An investigation into the colloidal stability of graphene oxide nano-layers in alite paste

被引：86

作者：

Ghazizadeh, S. ^{[1
]}

Duffour, P. ^{[1
]}

Skipper, N. T. ^{[2
]}

Billing, M. ^{[2
]}

Bai, Y. ^{[1
]}

机构：

[1] UCL, Dept Civil Environm & Geomat Engn, London WC1E 6BT, England

[2] UCL, Dept Phys & Astron, London Ctr Nanotechnol, London WC1E 6BT, England

来源：

CEMENT AND CONCRETE RESEARCH | 2017年 / 99卷

关键词：

Colloidal stability; Graphene oxide; Alite; Portland cement; MECHANICAL-PROPERTIES; TRICALCIUM SILICATE; HYDRATION KINETICS; AQUEOUS-SOLUTIONS; CEMENT; MICROSTRUCTURE; NANOSHEETS; DYNAMICS; WATER; AGGREGATION;

D O I：

10.1016/j.cemconres.2017.05.011

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Recent studies have reported that graphene oxide (GO) is capable of enhancing the mechanical properties of hardened Portland cement (PC) pastes. The mechanisms proposed so far to explain this strengthening generally assume that GO is well dispersed in the pore solution of PC paste, serving as a reinforcing agent or nucleation growth site during hydration. This paper investigates (i) the effect of GO on the hydration of alite, the main constituent of PC cement, using isothermal calorimetry and boundary nucleation-growth modelling, and (ii) the factors controlling the colloidal stability of GO in alite paste environment. Results indicate that GO accelerates the hydration of alite only marginally, and that GO is susceptible to aggregation in alite paste. This instability is due to (i) a pH-dependent interaction between GO and calcium cations in the pore solution of alite paste, and (ii) a significant reduction of GO functional groups at high pH.

引用

页码：116 / 128

页数：13

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