Effects of graphene oxide on early-age hydration and electrical resistivity of Portland cement paste

被引：260
作者：
Li, Wengui [1 ,2 ]
Li, Xiangyu [2 ,3 ]
Chen, Shu Jian [2 ]
Liu, Yan Ming [2 ]
Duan, Wen Hui [2 ]
Shah, Surendra P. [4 ]
机构：
[1] Univ Technol Sydney, Ctr Built Infrastruct Res CBIR, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia
[2] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia
[3] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China
[4] Northwestern Univ, ACBM, Ctr Adv Cement Based Mat, Dept Civil & Environm Engn, Evanston, IL 60208 USA
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2017年 / 136卷
基金：
中国国家自然科学基金; 澳大利亚研究理事会;
关键词：
Graphene oxide (GO); Hydration heat; Electrical resistivity; Mechanical strength; Microstructure; MECHANICAL-PROPERTIES; CONCRETE; MICROSTRUCTURE; COMPOSITES; SILICA; IMPACT;
D O I：
10.1016/j.conbuildmat.2017.01.066
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effects of graphene oxide (GO) on the early-age hydration process and mechanical properties of Portland cement paste were experimentally investigated in this study. Based on an isothermal calorimeter meastirement, the hydration rate of cement was observed to increase with the increase of GO content by nucleation effect. On the other hand, the electrical resistivity development of GO-cement paste was monitored using a non-contact electrical resistivity device. The result showed that electrical the resistivity of GO-cement paste was evidently higher than that of plain cement paste. However, cement paste with excessive amounts of GO exhibited a decreased electrical resistivity due to the massive ion diffusion caused by GO. Compared to plain cement paste, the GO-cement paste exhibited obviously higher compressive and flexural strengths, but the enhancements in compressive strength began to decline When the GO amount was greater than 0.04%. The microstructure characterization indicated that GO can apparently density the cement pastes with less porosity and hydrates networking, which is consistent with the results of hydration acceleration and strength enhancement. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：506 / 514
页数：9
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