摘要
为提高沥青路面就地热再生沥青混合料的抗滑性能和路用性能,以江苏省G40扬宁高速公路二次就地热再生养护工程为案例,对其混合料配合比进行优化设计。通过调查旧沥青路面回收料(RAP)和路面状况,掌握RAP的级配组成及沥青老化程度,并根据调查结果开展沥青路面二次就地热再生混合料级配优化设计。结果表明,RAP料的级配偏细,回收沥青的老化程度为Ⅱ级,满足再生要求;新拌沥青混合料与RAP料掺加比例为30%和70%,再生剂的掺量为RAP旧沥青的3%,再生混合料合成油石比为5.8%,其路用性能满足再生沥青混合料规范要求;此外,添加强韧化玄武岩纤维后,二次再生混合料的高温、低温及抗滑耐久性能均得到了大幅提升。
In order to improve the quality of geothermal recycled asphalt mixture on asphalt pavement and optimize the mix proportion design,taking the G40 Yangning Expressway in Jiangsu Province as an actual engineering case,an investigation was conducted on the recycled asphalt pavement(RAP)and pavement conditions.The grading composition and asphalt aging degree of RAP were mastered,and based on the investigation results,the grading optimization design of geothermal recycled asphalt mixture on asphalt pavement was carried out.And through the extraction and screening of RAP material,it was found that the grading of RAP material is relatively fine,and the aging degree of recycled asphalt is Grade II,meeting the regeneration requirements.The proportion of adding external asphalt mixture and RAP material is 30%and 70%,respectively.The amount of recycled agent is 3%of RAP asphalt,and the proportion of adding new asphalt is 5.8%of recycled mixture.And by adding strong and toughened basalt fibers,the anti slip performance of the mixture is improved.The performance of the recycled asphalt mixture optimized by mix proportion design meets the requirements and has good road performance.
作者
袁青泉
王伟伟
王其林
王宇
YUAN Qing-quan;WANG Wei-wei;WANG Qi-lin;WANG Yu(Jiangsu Jinghu Expressway Co.,Ltd.,Huai′an 223005,China;Jiangsu Lianxu Expressway Co.,Ltd.,Xuzhou 221111,China;Jiangsu Expressway Engineering Maintenance Co.,Ltd.,Huai′an 223005,China;School of Architecture Science and Engineering,Yangzhou University,Yangzhou 225127,China)
出处
《价值工程》
2023年第30期59-62,共4页
Value Engineering
关键词
二次就地热再生
抗滑提升
配合比设计
强韧化玄武岩纤维
secondary geothermal regeneration
anti-slip improvement
mix proportion design
toughened basalt fiber
