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

来源：

CEMENT & CONCRETE COMPOSITES | 2012年 / 34卷 / 10期

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

页码：1095 / 1103

页数：9

共 52 条

[1] Hydration of tricalcium silicate in the presence of synthetic calcium-silicate-hydrate [J].

Alizadeh, Rouhollah ;

Raki, Laila ;

Makar, Jon M. ;

Beaudoin, James J. ;

Moudrakovski, Igor .

JOURNAL OF MATERIALS CHEMISTRY, 2009, 19 (42) :7937-7946

[2]

[Anonymous], 2008, C10908 ASTM INT

[3]

[Anonymous], 2008, C3052011 ASTM INT

[4] Heat evolution of high-volume fly ash concrete [J].

Atis, CD .

CEMENT AND CONCRETE RESEARCH, 2002, 32 (05) :751-756

[5]

Babaian PM, 2003, ACI MATER J, V100, P55

[6] CEMENT TUBULES - ANOTHER LOOK [J].

BARNES, P ;

GHOSE, A ;

MACKAY, AL .

CEMENT AND CONCRETE RESEARCH, 1980, 10 (05) :639-645

[7] EFFECT OF CURING TEMPERATURE ON THE PORE STRUCTURE OF TRICALCIUM SILICATE PASTES [J].

BENTUR, A .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1980, 74 (02) :549-560

[8] STUDIES OF THE GROWTH OF SILICATE GARDENS AND RELATED PHENOMENA [J].

COATMAN, RD ;

THOMAS, NL ;

DOUBLE, DD .

JOURNAL OF MATERIALS SCIENCE, 1980, 15 (08) :2017-2026

[9] HYDRATION OF PORTLAND-CEMENT [J].

DOUBLE, DD ;

HELLAWELL, A .

NATURE, 1976, 261 (5560) :486-488

[10] Effect of temperature on the hydration of the main clinker phases in Portland cements: Part I, neat cements [J].

Escalante-Garcia, JI ;

Sharp, JH .

CEMENT AND CONCRETE RESEARCH, 1998, 28 (09) :1245-1257

← 1 2 3 4 5 6 →