多壁碳纳米管增强混凝土的断裂性能  

Fracture Properties of Multi-Walled Carbon Nanotubes Reinforced Concrete

作　　者：郑冰淼 陈嘉琪 施韬[1,4] 刘艳明 徐锦皓 葛楠 赵启帆 邵晓俊 ZHENG Bingmiao;CHEN Jiaqi;SHI Tao;LIU Yanming;XU Jinhao;GE Nan;ZHAO Qifan;SHAO Xiaojun(College of Civil Engineering,Zhejiang University Of Technology,Hangzhou 310023,China;Zhejiang Scientific Research Institute of Transport,Hangzhou 311305,China;Zheyiang Provincial Key Lab for Detection and Maintenance Technology of Road and Birdge,Hangzhou 311305,China;Key Laboratory of Civil Engineering Structure&Disaster Prevention and Mitigation Technology of Zhejiang Province,Hangzhou 310023,China;Hangzhou LiAo Commercial Concrete Co.,Ltd.,Hangzhou 311122,China)

机构地区：[1]浙江工业大学土木工程学院,杭州310023 [2]浙江省交通运输科学研究院,杭州311305 [3]浙江省道桥检测与养护技术研究重点实验室,杭州311305 [4]浙江省工程结构与防灾减灾技术研究重点实验室,杭州310023 [5]杭州力澳商品混凝土有限公司,杭州311122

出　　处：《硅酸盐学报》2021年第11期2502-2508,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52078460,51778582);硅酸盐建筑材料国家重点实验室开放基金重点项目(SYSJJ2020-06)。

摘　　要：将多壁碳纳米管(MWCNTs)掺入混凝土中能提高混凝土的断裂韧性。通过带预制裂缝的三点弯曲梁断裂试验对MWCNTs增强混凝土的断裂性能进行了研究,采用双K断裂参数分析了MWCNTs增强混凝土的断裂性能。结果表明:MWCNTs提高了混凝土的断裂韧性。当MWCNTs的掺量为0.10%(占水泥的质量分数)时,混凝土的28 d抗压强度和劈裂抗拉强度分别提高了1.7%和11.7%;当MWCNTs的掺量为0.15%时,混凝土的起裂韧度、失稳韧度和断裂能分别提高了31.0%、32.4%和24.6%。MWCNTs主要通过桥接混凝土里的微裂缝和增强骨料界面过渡区,延缓微裂缝的扩展。Incorporating multi-walled carbon nanotubes(MWCNTs) into concrete can improve the fracture toughness of concrete.The fracture properties of MWCNTs reinforced concrete were examined via three-point bending beam fracture tests. The fracture parameters of MWCNTs reinforced concrete were analyzed by using the double K fracture parameters. The results show that MWCNTs can improve the fracture toughness of concrete. When the content of MWCNTs is 0.10%, the 28-d compressive strength and splitting tensile strength of concrete are increased by 1.7% and 11.7%, respectively. When the content of MWCNTs is 0.15%, the initial fracture toughness, unstable fracture toughness and fracture energy of concrete are increased by 31.0%, 32.4% and 24.6%,respectively. It is indicated that MWCNTs delay the propagation of micro-cracks by bridging across the micro-cracks in concrete and strengthening the interfacial transition zone.

关 键 词：混凝土 碳纳米管 断裂性能 微观结构 双K断裂参数 断裂能 

分 类 号：TU528[建筑科学—建筑技术科学]