掺沥青路面回收料再生水泥混凝土抗冻性能研究  

Research on Freeze-thaw Performance of Recycled Cement Concrete with Reclaimed Asphalt Pavement

作　　者：边伟 高晋彪 张艳聪 贾嘉豪 黄斐 BIAN Wei;GAO Jin-biao;ZHANG Yan-cong;JIA Jia-hao;HUANG Fei(Shanxi Transportation Technology Research&Development Co.Ltd.,Taiyuan 030032,China;Key Laboratory of Highway Construction&Maintenance Technology in Loess Region,Taiyuan 030032,China;Shanxi Dacheng Expressway Co.Ltd.,Xinzhou 034209,China)

机构地区：[1]山西省交通科技研发有限公司,太原市030032 [2]黄土地区公路建设与养护技术交通行业重点实验室,太原市030032 [3]山西大成高速公路有限公司,忻州市034209

出　　处：《公路》2024年第1期48-52,共5页Highway

基　　金：山西省基础研究计划项目,项目编号20210302124457;山西省交通运输厅科技项目,项目编号2020-1-8、2020-1-9;山西交通控股集团有限公司科技项目,项目编号20-JKKJ-53;山西交通科学研究院集团有限公司创新发展计划项目,项目编号21-JKCF-54。

摘　　要：为研究掺沥青路面回收料(RAP)再生水泥混凝土的抗冻性能,采用慢冻法研究了冻融循环下RAP掺量(20%、30%、40%、50%)和水灰比(0.4、0.5、0.6、0.7)对再生水泥混凝土外观形貌和抗压强度损失率的影响。结果表明:在冻融循环下,掺沥青路面回收料再生水泥混凝土外观形貌表现出表面裂缝出现-裂缝延伸扩展-裂缝遍布表面-表面浆体胀落-试件彻底解体等发展历程。冻融早期再生水泥混凝土的抗压强度损失较为缓慢,随着冻融次数的不断增加,再生水泥混凝土的强度损失速度也随之加快。随着RAP掺量和水灰比增大,再生水泥混凝土抗压强度损失率随之增大,冻胀解体时承受的循环次数随之减小,抗冻性能随之减弱。In order to study the freeze-thaw performance of recycled cement concrete with reclaimed asphalt pavement(RAP-RCC),the freeze-thaw cycle test of RAP-RCC is carried out by slow freezing method.The effects of RAP content(20%,30%,40%,and 50%)and water-cement ratio(0.4,0.5,0.6,and 0.7)on the appearance and compressive strength loss rate of RAP-RCC are studied.The results show that under the condition of freeze-thaw cycle,cracks first appear on the surface of RAP-RCC,then the cracks extend and expand until they spread throughout the entire surface,and then the surface slurry begins to swell until the specimen is completely disintegrated.The strength loss of RAP-RCC is slow in the early stage of freeze-thaw,and the strength loss rate of RAP-RCC increases with the increase of freezethaw cycles.With the increase of RAP content and water-cement ratio,the compressive strength loss rate of RAP-RCC increases,the number of freeze-thaw cycles that RAP-RCC can withstand before disintegration decreases,and the freeze-resistance performance weakens.

关 键 词：道路工程 再生水泥混凝土 冻融循环 沥青路面回收料掺量 水灰比 抗压强度损失率 

分 类 号：U416.216[交通运输工程—道路与铁道工程] TU528.37[建筑科学—建筑技术科学]