Improvement on sulfate resistance of blended cement with high alumina slag

被引：62

作者：

Ogawa, S. ^{[1
]}

Nozaki, T. ^{[1
]}

Yamada, K. ^{[2
]}

Hirao, H. ^{[1
]}

Hooton, R. D. ^{[3
]}

机构：

[1] Taiheiyo Cement Corp, R&D Ctr, Sakura, Chiba, Japan

[2] Taiheiyo Consultant Co Ltd, Sakura, Chiba, Japan

[3] Univ Toronto, Dept Civil Engn, Toronto, ON, Canada

来源：

CEMENT AND CONCRETE RESEARCH | 2012年 / 42卷 / 02期

关键词：

Sulfate resistant cements; Ettringite; Granulated blast-furnace slag; CaCO3; Calcium sulfate; BLAST-FURNACE SLAG; STRENGTH DEVELOPMENT;

D O I：

10.1016/j.cemconres.2011.09.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper is focused on the effect of limestone and calcium sulfate content on sulfate resistance of ground granulated blast furnace slag (GGBS) blended cement. Sulfate resistance was evaluated using ASTM C 1012, and a variety of mechanisms of the sulfate resistance of GGBS blended cement were revealed by the analyses of hydration products and sulfate ion ingress. Although GGBS suppresses sulfate ion ingress, it is probable that alumina in GGBS tends to form ettringite with externally supplied sulfate ions. Addition of limestone and increase in calcium sulfate content allow both monocarboaluminate and ettringite to form prior to immersion in sulfate solution. These hydration products remain in the hardened cement matrix and act to suppress further formation of ettringite with external sulfate ions during immersion in sulfate solution. GGBS blended cement with a suitable amount of limestone powder and a controlled content of calcium sulfate exhibits markedly long term sulfate resistance. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：244 / 251

页数：8

共 17 条

[1] Strength development of mortars containing ground granulated blast-furnace slag: Effect of curing temperature and determination of apparent activation energies [J].