Abstract
In order to study the characteristics of high water‐content materials (HWC) undergoing chloride erosion, we analyzed and summarized changes in strength, elastic modulus, and mass of HWC materials during chloride erosion using specific experimental research, and we also described the compression failure morphologies of HWC materials after erosion. The cuboid specimens developed a horizontal crack between the top and bottom, and the cylindrical specimens developed irregular encryption cracks at the top during increasing pressure. The erosion of HWC materials exposed to calcium chloride (CaCl2) solutions was relatively serious, and the erosion of the cuboid specimens was lower than that of the cylindrical specimens. The strength of HWC materials increased during prolonged erosion, and the strength of the cylindrical specimens in water was the highest, followed by the CaCl2 and sodium chloride (NaCl) solutions. However, the strength change of the cuboid specimens after 28 d was contrary to the above order. In late erosion stages, the HWC materials had better compactness and experienced smaller compressive deformation in water than the other two solutions. In the NaCl solution, the high‐water filling material had more pores and a larger deformation than the other solutions.
Highlights
In China, high water-content materials (HWC) materials are mainly used to fill the goafs of coal mines. ey can support the surrounding rock and restrict its deformation during the filling process, which cannot be separated from the excellent performance of HWC materials
Material A was made of bauxite, gypsum, etc., and was composed of composite super retarder and dispersant. e second material was composed of the B and B-B materials. e B material was made by mixing and grinding together gypsum and lime with a small amount of composite retarder. e ratio of the four components of HWC materials (A, A-A, B, and B-B) was 1 : 0.1 :1 : 0.04, according to the proportion of various materials. e water-solid ratio was unchanged at 3 :1. e A, A-A, B, and B-B materials were mixed with water according to the water solid ratio to form a slurry. e hydration hardening reaction occurred, and the final slurry was condensed to form a high water quick-setting material
From the analysis of fracture morphologies, changes in mass, compressive strength, and modulus of elasticity of HWC materials after erosion in chloride salt solutions, the following conclusions can be drawn: (1) From the fracture morphologies, it is clear that there is a significant difference between the fractures developed in the cuboid specimen and the cylindrical specimen. e cuboid specimen produced a horizontal crack between the top and bottom
Summary
In China, HWC materials are mainly used to fill the goafs of coal mines. ey can support the surrounding rock and restrict its deformation during the filling process, which cannot be separated from the excellent performance of HWC materials. Sun et al [1] studied the influence of fly ash content on setting time, suspension, strength, and hydration heat release of HWC materials under different water-solid ratios. Liu et al [3] have studied the law of surface subsidence and deformation after filling the goaf with HWC material. Guangming et al [4] analyzed and studied the hydration mechanism and physical-mechanical properties of the HWC material and their role in water plugging by grouting. Li and Liu [9] studied the mechanical properties and damage constitutive model of HWC materials under different loading rates. Wang et al [10] studied the surface subsidence control during mine filling with ultra-HWC materials in the Handan mining area
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
