粉煤灰复合胶凝材料充填体强度与水化机理研究  

Experiment study of compressive strength and mechanical property of filling body for fly ash composite cementitious materials

作　　者：李茂辉[1,2] 杨志强[2,3] 王有团[1,2] 高谦[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学金属矿山高败开采与安全教育部重点实验室,北京100083 [3]金川集团股份有限公司,甘肃金昌737100

出　　处：《中国矿业大学学报》2015年第4期650-655,695,共7页Journal of China University of Mining & Technology

基　　金：国家高技术研究发展计划(863)项目(SS2012AA062405)

摘　　要：为了提高粉煤灰资源利用率和充填采矿效益,以金川镍矿为工程背景,采用X射线衍射(XRD)和扫描电镜(SEM)分析并结合胶结充填体强度试验,开展了粉煤灰替代水泥和矿渣微粉的复合胶凝材料的水化机理研究与充填体强度试验.结果显示:掺入粉煤灰的复合胶凝材料的水化产物主要是斜方钙沸石晶体、钙矾石晶体和C-S-H凝胶.当粉煤灰替代20%的水泥掺量时,3,7和28d充填体强度分别降低26.9%,29.9%和20.3%;当粉煤灰替代15%的矿渣微粉,3,7d强度分别降低23.5%和20.1%,但28d强度却提高7.6%.在满足金川矿山下向分层充填法采矿条件下,粉煤灰替代水泥掺量、矿渣微粉掺量分别可达到20%和15%.与矿用水泥充填材料相比,复合充填胶凝材料成本降低约49.8%.In order to improve the resource utilization of fly ash and increase the efficiency of the filling mining,the compressive strength and mechanical property of fly ash filling body,a substitute for cement and slag powder,was studied under the engineering background of Jinchuan nickel mine.The hydration products and microstructure of filling body using the X ray diffraction（XRD）and scanning electron microscope（SEM）wer analyzed.The results show that the gimondine crystal,ettringite crystal and C-S-H gel are the main hydration products of fly ash composite cementitious materials.When 20% of cement is replaced by fly ash,the compressive strength of filling body is respectively decreased by 26.9%,29.9%and 20.3% on the3 rd day,7th day and 28 th day.When 15% of slag powder is replaced by fly ash,the compressive strength of filling body are respectively reduced by 23.5% and 20.1% on the 3rd day and7 th day,but it is increased by 7.6% on the 28 th day.The replace content of fly ash can reach to 20% and 15%for cement and slag powder respectively.The composite cementitious materials cost decreases by 49.8% comparing with the cost of cement materials.

关 键 词：粉煤灰 复合充填材料 水泥 抗压强度 水化机理 

分 类 号：TD98[矿业工程—选矿]