摘要
为解决路基采空区塌陷治理,以及煤矸石资源化利用的难题,分析了物理活化对煤矸石胶凝活性的作用规律,利用煤矸石协同矿粉制备路基充填材料,并对其流变特性、凝结时间、抗压强度、吸水率等工作性能进行测试。实验结果表明:随煤矸石掺量的增加,浆液流动度增大,凝结时间延长,结石体强度逐渐降低。当煤矸石掺量为30%~40%时,煤矸石-矿粉(CG-BFS)体系性能最好,结石体的28 d强度高于P.O32.5水泥,吸水率小于30%,满足路基充填材料的技术要求。
In order to solve the problems of roadbed subsidence control and the utilization of coal gangue resources,the effect of physical activation on coal gangue cementation activity was analyzed.The coal gangue and mineral powder were used to prepare roadbed filling materials,and their rheological properties,the working performances such as setting time,compressive strength and water absorption were tested.The experimental results show that as the amount of coal gangue increases,the fluidity of the slurry increases,the setting time increases,and the strength of the paste matrix gradually decreases.Combining economic and material properties,when the amount of coal gangue is 30%—40%,the CG-BFS system has the best performance.The 28-day strength of the paste matrix is higher than P.O32.5 cement,and the water absorption rate is less than 30%.The water resistance meets the technical requirements of roadbed filling materials.
作者
王川
刘超
裴文晶
李召峰
WANG Chuan;LIU Chao;PEI Wenjing;LI Zhaofeng(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China;Shandong Hi-speed Group Co.,Ltd.,Jinan 250098,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2022年第1期97-103,共7页
Journal of Materials Science and Engineering
基金
山东省技术创新资助项目(201931901271)
山东省自然科学基金重点资助项目(ZR2020KE006)。
关键词
充填材料
路基
煤矸石
活化
地聚物
Filling material
Subgrade
Coal gangue
Activation
Geopolymer
