Effects of colloidal nanoSiO2 on fly ash hydration

被引:218
作者
Hou, Pengkun [1 ,2 ]
Wang, Kejin [3 ]
Qian, Jueshi [1 ]
Kawashima, Shiho [2 ]
Kong, Deyu [2 ,4 ]
Shah, Surendra P. [2 ]
机构
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400045, Peoples R China
[2] Northwestern Univ, Dept Civil & Environm Engn, Evanston, IL 60208 USA
[3] Iowa State Univ, Dept Civil Construct & Environm Engn, Ames, IA 50011 USA
[4] Zhejiang Univ Technol, Coll Architecture & Civil Engn, Hangzhou 310014, Zhejiang, Peoples R China
关键词
Nanosio(2); Fly ash; Hydration; Morphology; Coating; C-S-H; MECHANICAL-PROPERTIES; STRENGTH DEVELOPMENT; TRICALCIUM SILICATE; POZZOLANIC REACTION; BLENDED CEMENTS; ACTIVATION; NANO-SIO2; MICROSTRUCTURE; TEMPERATURE;
D O I
10.1016/j.cemconcomp.2012.06.013
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The influences of colloidal nanoSiO(2) (CNS) addition on fly ash hydration and microstructure development of cement-fly ash pastes were investigated. The results revealed that fly ash hydration is accelerated by CNS at early age thus enhancing the early age strength of the materials. However, the pozzolanic reaction of fly ash at later age is significantly hindered due to the reduced CH content resulting from CNS hydration and the hindered cement hydration, as well as due to a layer of dense, low Ca/Si hydrate coating around fly ash particles. The results and discussions explain why the cementitious materials containing nanoSiO(2) had a lower strength gain at later ages. Methods of mitigating the adverse effect of nanoSiO(2) on cement/FA hydration at later ages were proposed. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1095 / 1103
页数:9
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