Macro and Micro Experimental Study of the Effect of Water-Cement Ratio on the Tensile Properties of Thin Spray Lining Materials
CHEN Qingfa1,2,3,*, YANG Wenxiong1,2, WU Jiayou2, NIU Wenjing2
1 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China 2 School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China 3 Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Nanning 530004, China
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.
通讯作者:
*陈庆发,广西大学资源环境与材料学院教授、博士研究生导师。2002年南方冶金学院采矿系采矿工程专业本科毕业,2005年武汉理工大学资源与环境工程学院采矿工程专业硕士毕业后到广西大学工作至今,2009年中南大学安全技术及工程专业博士毕业。目前主要从事土木工程材料等方面的研究工作。发表论文220余篇,包括International Journal of Rock Mechanics and Mining Sciences、Rock Mechanics and Rock Engineering、Computers and Geotechnics等。chenqf@gxu.edu.cn
引用本文:
陈庆发, 杨文雄, 吴家有, 牛文静. 水灰比对薄喷衬层材料抗拉性能影响的宏微观试验研究[J]. 材料导报, 2024, 38(8): 22090309-7.
CHEN Qingfa, YANG Wenxiong, WU Jiayou, NIU Wenjing. Macro and Micro Experimental Study of the Effect of Water-Cement Ratio on the Tensile Properties of Thin Spray Lining Materials. Materials Reports, 2024, 38(8): 22090309-7.
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2024, Vol. 38 
