摘要
沥青路面面层内部存在明显的温度梯度,而目前的车辙试验无法反映这一特点。研制车辙试件温度梯度控制系统,可以在车辙试件内部形成温度梯度;利用该系统模拟路面温度梯度,开展不同面层组合结构的全厚式车辙试验。试验结果表明,温度梯度下沥青面层的整体抗车辙性能优于均匀温度下的抗车辙性能;若减弱表面层抗车辙性能并同时增强中面层抗车辙性能,则不仅能够改善沥青面层整体抗车辙性能,而且其改善效果优于仅仅增强表面层的方法;若减弱表面层抗车辙性能并同时增强下面层抗车辙性能,却很难改善沥青面层整体抗车辙性能。试验分析表明,本文提出的温度梯度全厚式车辙试验可以用于沥青面层结构的抗车辙性能检验,能用于沥青面层的抗车辙结构优化。
There is temperature gradient in asphalt road surfaces.However,the present laboratory rut tests for single asphalt surface layer and asphalt surface course were carried out under uniform temperature condition.A control system was developed to generate temperature gradient in the rut sample,and a series of total-thickness laboratory rut tests was carried out using the temperature gradient control system.Test results show that the rutting resistance performance of the entire surface course under temperature gradient is superior to that under uniform temperature condition.The way by weakening top surface layer rutting resistance and simultaneously strengthening middle surface layer rutting resistance not only improved the entire surface course rutting resistance,but also was better in rutting resistance performance than the way by only strengthening top surface layer rutting resistance performance.The way by weakening top surface layer rutting resistance and simultaneously strengthening bottom surface layer rutting resistance is difficult for improving the entire surface course rutting resistance performance.The analysis results indicate that total-thickness asphalt surface rut tests under temperature gradient is more appropriate to verify asphalt surface course rutting resistance and to optimize surface layer combinations.
出处
《土木工程学报》
EI
CSCD
北大核心
2011年第6期143-147,共5页
China Civil Engineering Journal
基金
国家西部交通建设科技项目(2009318000070
200731800003)
关键词
沥青路面
温度梯度
全厚式车辙试验
整体抗车辙性能
asphalt pavements
temperature gradient
total-thickness laboratory rut tests
the whole surface course＇s rutting resistance performance
