骨料级配对稀薄沥青覆盖层抗车辙性能的影响  

The Influence of Aggregate Gradationon the Rutting Resistance Performance of Thin Asphalt Overlay

作　　者：高振富 GAO Zhenfu(The Fifth Engineering Co.,Ltd.of China Railway 18th Bureau Group,Tianjin 300451,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300451

出　　处：《长春工程学院学报（自然科学版）》2024年第1期32-37,共6页Journal of Changchun Institute of Technology：Natural Sciences Edition

摘　　要：稀薄沥青覆盖层(TAO)是一种常用的沥青路面修复技术,其抗车辙性能与骨料级配密切相关。为探究骨料级配差异对TAO混合料抗车辙性能的影响,采用AC-16沥青混合料,设计了最大公称粒径相同的3种骨料级配并对成型试件进行室内车辙试验,设计了5种不同的4.75 mm、2.36 mm通过率级配并对成型试件进行汉堡车辙试验。研究结果表明:骨料级配对TAO的抗车辙性能起着重要作用,混合料骨料级配越细,其内部骨架越难以形成,导致沥青混合料抗车辙能力降低。因此,通过在一定范围内增加粗骨料含量的方式来优化沥青混合料级配,可以明显地提升TAO的抗车辙性能。此外,增大级配4.75 mm、2.36 mm的筛孔通过率,会使沥青混合料击实空隙率减小,使汉堡车辙深度更大,导致其抗车辙能力下降;且当空隙率<4%时,汉堡车辙深度受空隙率影响更加显著;因此,在实际的工程应用中可通过减少级配4.75 mm、2.36 mm的骨料含量来大幅提升TAO的抗车辙能力。Thin asphalt overlay(TAO)is a commonly used technology for asphalt pavement rehabilitation,and its rutting resistance is closely related to the aggregate gradation.In order to investigate the effect of aggregate gradation differences on the rutting resistance of TAO mixture,AC-16 asphalt mixture is used.Three aggregate gradation with the same maximum nominal particle size are designed and indoor rutting tests are conducted on formed specimens.Five different 4.75 mm and 2.36 mm pass rate gradations are designed and Hamburg rutting tests are conducted on formed specimens.The results indicate that the aggregate gradation plays an important role in the rutting resistance of TAO,and the finer the aggregate gradation of the mixture,the more difficult it is to form the internal skeleton,resulting in a decrease in rutting resistance of the asphalt mixture.Therefore,optimizing the gradation of asphalt mixture by increasing the content of coarse aggregates within a certain range can significantly improve the rutting resistance of TAO.In addition,increasing the sieve pass rate of 4.75 mm and 2.36 mm in gradation will reduce the compaction porosity of asphalt mixture,increase the depth of Hamburg rutting,and lead to a decrease in the rutting resistance;and when the void ratio is less than 4%,the depth of Hamburg rutting is more significantly affected by the void ratio;therefore,in practical engineering applications,the rutting resistance ability of TAO can be greatly improved by reducing the aggregate content of 4.75 mm and 2.36 mm in gradation.

关 键 词：骨料级配 稀薄沥青覆盖层 最大公称粒径 汉堡车辙试验 抗车辙 

分 类 号：U414[交通运输工程—道路与铁道工程]