摘要
为了制备低成本充填材料,满足山西省推行绿色采矿试点工作中提出的因地制宜推广充填材料、矸石不升井等绿色采煤技术的要求,利用氟石膏、粉煤灰、煤矸石等废弃矿物资源,制备高水粉煤灰复合充填材料,并对其坍落度、泌水率、力学性能进行了研究;通过XRD和SEM手段对复合材料水化矿物组分及微观结构进行了研究;利用分子动力学软件模拟复合材料力学性能。研究结果表明:该复合材料流动性良好,强度增长速率快,28 d抗压强度可达4.96 MPa;显微观察复合材料结构致密,孔隙较少;复合材料成本低至78元/m^3;复合材料分子模型在NVT系综下模拟,水化硅酸钙的弹性模量比钙矾石高,随着水化硅酸钙的增加,复合材料的力学性能更优。
In order to prepare low cost filling materials to meet the requirements of green coal mining technology proposed in the pilot green mining in Shanxi Province,such as popularize filling materials according to local conditions and coal gangue did not rise to the well,composite filling materials of high water fly ash were prepared by using waste mineral resources such as fluorogypsum,fly ash and coal gangue,and the slump,bleeding rate and mechanical properties of the materials were studied;the composition and microstructure of hydrated mineral were studied by means of XRD and SEM;the mechanical properties of composite materials were simulated by molecular dynamics software.The research results show that the material has good fluidity and high strength growth rate,and the compressive strength of 28 d can reach 4.96 MPa;microscopic observation shows that the composite material is dense and has few porosity;the cost of composite materials is as low as 78 yuan/m^3;the composite molecular model is simulated under the NVT ensemble,the elastic modulus of calcium silicate hydrate is higher than ettringite,and with the increase of calcium silicate hydrate,the mechanical properties of composite materials are better.
作者
白龙剑
严国超
杨涛
BAI Longjian;YAN Guochao;YANG Tao(Taiyuan University of Technology,Taiyuan 030024,China;North China Institute of Science and Technology,Langfang 065201,China)
出处
《矿业安全与环保》
北大核心
2020年第6期32-36,共5页
Mining Safety & Environmental Protection
基金
国家自然科学基金面上项目(51974195,51974127)。
关键词
氟石膏
高水材料
充填材料
抗压强度
分子模拟
fluorogypsum
high water material
filling material
compressive strength
molecular simulation
