碳纳米管对水泥基材料微观结构及抗碳化性能的影响研究

Study on the effect of carbon nanotubes on the microstructure and anti-carbonation properties of cement-based materials

碳纳米管是一种性能优越的新型材料,将其掺入水泥基材料中可改善材料的微观结构及耐久性能。综述了碳纳米管的成核、填充和桥联等作用特性对水泥基材料微观结构及抗碳化性能影响的研究进展,讨论了碳纳米管的掺量、分散方法和长径比对水泥基材料碳化反应的影响机理。分析表明碳纳米管以成核作用促进水泥水化,使水化产物Ca(OH)_(2)增多,基体碱性增强而使碳化变慢,并结合填充作用和桥联作用优化材料孔隙结构和界面过渡区密实度,抑制微裂缝形成,阻止CO_(2)渗入,从而优化水泥基材料微观结构,增强其抗碳化性能。最后,分析了目前研究存在的问题,并对其研究前景进行展望。

Carbon nanotubes are a new type of material with excellent properties,and their incorporation into cementitious materials can improve the microstructure and durability of the material.This paper reviews the research progress on the effect of nucleation,filling and bridging properties of carbon nanotubes on the microstructure and carbonation resistance of cementitious materials,and discusses the mechanism of the effect of the doping amount,dispersion method and length-to-diameter ratio of carbon nanotubes on the carbonation reaction of cementitious materials.The analysis shows that carbon nanotubes promote the hydration of cement by nucleation,increase the hydration product Ca(OH)_(2),increase the alkalinity of the matrix and slow down the carbonisation,and optimise the pore structure of the material and the compactness of the interfacial transition zone by combining the filling and bridging effects,inhibit the formation of microcracks and prevent the infiltration of CO_(2),thus optimising the microstructure of cement-based materials and enhancing their anti-carbonisation properties.Finally,the problems of the current research are analyzed and the prospects of its research are given.