煤矿膏体充填材料性能随龄期变化的试验研究  

Experimental study on the changes of coal paste backfilling material performance during hydration process

作　　者：戚庭野[1] 冯国瑞[1] 郭育霞[1] 张玉江[1] 任昂[1] 康立勋[1] 郭军[1] 

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《采矿与安全工程学报》2015年第1期42-48,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51174142;51422404);国家"十二五"科技支撑计划项目(2009BAB48B02);教育部新世纪优秀人才支持计划项目(NCET-11-1036);霍英东教育基金项目(132023);教育部博士点基金项目(2012402120013);山西省研究生优秀创新项目;山西省科技成果推广项目(2013071050)

摘　　要：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 paste backfilling material（CPBM） is composed of coal gangue, flyash, ordinary portland cement and tap water. In order to identify the properties of each raw material, the mineral composition, chemical composition of coal gangue flyash have been analyzed; the compressive strength, porosity and electrical resistivity have been studied at different curing times. The samples taken from curing time of 7 d, 14 d and 28 d, have been evaluated for their mineral composition and microstructure. The law of CPBM property with increasing curing time has been analyzed, and the correlation among the compressive strength, porosity, resistivity and hydrating process has also been deeply discussed. The results indicate that firstly, with the curing time increasing, compressive strength and electrical resistivity are increasing, while porosity and small pore content are reducing. Secondly, hydrated and pozzolanic reaction occur in the change of CPBM property, with calcium hydroxide, C-S-H gel and ettringite being the reaction products. The calcium hydroxide crystal is only found at the curing time of 7 d, not at 14 d and 28 d, and the types and quantities of ettringite crystal at 28 d are more than at 7 d and 14 d. The crystal structure of 28 d presented more slender with the curing time increasing. Thirdly, the hydrated and pozzolanic reaction are the two primary reasons causing the change of performance of CPBM strength with the change of curing time. Moreover,there is some interrelation between the performances.

关 键 词：膏体充填材料 抗压强度 孔隙率 电阻率 水化反应和火山灰反应 

分 类 号：TD823.7[矿业工程—煤矿开采]