碳纳米管对硅灰/水泥砂浆力学和2D-3D微结构性能的影响(英文)

Effect of Carbon Nanotube on Mechanical and 2D-3D Microstructure Properties of Cement Mortars with Silica Fume

为了研究碳纳米管对硅灰/水泥砂浆力学性能及2D和3D微结构的影响。采用扫描电子显微镜测试了砂浆的2D空间形貌,并首次运用X射线计算机断层扫描技术对碳纳米管增强硅灰/水泥砂浆体系的3D缺陷进行了表征,同时探讨了砂浆28d龄期的断裂韧性和耐磨性等力学性能的变化规律。结果表明,碳纳米管显著提高了砂浆的断裂韧性和耐磨性,改善了基体的微观结构,硅灰的加入有利于碳纳米管在基体中的分散和增强效应的发挥。

Effect of multi-wall carbon nanotubes(MWCNTs)on the mechanical and 2D-3Dmicrostructural properties of cementitious materials(i.e.,cement or cement/silica fume mortars)was investigated.The fracture toughness and wear resistance performance of cement mortars at the age of 28 dwere analyzed.The 2Dmicrographs were determined by scanning electron microscopy,and the 3Ddefects distribution was determined by X-ray computed tomography.The addition of MWCNTs into cement mortars can improve the fracture toughness,wear resistance and microstructure.Those properties were also enhanced by the incorporation of silica fume.