水灰比对薄喷衬层材料抗拉性能影响的宏微观试验研究

doi:10.11896/cldb.22090309

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Abstract Thin spray-on liner material TSL865, as a new type of polymer spray support material, can quickly and effectively control the deformation and damage of underground engineering surrounding rock. Tensile performance is the advantageous feature of TSL865 material, but its law and mechanism of action influenced by water-cement ratio is still unclear. To this end, this study carried out two areas of work: (1) the influence law of water-cement ratio on mechanical properties such as tensile stress-strain curve characteristics, tensile strength and tensile toughness of TSL865 specimens was analyzed by conducting macro tensile tests; (2)the influence law of water-cement ratio on the geometric properties such as microscopic aperture distribution and specific surface area of TSL865 specimens was analyzed by conducting microscopic pore structure tests; the fractal dimension of aperture of TSL865 specimens with different water-cement ratios were calculated to decipher the influence mechanism of water-cement ratio on the tensile properties of TSL865 specimens from the perspective of microscopic aperture structure distribution characteristics of specimens and their optimal water-cement ratios were obtained. The results show that the tensile stress-strain curve of TSL865 specimen can be divided into four stages: elastic-plastic-delayed-brittle, and the flexibility characteristics are significant. The reason for the better tensile properties of TSL865 specimens is the larger proportion of harmless pores of 2—10 nm. The water-cement ratio is negatively correlated with the tensile strength and fractal dimension of the aperture of the specimen, and the water-cement ratio changes the microscopic pore structure of the TSL specimen, thus affecting its tensile properties, the optimal water to ash ratio is 1∶2. This work contributes to a comprehensive knowledge of the tensile properties and macroscopic breakage mechanism of TSL865 material.

Key words： thin spray-on liner TSL water-cement ratio tensile property pore structure underground engineering

Published: 25 April 2024 Online: 2024-04-28

CLC number:

TU52

Fund:National Natural Science Foundation of China (51964003), Interdisciplinary Research Project of Guangxi University (2022JCB012).

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	CHEN Qingfa
	YANG Wenxiong
	WU Jiayou
	NIU Wenjing

Cite this article:

CHEN Qingfa,YANG Wenxiong,WU Jiayou, et al. Macro and Micro Experimental Study of the Effect of Water-Cement Ratio on the Tensile Properties of Thin Spray Lining Materials[J]. Materials Reports, 2024, 38(8): 22090309-7.

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https://www.mater-rep.com/EN/10.11896/cldb.22090309 OR https://www.mater-rep.com/EN/Y2024/V38/I8/22090309

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