Corrosion Resistance of Shaft Wall Concrete in Ultra-deep Wells Under Sulphate Wet and Dry Cycling Environment
LIU Juanhong1,2,3, MA Hongbo1, DUAN Pinjia4, ZHOU Yucheng1, GUO Zidong1
1 College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083,China 2 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083,China 3 State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083,China 4 China National Offshore Oil and Gas Group Co., Ltd., Beijing 100028,China
Abstract: To solve the problem of mine ultra-deep shaft lining concrete damaged by the sulfate corrosion of groundwater,the BaSO4 precipitation, determination of chloride ion diffusion coefficient, scanning electron microscopy (SEM) image analysis, X-ray diffraction (XRD) analysis were adopted in this study. The parameters of C70 imitation steel fiber reinforced concrete (C70-ISFRC) and high performance ultra-deep shaft lining concrete (HUC) in the environment of sulfate wet-dry cycle were compared.The results show that the number and size of pores of C70-ISFRC are higher than HUC through mass change. The changing trend of mechanical properties increases first and then decreases, but the mechanical properties of HUC are better. Under the sulfate dry-wet cycle, the permeability evaluation of C70-ISFRC is low based on electric flux, and that of HUC is extremely low. After 240 sulfate dry-wet cycles, there was little liquid phase sulfate ion at 10—15 mm and 15—20 mm below the HUC surface. Compared with C70-ISFRC, HUC is not easy to form ettringite and sodium sulfate crystals in the sulfate dry-wet cycle environment, and it is not easy to deteriorate such as cracking and crystal damage. Therefore, HUC is an effective concrete material for deep well environment.
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2021, Vol. 35 
