Effect of basicity on cementitious activity of modified electric arc furnace steel slag

被引：10
|
作者：
Lu, Xiang [1 ,2 ]
Dai, Wenbin [3 ]
Liu, Xiaoming [1 ]
Cang, Daqiang [1 ]
Zhou, Liang [2 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
[2] MCC, Iron & Steel Design & Res Inst, HUATIAN Engn & Technol Corp, Nanjing 210019, Jiangsu, Peoples R China
[3] Beijing Bldg Mat Acad Sci Res, State Key Lab Solid Waste Reuse Bldg Mat, Beijing 100041, Peoples R China
来源：
METALLURGICAL RESEARCH & TECHNOLOGY | 2019年 / 116卷 / 02期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
modified steel slag; blended cement; basicity; cementitious activity; structural features; HYDRATION; TEMPERATURE; AGGREGATE; GGBS;
D O I：
10.1051/metal/2018069
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Electric arc furnace steel slag was modified by wastes in hot-stage process with the aim to improve the cementitious activity. Effect of basicity on cementitious activity of modified steel slag was investigated in this research. The modified slag was characterized by XRD, DTA and Raman spectra techniques to investigate the correlations between structural features and the cementitious activity. The results showed that modified steel slag with a basicity index of 1.67 possessed the highest activity index, 107%, due to the precipitation of Belite, high content of amorphous phase and low polymerization degree. The polymerization degree of modified slag was demonstrated by nonbridging oxygen per tetrahedrally coordinated cations value which was calculated through curve-fitted Raman spectra. The value of modified slag increased as the basicity promoted from 1.05 to 1.67, indicating a lower degree of polymerization. Modified slag with a basicity index of 1.86 possessed the poor cementitious activity mainly because of the significant decrease of glass phase content.
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收藏
页数：7
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