高铁桥面防水层修复用乳化沥青混凝土压实性能  

Compaction Performance of Emulsified Asphalt Concrete for Repairing Waterproof Layer of High Speed Railway Bridge Deck

作　　者：张驰 李书明 郁培云 石越峰 刘竞 郑新国 邓青山 ZHANG Chi;LI Shuming;YU Peiyun;SHI Yuefeng;LIU Jing;ZHENG Xinguo;DENG Qingshan(Railway Engineering Research Institute,CARS,Beijing 100081,China;State Key Laboratory for Track System of High-speed Railway,Beijing 100081,China;Beijing Tieke Special Engineering Technology Co.Ltd.,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道系统全国重点实验室,北京100081 [3]北京铁科特种工程技术有限公司,北京100081

出　　处：《铁道建筑》2024年第4期112-117,共6页Railway Engineering

基　　金：国家重点研发计划(2022YFB2603305);中国铁道科学研究院集团有限公司基金(2023YJ189)。

摘　　要：为探索高铁桥面防水层冻融粉化修复用乳化沥青混凝土的防水性能和力学性能,考虑无砟轨道天窗维修条件,对比分析了重压实、轻压实、免压实乳化沥青混凝土的密实防水性、劈裂强度、抗冻融性及强度发展规律。结果表明:达到相同密实防水状态时,轻压实和免压实试件的液体用量高于重压实试件。免压实试件空隙率略高于轻压实和重压实试件,免压实试件细、中级配防水性良好,粗级配防水性差。免压实试件马歇尔稳定度小于重压实和轻压实试件,但劈裂强度和冻融劈裂强度大于重压实和轻压实试件。免压实试件失水率低于重压实和轻压实试件,尤其在养护初期。重压实和轻压实试件养生1 d满足承受正常车辆荷载的要求,免压实试件养生3 d满足承受行人荷载的要求,养生5 d时满足承受正常车辆荷载的要求。In order to explore the waterproof and mechanical performance of emulsified asphalt concrete used for freezethaw powdering repair of high speed railway bridge deck waterproof layer,considering the skylight maintenance conditions of ballastless track,the waterproofing,splitting strength,freeze-thaw resistance,and strength development law of emulsified asphalt concrete with heavy compaction,light compaction,and free compaction were analyzed.The results show that when reaching the same compaction state,the liquid dosage of light compacted and free compacted specimens is higher than that of heavy compacted specimens.The porosity of the free compacted specimens is slightly higher than that of light and heavy compacted specimens.The fine and intermediate gradation of free compacted specimens have good waterproofing performance,while the coarse gradation has poor waterproofing performance.The Marshall stability of free compacted specimens is lower than that of heavy and light compacted specimens,but the splitting strength and freeze-thaw strength are greater than those of heavy and light compacted specimens.The water loss rate of free compacted specimens is lower than that of heavy and light compacted specimens,especially in the early stage of curing.The heavy and light compacted specimens are cured for 1 day to meet the normal vehicle load requirements,while free compacted specimens meet the requirements for bearing pedestrian loads after 3 days of curing and normal vehicle load requirements after 5 days of curing.

关 键 词：高铁桥面防水层 乳化沥青混凝土 免压实 防水性 冻融劈裂 

分 类 号：U443.31[建筑科学—桥梁与隧道工程] TU528.42[交通运输工程—道路与铁道工程]