Damage Evolution of Shotcrete Lining Under Salt-lake-brine Attack
WANG Jiabin1, NIU Ditao2,3
1 School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021 2 College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055 3 National Key Laboratory of Green Building in West China, Xi’an University of Architecture and Technology, Xi’an 710055
Abstract: Salt lake is widely distributed in Western China. The high concentrations of chlorine salt, sulfate, and magnesium salt in the soil and underground water are the major reasons leading to the damage evolution of lining shotcrete and reliability of lining structure decreased. In order to research the damage appearing and evolution laws of shotcrete lining in brine corrosion environment, by using dry-wet cycle (D & W) method for simulating the corrosion mode of tunnel lining, the shotcrete durability experiment was carried out in 5% Na2SO4+5% MgSO4+3.5% NaCl solution. Mineral composition and microscope of corrosion products, and ions content were tested by using XRD, TG-DSC, SEM & EDX and electrochemical method, respectively. Acid-soluble sulfate content obviously increased with the increase of D & W cycle, and water-soluble chloride and sodium content slowly increased. However, calcium content and concrete pH value decreased. The corrosion process of brine-exposed shotcrete includes three stages of brucite, gypsum and ettringite formation, C-S-H decomposition and thaumasite formation, and M-S-H formation. During the three stages, crystal salts accumulated in micropores and microcracks which accelerated the deterioration speed. Finally, as combined action of expansion stress and crystallization pressure which come from thaumasite, brucite, gypsum, ettringite and crystallized salt, web cracks are formed in shotcrete and surface, which caused damage evolution quickly of shotcrete lining.
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2019, Vol. 33 
