单层衬砌喷射混凝土层间力学特性与界面抗渗性能研究

doi:10.11896/cldb.22010218

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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.

Key words： single-shell lining steel fiber reinforced shotcrete interfacial bond strength anti-penetrability performance

Published: 10 August 2023 Online: 2023-08-07

CLC number:

TU528.53

Fund:Technology R & D Planning Project Program of China State Railway Group Co.,Ltd(N2020G046,K2020G035),the National Key R & D Program of China (2020YFC1909900,2021YFB2601000),Natural Science Foundation of Jiangsu Province(BK20211030, BK20211031,BK20221199)and the National Natural Science Foundation of China (52178213).

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	Articles by authors
	WANG Wei
	HUO Jianxun
	ZENG Luping
	LIU Wei
	WANG Yujiang

Cite this article:

WANG Wei,HUO Jianxun,ZENG Luping, et al. Interlayer Mechanical Characteristics and Anti-penetrability Performance of Combined Shotcrete in Single-shell Lining[J]. Materials Reports, 2023, 37(15): 22010218-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22010218 OR http://www.mater-rep.com/EN/Y2023/V37/I15/22010218

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