为复杂。定义了松弛指数,该指标与采用黏弹性特征参数的评价结果一致,可作为密封胶行业标准低温性能评价的一个补充指标.Four kinds of hot-applied sealants and two kinds of silicone sealants were tested by low-temperature extension test according to the transport industry standard. The stress relaxation tests started when the strain of the sealants was up to 50% by adopting the three-parameter solid model to analyze the test data. Results show that the viscoelastic behavior of the sealants can be modeled very well with the three-parameter solid model; and two parameters of the solid model, maximum relaxation rate and relaxation time, which represent the viscoelastic characteristics of the sealants, have the potential to evaluate the stress relaxation performance for different sealants, though the fitting process is very complex. Furthermore, a relaxation index was defined in this work. The evaluation results based on the proposed index agree well with those from the viscoelastic parameters. The relaxation index can be used as a supplementary indicator for the lowtemperature performance evaluation of the sealants on the basis of the transport industry standard.

关 键 词：沥青路面 密封胶 三参数固体模型 黏弹性 应力松弛 松弛指数 

分 类 号：U414[交通运输工程—道路与铁道工程]