Study on the High-temperature Modified Steel Slag Using Reservoir Sediment and Carbide Slag
WANG Changlong1, ZHAO Gaofei1, WANG Yongbo2,*, ZHANG Shuhua2, ZHENG Yongchao3, HUO Zekun1, WANG Shaoxi1, REN Zhenzhen1, ZOU Jiayi1
1 School of Civil Engineering, Hebei University of Engineering, Handan 056038, Hebei, China 2 Handan Jianye Construction Engineering Quality Inspection Co., Ltd., Handan 056000, Hebei, China 3 State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing Building Materials Academy of Science Research Institute Co., Ltd., Beijing 100041, China
Abstract: High-temperature modification using reservoir sediment and carbide slag was performed to study its influence on phase, structure and properties of steel slag. The physicochemical properties of raw materials, mineral constituents and microstructure of steel slag after the high-temperature modification were analyzed by X-ray fluorescence analyzer (XRF), X-ray diffraction (XRD), scanning electronic microscopy (SEM), energy dispersive spectrometry (EDS) and particle size analysis. It is found that new mineral phases such as diopside (CMS2), ceylonite (MgFe2O4), gehlenite (C2AS), tricalcium aluminate (C3A) and magnetite (Fe3O4) form in the modified steel slag. The high-temperature modification promotes the decomposition of RO phase in steel slag, in which FeO is converted to magnetite (Fe3O4) simultaneously. The high temperature modification improves the cementitious reactivity of steel slag, and effectively reduces the dosage f-CaO and f-MgO in steel slag. When the dosage of composite modifier is 20% (m(reservoir sediment):m(carbide slag)=3:1) and the treatment temperature is 1 150 ℃, the 28 d activity index of modified steel slag is 12.2% higher than that of original steel slag, reaching 82.4%, which meets the technical requirements of GB/T 20491-2017 ‘steel slag powder used in cement and concrete' that the activity index of grade I steel slag powder is greater than or equal to 80%. The mass fraction of f-CaO and f-MgO in the original steel slag decreased to 1.21% and 1.98% respectively.
王长龙, 赵高飞, 王永波, 张苏花, 郑永超, 霍泽坤, 王绍熙, 任真真, 邹佳一. 水库底泥和电石渣高温改性钢渣的研究[J]. 材料导报, 2022, 36(9): 21040178-7.
WANG Changlong, ZHAO Gaofei, WANG Yongbo, ZHANG Shuhua, ZHENG Yongchao, HUO Zekun, WANG Shaoxi, REN Zhenzhen, ZOU Jiayi. Study on the High-temperature Modified Steel Slag Using Reservoir Sediment and Carbide Slag. Materials Reports, 2022, 36(9): 21040178-7.
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2022, Vol. 36 
