Influence of slag chemistry on the hydration of alkali-activated blast-furnace slag - Part II: Effect of Al2O3

被引：426

作者：

Ben Haha, M. ^{[1
]}

Lothenbach, B. ^{[1
]}

Le Saout, G. ^{[1
]}

Winnefeld, F. ^{[1
]}

机构：

[1] Empa, Swiss Fed Labs Mat Sci & Technol, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland

来源：

CEMENT AND CONCRETE RESEARCH | 2012年 / 42卷 / 01期

关键词：

Alkali activated slags; Al2O3; content; Hydration; Microstructure; Hydrotalcite; CALCIUM SILICATE HYDRATE; C-S-H; STRENGTH BEHAVIOR; GLASS DISSOLUTION; CRYSTAL-STRUCTURE; PORTLAND-CEMENT; PORE SOLUTION; AL-27; NMR; SI-29; MICROSTRUCTURE;

D O I：

10.1016/j.cemconres.2011.08.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The hydration and microstructural evolution of three alkali activated slags (AAS) with Al2O3 contents between 7 and 17%wt.% have been investigated. The slags were hydrated in the presence of two different alkaline activators, NaOH and Na2SiO3 center dot 5H(2)O. The formation of C(-A)-S-H and hydrotalcite was observed in all samples by X-ray diffraction, thermal analysis and scanning electron microscopy. Higher Al2O3 content of the slag decreased the Mg/Al ratio of hydrotalcite, increased the Al incorporation in the C(-A)-S-H and led to the formation of stratlingite. Increasing Al2O3 content of the slag slowed down the early hydration and a lower compressive strength during the first days was observed. At 28 days and longer, no significant effects of slag Al2O3 content on the degree of hydration, the volume of the hydrates, the coarse porosity or on the compressive strengths were observed. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：74 / 83

页数：10

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