沥青标号和用量对再生沥青混合料性能的影响  

Influence of Asphalt Grade and Content on the Properties of RAP Mixtures

作　　者：朱月风 司春棣[1,2,3] 乔亚宁 李彦伟 ZHU Yuefeng;SI Chundi;QIAO Yaning;LI Yanwei(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Traffic Safety and Control of Hebei Province,Shijiazhuang 050043,China;School of Traffic and Transportation,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;Hebei Provincial Communications Planning and Design Institute,Shijiazhuang 050043,China;Research and Development Center of Transport Industry of Technologies,Materials and Equipments of Highway Construction and Maintenance,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学,省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]河北省交通安全与控制重点实验室,石家庄050043 [3]石家庄铁道大学交通运输学院,石家庄050043 [4]中国矿业大学力学与土木工程学院,徐州221116 [5]河北省交通规划设计院,石家庄050043 [6]交通运输行业公路建设与养护技术材料及装备研发中心,石家庄050043

出　　处：《材料导报》2021年第6期6086-6092,共7页Materials Reports

基　　金：河北省自然科学基金项目(E2020210089);国家自然科学基金项目(11972237,12072204);河北省高等学校科学技术研究项目(QN2019234);河北省引进留学回国人员项目(C20190513,C20200)。

摘　　要：为研究新沥青标号和用量对回收沥青路面材料(RAP)再生沥青混合料性能的影响,分别选取70^(#)和90^(#)道路石油沥青,以最佳新沥青掺量(OAC)为基准,分别制备OAC、OAC+0.5%和OAC-0.5%,RAP掺量分别为0%、20%和40%的再生沥青混合料。通过沥青混合料动态模量试验、疲劳试验、低温圆盘拉伸试验和冻融循环试验分析了不同沥青混合料的性能;接着,为更好地区分不同再生沥青混合料的抗裂性能,萃取得到不同再生沥青混合料中的沥青,对沥青进行高温DSR频率扫描试验,应用G-R常数分析不同沥青的抗裂性能。结果表明:当新加沥青较软、掺量较高,而RAP掺量较低时,再生沥青混合料的抗疲劳开裂能力及抗低温抗裂能力更强;反之,当新沥青较硬,RAP掺量较高时,再生沥青混合料的硬度较高,有较好的抗车辙能力。当新加沥青为70^(#)沥青,掺量为OAC-0.5%、40%RAP时,再生沥青混合料低温性能不满足要求。水稳定性分析表明,一次冻融循环用于评价再生沥青混合料的水稳定性具有一定局限性;两次冻融循环试验表明,再生沥青混合料的水稳定性比新沥青混合料差。沥青G-R常数分析表明,低标号沥青的RAP掺量较高时,萃取的沥青更接近开裂标线,更易发生开裂行为。In order to study the influence of new asphalt grade and content on the properties of RAP mixtures,70^(#)and 90^(#)asphalt were selected to prepare the RAP mixtures with 0%,20%and 40%RAP content.Based on the optimum asphalt content(OAC)of new binder,the OAC,OAC+0.5%and OAC-0.5%content of RAP mixtures were also fabricated.Dynamic modulus test,fatigue test and low temperature disc-shape tension test were conducted to analyze the properties of RAP mixtures.Then,for better understanding the crack resistance of RAP mixtures,the binders were extracted and recovered to study the cracking properties using G-R parameters.The mixtures results show that when using soft binder,hig-her binder content and lower RAP content,the RAP mixtures have better fatigue resistance and low temperature crack resistance.On the contrary,with harder binder and higher RAP content,the RAP mixtures have better rutting resistance.However,the low temperature results show that with 70^(#)binder with OAC-0.5%and 40%RAP content,the RAP mixtures could not meet the requirement.The analysis of water stability shows that one time freeze-thaw cycle is limited to evaluate the water stability of RAP mixtures.After two time freeze-thaw cycles,the water stability of RAP mixtures is lower than that of new asphalt mixture.The G-R parameter results show that with higher RAP content and harder binder,the sextracted binders are more likely to crack.

关 键 词：沥青标号 RAP 最佳沥青用量 抗裂性能 G-R常数 

分 类 号：U416.217[交通运输工程—道路与铁道工程]