文章摘要
彭波,童晓莹,曹宁,范学勇,田宇航.贫沥青碎石缓解层抗裂效果与路用性能研究[J].,2018,58(4):385-391
贫沥青碎石缓解层抗裂效果与路用性能研究
Research on anti-cracking and road performance of lean asphalt gravel intermediate structural layer
  
DOI:10.7511/dllgxb201804008
中文关键词: 贫沥青碎石  半刚性路面  反射裂缝  抗裂试验  评价指标  路用性能
英文关键词: lean asphalt gravel  semi-rigid pavement  reflective crack  crack resistance test  evaluation index  road performance
基金项目:陕西省自然科学基金资助项目(2011JM7001);陕西省交通厅科技计划项目(15-08K);甘肃省交通运输厅科研项目(201227).
作者单位
彭波,童晓莹,曹宁,范学勇,田宇航  
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中文摘要:
      采用新型材料贫沥青碎石(LAG)作为缓解层以有效解决半刚性基层路面易产生反射裂缝的问题.为研究其抗裂效果,通过模拟实际道路中车轮作用,开发出一种简单易行的抗裂性能试验方法.以开裂寿命、断裂寿命和裂缝发展速率作为抗反射裂缝能力评价指标,分析不同沥青用量的贫沥青碎石和其他3种不同抗裂材料的抗裂效果,进一步选取抗变形、渗水性能和抗冲刷能力进行路用性能验证.结果表明:材料开裂后,在开裂和断裂寿命基础上采用裂缝发展速率评价抗裂效果更直观合理;贫沥青碎石在最佳沥青用量下抗反射裂缝能力最优,6种材料抗裂效果依次为LAG2>LAG3>LAG1>ATB-25>ATPB-25>AC-25;贫沥青碎石各项路用性能指标均符合要求,可作为半刚性路面缓解层来延长道路使用寿命.
英文摘要:
      To effectively solve the semi-rigid pavement prone to reflective cracking problems, a kind of new material lean asphalt gravel (LAG) was proposed as the intermediate structural layer. In order to study its anti-cracking effect, a simple test method was developed by simulating the wheel function on the actual road. As the evaluation index of anti-reflection crack ability with cracking life, fracture life and crack development rate, the anti-cracking effects under different asphalt contents of lean asphalt gravel and other three crack resistance materials were analyzed, furthermore, the anti-deformation, water seepage performance and anti-scour ability were selected for road performance verification. The results show that after the material cracks, it′s more intuitive to use the crack development rate to evaluate the effect based on cracking and fracture life. The anti-reflective crack ability of lean asphalt gravel is optimal in the optimum asphalt content, and the anti-reflective crack abilities of six materials in turn are LAG2>LAG3>LAG1>ATB-25>ATPB-25>AC-25. The road performance indexes of lean asphalt gravels are all in accordance with the requirements, so they can be used as intermediate structural layer of semi-rigid pavement to prolong the life of the road.
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