建筑垃圾制备膏体充填材料骨料级配优化  

Optimization of Aggregate Gradation of Paste Filling Material Prepared byConstruction Waste

作　　者：海龙[1] 徐博 赵鑫[1] HAI Long;XU Bo;ZHAO Xin(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,Liaoning,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《黄金科学技术》2021年第4期573-581,共9页Gold Science and Technology

基　　金：辽宁省教育厅高等学校基本科研项目“排山楼金矿尾矿胶结充填采空区围岩控制研究”(编号:LJ2017FAL017)资助。

摘　　要：建筑垃圾用作井下充填材料,不仅可以消除其大量堆放造成的环境危害,而且可以解决矿山采空区充填材料不足的问题,有效维护采场安全。采用土工试验的方法,测试了建筑垃圾的基本物理性质。针对建筑垃圾一次破碎中间粒径缺失问题,提出了新的破碎工艺,即将一次破碎后粗骨料的1/3二次破碎至15 mm以下后回混,能够得到级配良好的骨料。根据膏体材料强度及流动性能要求,选用建筑垃圾制备骨料,普通水泥作为胶凝材料,粉煤灰作为添加料,制备合格的膏体材料,开展单轴抗压试验和坍落度试验。结果表明:使用建筑垃圾制备骨料时,控制粉煤灰掺量为15%、水泥掺量为10%、含水率在27%~28%之间,膏体材料的坍落度为21.5~24.0 cm,得到的充填体3 d单轴抗压强度为1.23 MPa、28 d单轴抗压强度为3.55 MPa,能够满足膏体材料对强度和流动性能的要求。Paishanlou gold mine uses crushed stone and cement slurry spray cementation filling technology,and the cement consumption accounts for more than 15%.Due to the poor water absorption of the crushed stone,the gaps between the particles are large and interconnected,a considerable part of the cement slurry is lost,which not only causes waste of materials,but also seriously pollutes the underground environment.In order to solve the problem of the lack of filling materials,the Paishanlou gold mine investigated the conditions of the source of aggregates near the gold mine.Then construction waste piled up on the southern edge of Fuxin City was processed and crushed into underground paste filling material aggregates.Portland cement was used as a cementing material,and a scientific and reasonable material ratio was designed to fill the goaf.By using construction waste,while solving the problem of insufficient sources of underground filling materials,it reduces various hazards caused by a large amount of construction waste.Not only can it bring significant economic benefits to the enterprise,but also make full use of bulk solid waste,resulting in huge environmental and social benefits.Using the method of geotechnical test,the universal hardness of the concrete block was measured to be 3.74,which is a medium firm rock,and the difficulty of breaking is moderately small.The universal hardness of the brick is 1.17,which is a relatively soft rock and easy to break.The apparent density of the material is 2.137,which is less than 2.6~2.8 of general rocks.The natural moisture content is 3.56%and it is in a relatively dry state.The water absorption rate is 9.3%.In view of the lack of intermediate particle size of construction waste in primary crushing,a new crushing process was proposed:1/3 of the coarse aggregate after primary crushing is crushed to less than 15 mm and backmixed to obtain a well-graded aggregate.Good gradation is beneficial to the workability,water requirement and fluidity of the slurry.Aiming at the strength and f

关 键 词：级配优化 破碎工艺 建筑垃圾 膏体材料 单轴抗压强度 坍落度 

分 类 号：X705[环境科学与工程—环境工程]