Abstract
Based on laboratory experiments, the paper researches the effect of polyvinyl alcohol (PVA) content on the performance of fly ash-based cement grouting materials. The test results show that the addition of PVA has limited effect on the initial and final setting time and brings a certain but minor delay on the appearance of the hydration peak period. It enhances cement hydration during the hydration slow down period. The impermeability of PVA to the grouting material is obviously improved, and it increases with the growing amount of PVA content. PVA improves the flexural strength and compressive strength of the sample block to varying degrees, and the improvement on flexural strength is more obvious than that on the compressive strength. It has a significant effect on the mechanical properties of the grouting material and can effectively improve the rock mass’s hydraulic coupling characteristics. It also has great application value and practical significance for the prevention and control of water hazards in deep coal stopes.
Highlights
Mine water disasters have always been one of the biggest obstacles restricting the safe coal production in our country
Indoor tests were conducted on the hydration process, impermeability, flexural strength, compressive strength, and initial and final setting time of the grouting material added with polyvinyl alcohol (PVA)
The mixing ratio of PVA content was been optimized for a better engineering application in the prevention of water disaster in the deep stope
Summary
Mine water disasters have always been one of the biggest obstacles restricting the safe coal production in our country. The author made PVA solution by heating, mixed with cement and fly ash to make grouting material, and set up different PVA contents to test separately. A slurry with a mass concentration of 65% was conducted in the experiment to study how different PVA content grouting materials affect cement hydration process, impermeability, flexural strength, compressive strength, and initial and final setting time [38–47].
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