基于精细分离RAP细料的应力吸收层再生混合料性能研究  

Research on the performance of stress absorption layer regener⁃ated mixtures based on fine separation of RAP fine materials

作　　者：庄园 马辉 ZHUANG Yuan;MA Hui(Jiangsu Expressway Engineering Maintenance Technology Co.,Ltd.,Nanjing,211106,China)

机构地区：[1]江苏高速公路工程养护技术有限公司,江苏南京211106

出　　处：《现代交通与冶金材料》2024年第4期41-48,共8页Modern Transportation and Metallurgical Materials

基　　金：国家自然科学基金面上项目(522035011)。

摘　　要：精细分离技术可有效降低RAP结团,控制其变异性,但RAP在精细分离后会产生超过50%的RAP细料。由于沥青含量高及级配限制,RAP细料在常规混合料中较难再生利用,因此,亟需探索针对RAP细料的多途径利用方法。为研究精细分离RAP细料用于应力吸收层再生混合料的可行性,本文基于再生沥青性能的可恢复程度与级配可调性确定了RAP细料最大掺量,设计了0%,10%,20%三种RAP细料掺量的应力吸收层再生混合料,采用车辙试验、低温SCB试验与低温小梁弯曲试验、冻融循环状态下的SCB试验、OT试验评价了应力吸收层再生混合料的路用性能,并分析了RAP细料掺量对其性能的影响规律。结果表明:RAP细料用于应力吸收层沥青混合料的最大掺量为20%。随着RAP细料掺量的增加,混合料高温性能会有一定程度的提升,但低温抗裂性能、水稳定性和抗反射裂缝性能会略微降低,且RAP细料用于应力吸收层具有可行性。Fine separation technology can solve the problem of high variability in traditional recycled RAP,but it will produce over 50%of RAP fines during use.Due to gradation limitations,it is difficult to recycle this portion of fine material through conventional methods.Therefore,it is urgent to explore multiple utilization methods for RAP fine materials.To study the feasibility of using finely separated RAP fine aggregate for stress absorption layer recycled mixtures,this paper determines the maximum content of RAP fine aggregate based on the recoverability and gradation adjustability of recycled as⁃phalt.Three types of RAP fine aggregate content,namely 0%,10%,and 20%,are designed for stress absorption layer recycled mixtures.The performance of stress absorption layer recycled mixtures is evaluated using rutting tests,SCB tests at low temperatures,low temperature SCB test and lowtemperature small beam bending test,and OT tests.The influence of RAP fine aggregate content on performance is analyzed.The results show that the maximum dosage of RAP fine aggregate for stress absorbing layer asphalt mixture is 20%.With an increase of RAP fine material content,the hightemperature performance of the mixture will be improved to a certain extent,but the low-temperature crack resistance,water stability,and anti reflection crack performance will be slightly reduced.More⁃over,RAP fine material is feasible for use in stress absorption layers.

关 键 词：应力吸收层沥青混合料 再生技术 精细分离RAP细料 路用性能 

分 类 号：U416.217[交通运输工程—道路与铁道工程] U416.26