Interlayer Mechanical Characteristics and Anti-penetrability Performance of Combined Shotcrete in Single-shell Lining
WANG Wei1, HUO Jianxun2, ZENG Luping3,*, LIU Wei4, WANG Yujiang1
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 2 China Railway Economic and Planning Research Institute, Beijing 100038, China 3 Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China 4 Sichuan-tibet Railway Co., Ltd., Linzhi 860000, Xizang, China
Abstract: By choosing shotcrete with C25 grade and molded concrete with C30 grade as concrete matrix layer, the combined specimens of simulative single-shell lining were prepared and composed of concrete matrix layer and shotcrete layer. Interlayer mechanical characteristics and water permeation behavior of combined shotcrete in single-shell lining were evaluated systematically including compressive strength, pull-cracking strength, water penetration test with constant pressure and interlayer hydration microstructure analysis. The results show that weakened mechanical zones and crack defects among interface bonding area of combined specimens conducted with double wet-mix spraying method are observed, behaving lower mechanical strength integrally compared to that prepared with shotcrete only. Interfacial bond strengths of fiber reinforced combined concrete specimens are higher than that for plain shotcrete, measured with over 1.2 MPa and follow parabolic law with increasing curing age. Flexural toughness and interfacial bonding properties are improved with fiber component introduced because that much more fiber are distri-buted, rearranged and bridged together along vertical direction toward interlayer zones. Massive portlandite phases of C30 molded concrete are observed and promote the initial hydration process of ettringite crystals in shotcrete type, inducing a compact hydration microstructure of interlayer bonding zones.
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2023, Vol. 37 
