粒径对固废在充填体材料中胶凝性的影响研究  

Study on the effect of particle size on the cementitious properties of solid waste in backfill materials

作　　者：贾理争 吴宝峰 何磊 韩正伟 杨东杰 Jia Lizheng;Wu Baofeng;He Lei;Han Zhengwei;Yang Dongjie(China Huaye Group Company Limited;School of Minerals Processing and Bioengineering,Central South University;School of Safety Science and Engineering,Henan Polytechnic University)

机构地区：[1]中国华冶科工集团有限公司 [2]中南大学资源加工与生物工程学院 [3]河南理工大学安全科学与工程学院

出　　处：《黄金》2024年第12期53-55,共3页Gold

基　　金：河南省科技攻关项目(242102321101)。

摘　　要：利用胶凝固废代替充填体材料中的水泥,不仅可以降低矿山充填成本,也可以减少环境污染。但是固废的胶凝性受诸多因素影响,粒径大小是一个重要因素。本研究开展多区间粒径固废胶凝充填体材料的试验研究,以单轴抗压强度为指标探究其影响规律,并根据微观结构分析其机理。结果发现,随着粒径的减小,不同龄期下充填体单轴抗压强度逐渐增加,固废的胶凝性增强,并且后期充填体单轴抗压强度增加明显。微观结构发现后期产生大量水化产物,并且水化产物与水泥的水化产物类似。研究结果可为矿山低成本高效充填提供理论支撑。Replacing cement in backfill materials with cementitious solid waste can reduce mine backfilling costs and mitigate environmental pollution.However,the cementitious properties of solid waste are influenced by various factors,among which particle size is a crucial one.This study conducted experimental research on backfill materials using solid waste with different particle size ranges,using uniaxial compressive strength as the evaluation index to explore the impact mechanism.Microscopic structure analysis was performed to understand the underlying mechanism.Results show that as particle size decreases,the uniaxial compressive strength of the filling body increases at different curing ages,enhancing the cementitious properties of the solid waste.Notably,the uniaxial compressive strength of filling body increases significantly at later stages.Microscopic analysis reveals the formation of a large number of hydration products in the later stages,which are similar to those of cement hydration products.

关 键 词：粒径 固废 胶凝性 充填材料 宏细观特征 单轴抗压强度 

分 类 号：TD853.34[矿业工程—金属矿开采]