硅酸盐学报

碳纳米管对硅灰/水泥砂浆力学和2D-3D微结构性能的影响

单位：1.东南大学材料科学与工程学院南京211189 2.山东建筑大学土木工程学院济南250101

分类号：TU52

出版年,卷(期):页码：2014,42(10):1266-1273

DOI：10.7521/j.issn.0454－5648.2014.10.09

摘要：

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－3D microstructural 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 28d were analyzed. The 2D micrographs were determined by scanning electron microscopy, and the 3D defects 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.

基金项目：

基金项目：国家“973”环境友好型现代混凝土的基础研究项目(2009CB623200)；长江学者和创新团队发展计划项目(IRT13075)；山东省高等学校科技计划项目(J14LG01)资助。

作者简介：

第一作者：刘巧玲(1977—)，女，博士研究生。通信作者：孙　伟(1935—)，女，教授，院士。

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