摘要
本文依托漯河某二级公路建设项目,通过室内试验,确定沥青混合料矿料级配、木质素纤维掺和量,并对不同纤维掺和量的沥青混凝土试件进行了低温抗裂试验。试验结果表明,掺和纤维后能提高混合料的低温抗裂性能,有效延缓路面疲劳裂缝的产生。同时,结合数值模拟技术,使用ANSYS软件,对不同纤维掺和量模型进行了分析,确定方案的优选。最后,铺设1200 m长的试验路段,建立长期的道路运营跟踪数据观测,证明方案的合理性和实用性。结果表明,在沥青混凝土中添加木质素纤维可以提高沥青混合料抗裂性能,延长道路寿命,节省养护成本。本文为该地区新建道路以及旧路修复提供了依据。
Based on the construction of a secondary road, we conduct indoor tests to determine the aggregate grading and the addition of fibers of the asphalt mixture. And we have conducted several tests on the crack resistance of the asphalt pavements with different mixing amount of fibers under low temperature. The test results show that the addition of the fibers can improve the low-temperature crack resistance of the asphalt mixture, thus the generation of the fatigue crack can be delayed. Besides, with the help of numerical simulation and the FEA software ANSYS, we have analyzed the performance of the pavement model with different mixing amount of lignin fibers, and the optimized design was carried out. Finally, a 1200m-long experimental section of high- way was constructed, which utilize the fibers to inhibit the propagation of crack. In order to testify the rational- ity and practicability of our design, we have established a long time observation of the road. The results indi- cate that the addition of fibers to the asphalt mixture can increase its crack resistance, extend the service life and reduce the maintaining cost. What is more, this on designing new road or repairing the old road. paper will offer considerable experiences to the designers
出处
《华中科技大学学报（城市科学版）》
CAS
2010年第3期31-34,共4页
Journal of Huazhong University of Science and Technology
关键词
沥青路面
粘弹性
应力强度因子
低温抗裂
试验研究
asphalt pavements
viscoelasticity
stress intensity factor
low-temperature crack resistance
experimental investigation
