A discussion on improving hydration activity of steel slag by altering its mineral compositions

被引：207

作者：

Wang, Qiang ^{[1
]}

Yan, Peiyu ^{[1
]}

Feng, Jianwen ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Civil Engn, Beijing 100084, Peoples R China

[2] Swansea Univ, Dept Engn, Swansea SA2 8PP, W Glam, Wales

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 186卷 / 2-3期

基金：

北京市自然科学基金;

关键词：

Steel slag; Hydration; Mineral phases; Activity; AGGREGATE;

D O I：

10.1016/j.jhazmat.2010.11.109

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study aims to investigate the ways to improve the cementitious properties of steel slag. The results show that the cementitious phase of steel slag is composed of silicate and aluminate, but the large particles of these phases make a very small contribution to the cementitious properties of steel slag. RO phase (CaO-FeO-MnO-MgO solid solution), Fe3O4. C2F and f-CaO make no contribution to the cementitious properties of steel slag. A new kind of steel slag with more cementitious phase and less RO phase can be obtained by removing some large particles. This new steel slag possesses better cementitious properties than the original steel slag. The large particles can be used as fine aggregates for concrete. Adding regulating agent high in CaO and SiO2 during manufacturing process of steel slag to increase the cementitious phase to inert phase ratio is another way to improve its cementitious properties. The regulating agent should be selected to adapt to the specific steel slag and the alkalinity should be increased as high as possible on the premise that the f-CaO content does not increase. The cooling rate should be enhanced to improve the hydration activity of the cementitious phase at the early ages and the grindability of steel slag. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1070 / 1075

页数：6

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