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《Journal of Central South University(Science and Technology)》 2017-09
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Experimental study on copper slag activity excitation and hydration mechanism analysis

WU Aixiang;JIANG Guanzhao;LAN Wentao;LIU Juanhong;XUE Yang;Key Laboratory of High-Efficient Mining and Safety of Metal Mines,Ministry of Education,University of Science and Technology Beijing;School of Civil and Environmental Engineering,University of Science and Technology Beijing;  
In order to realize the recycling of copper slag, copper slag cementitious material was prepared by the way of mechanical activation and alkali activation, and the hydration mechanism of copper slag was analyzed by XRD, SEM, EDS and slag vitreous phase structure model. The results show that when the specific surface area of slag is 520 m~2/kg, 7 d strength and 28 d strength of copper slag paste specimen reach 2.4 MPa and 3.3 MPa, respectively. When cement sand ratio is 1:1, 7 d and 28 d strength of copper slag tailings filling reach 0.7 MPa and 1.0 MPa, respectively, meeting the requirements of local mine filling. In the early stage of hydration, the calcium-rich phase and high calcium lime generates calcium hydroxide, which further forms C-S-H gel and other hydration products with silicon-rich phase. As the hydration reaction continues, the internal pores of sample are filled with hydration products and gradually shrink into hole type, and the structure becomes denser.
【Fund】: 国家自然科学基金资助项目(51374034 51304011 51374035);; 国家“十二五”科技支撑计划项目(2012BAB08B02)~~
【CateGory Index】: TQ177
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