摘要
针对传统铁路隧道韧性不足的问题,提出通过钢纤维和碳纳米管对混凝土进行协同改性,增加混凝土的韧性。试验首先分析了钢纤维碳纳米管混凝土的基础性能,然后对其在铁路隧道的应用进行研究。试验结果表明,钢纤维掺量为2%,碳纳米管掺量为0.1%时,对混凝土的增强效果最佳。此时,钢纤维碳纳米管的坍落度为160 mm,抗压强度约为66.7 MPa,抗折强度约为10.5 MPa,初裂冲击次数和终裂冲击次数分别为284次和391次,破坏形态为塑性破坏,综合性能良好。将其在铁路深埋隧道中进行应用,各龄期底板侧墙和顶板结构的外观质量完整,未出现贯穿裂缝,表现出良好的应用效果。
In response to the problem of insufficient toughness in traditional railway tunnels,it was proposed to synergistically modify concrete with steel fibers and carbon nanotubes to increase its toughness.The experiment first analyzed the basic properties of steel fiber carbon nanotube concrete,and then studied its application in railway tunnels.The experimental results showed that when the steel fiber content was 2%and the carbon nanotube content was 0.1%,the reinforcement effect on concrete was the best.At this point,the slump of the steel fiber carbon nanotube was 160 mm,the compressive strength was about 66.7 MPa,the flexural strength was about 10.5 MPa,and the number of initial and final crack impacts was 284 and 391,respectively.The failure mode was plastic failure,and the overall performance was good.When it was applied in the railway deep buried tunnel,the appearance quality of each structure was complete,and there was no through crack,showing good application effect.
作者
杨朝帅
郭小雄
钟炬柱
吴成龙
YANG Chaoshuai;GUO Xiaoxiong;ZHONG Juzhu;WU Chenglong(China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458,China;Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure,Guangzhou 511458,China;China Academy of Railway Sciences Co.,Ltd.,Beijing 100081,China;State Key Laboratory of High Speed Railway Track Technology,Beijing 100081,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong China)
出处
《粘接》
CAS
2024年第11期117-120,共4页
Adhesion
基金
中国中铁股份有限公司科技研究开发计划项目(项目编号:cz02-专项-02)
中铁隧道局集团科技创新计划项目(项目编号:隧研合2022-03)。
关键词
铁路隧道混凝土
高性能混凝土
增韧效果
抗冲击性能
concrete for railway tunnels
high performance concrete
toughening effect
impact resistance
