The role of admixed graphene oxide in a cement hydration system

被引：113

作者：

Xu, Gang ^{[1
]}

Du, Sen ^{[1
]}

He, Jialuo ^{[1
]}

Shi, Xianming ^{[1
]}

机构：

[1] Washington State Univ, Dept Civil & Environm Engn, Lab Adv & Sustainable Cementitious Mat, Pullman, WA 99164 USA

来源：

CARBON | 2019年 / 148卷

关键词：

Graphene oxide; Cement; Compressive strength (P); Calcium silicate hydrate (C-S-H); Microstructure; C-S-H; FLY-ASH; PORTLAND-CEMENT; MECHANICAL-PROPERTIES; MICROSTRUCTURE; STRENGTH; COMPOSITES; NANOSHEETS; MODELS; IMPACT;

D O I：

10.1016/j.carbon.2019.03.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphene oxide (GO), which has been sucessfully used in cement composites as an admixture, can improve their mechanical and durability properties. This study examined and elucidated the effect of GO on the hydration products of a cement system in detail. The hydration precursors, morphology, composition, and chemical bonds of cement pastes were studied by SEM/BSE, XRD, LA-ICP-MS, and Si-29/Al-27 MAS-NMR, respectively. The experimental results indicated that the 28-day compressive strength of cement pastes (w/c = 0.35) was increased by 29% when admixing 0.02 wt% GO. There existed chemical reactions between the admixed GO and the cement hydration products. The improved strength actually was not only attributed to the improved hydration degree of cement, but also the newly found tobermorite-like hydrates and jennite-like hydrates due to the Ca ions consumption by the negatively charged GO. The polymerization of hydration products was also improved due to the addition of GO. Published by Elsevier Ltd.

引用

页码：141 / 150

页数：10

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