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煤矿膏体充填材料(CPBM)由煤矸石、粉煤灰、水泥和水为原料混合而成。为了了解各原料的性质,对煤矸石和粉煤灰的矿物组成、化学成分进行了分析,对固定配比CPBM在不同龄期的抗压强度、孔隙率和电阻率性能进行了研究,测定和观测7,14和28 d的矿物成分和微观结构;针对抗压强度、孔隙率、电阻率和水化过程之间存在的相关性进行了深入探讨。结果表明:1)随龄期的增长,CPBM抗压强度增强,毛细孔减少,孔隙率降低,电阻率增长。2)CPBM原料之间进行水化反应和火山灰反应,生成物是氢氧化钙、C-S-H凝胶和钙矾石。氢氧化钙晶体只存在于7 d龄期的CPBM中,14 d和28 d并未发现氢氧化钙晶体,钙矾石在28 d时化学表达式种类和晶体数量较7 d和14 d时明显增多,并且钙矾石晶体结构随龄期增加呈细长状生长。3)水化反应和火山灰反应是CPBM性能随龄期变化的根本原因,并且性能之间存在着相互联系。
Coal slurry paste filling material (CPBM) from coal gangue, fly ash, cement and water as raw materials from the mixture. In order to know the nature of each raw material, the mineral composition and chemical composition of coal gangue and fly ash were analyzed. The compressive strength, porosity and resistivity of CPBM with fixed proportion were studied at different ages. Mineral compositions and microstructures at 7, 14 and 28 days were observed. The correlation between compressive strength, porosity, resistivity and hydration process was also discussed. The results showed that: 1) With the increase of age, the compressive strength of CPBM increased, the pores decreased, the porosity decreased and the resistivity increased. 2) Hydration reaction and volcanic ash reaction between CPBM raw materials, and the products are calcium hydroxide, C-S-H gel and ettringite. Calcium hydroxide crystals existed only in 7-day-old CPBM. Calcium hydroxide crystals were not found on 14 and 28 days. The chemical expression types and crystal number of ettringite were significantly higher than those on 7 and 14 d Increased, and the ettringite crystal structure grew slenderly with age. 3) Hydration reaction and pozzolanic reaction are the fundamental reasons for the change of CPBM properties with age, and there are interrelated properties.