碳纳米管对3D打印混凝土流变性能及力学性能的影响  

Effect of Carbon Nanotubes on the Rheological and Mechanical Properties of 3D Printed Concrete

作　　者：赵宇[1] 武喜凯 朱伶俐[2] 杨章 杨若凡 管学茂[2] ZHAO Yu;WU Xikai;ZHU Lingli;YANG Zhang;YANG Ruofan;GUAN Xuemao(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《材料导报》2023年第6期109-114,共6页Materials Reports

基　　金：国家自然科学基金(U1504513,U1905216);河南省高等学校重点科研项目(22A560002)。

摘　　要：碳纳米管(MWCNTs)是一种性能优良的纳米材料,将其掺入3D打印混凝土(3DPC)中不仅会对基体内部微裂纹的生成和扩展以及3D打印混凝土的宏观力学性能产生显著影响,而且会影响新拌3D打印混凝土的流变性能。为了明确碳纳米管对3D打印混凝土性能的影响,通过设置六种碳纳米管掺量(0%、0.01%、0.02%、0.05%、0.08%、0.1%),研究了碳纳米管的掺量对3D打印凝土流变性能及力学性能的影响,并基于SEM测试结果进行了微观分析。研究结果表明:随着碳纳米管掺量的增加,3D打印混凝土的流动度逐渐下降,静态屈服应力、动态屈服应力逐渐增加。各龄期的抗折强度均随着碳纳米管掺量的增加而增大。随碳纳米管掺量的增加,3D打印混凝土的抗压强度先增大后减小,当碳纳米管掺量为0.05%时,其抗压强度最大。SEM结果显示,碳纳米管可以起到桥接和填充作用,能与基体紧密连接,阻止3D打印混凝土内部微裂缝和孔洞的生成与扩展,在较低掺量(不超过0.05%)下即能显著改善3D打印混凝土的微观结构。Carbon nanotubes(MWCNTs)are nanomaterials with excellent performance.Carbon nanotubes have a significant influence on the formation and propagation of microcracks in the matrix of 3D printed concrete(3DPC)and the macroscopic mechanical properties of 3D printed concrete.In addition,carbon nanotubes affect the rheological properties of fresh 3D printed concrete.The effect of the carbon nanotubes content on the rheological and mechanical properties of the 3D printed concrete was studied by setting 6 types of carbon nanotube content(0%,0.01%,0.02%,0.05%,0.08%,0.1%).According to the SEM test results,a microscopic analysis was carried out.The results show that with the increase of carbon nanotube content,the fluidity of 3D printed concrete gradually decreases,and the static yield stress and dynamic yield stress gradually increase.The flexural strength of 3D printed concrete rises as the increase of carbon nanotube content.The compressive strength first increases and then decreases with the increase of carbon nanotube content.When the carbon nanotube content is 0.05%,the compressive strength of the printed specimen is the largest.Carbon nanotubes can play a role of bridging and filling,and be closely connected with the matrix to prevent the formation and expansion of micro-cracks and holes.The microstructure of 3D printed concrete could be significantly improved at a lower carbon nanotube content(no more than 0.05%).

关 键 词：3D打印混凝土 碳纳米管 流变特性 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]