硅藻土对水泥铜尾矿粉胶凝材料性能的影响  

Effect of Diatomite on Properties of Cement-Copper Tailing Powder Cementitious Materials

作　　者：付翔[1,2] 李香兰[1] 郭慧 彭小英 刘方华[1,2] 冯胜雷 Fu Xiang;Li Xianglan;Guo Hui;Peng Xiaoying;Liu Fanghua;Feng Shenglei(School of Civil Engineering,Jiangxi University of Technology,Nanchang,Jiangxi,China;Institute of Green Architecture,Jiangxi University of Technology,Nanchang,Jiangxi,China;School of Civil Engineering,Hebei University of Engineering,Handan,Hebei,China)

机构地区：[1]江西科技学院土木工程学院,江西南昌330098 [2]江西科技学院绿色建筑研究所,江西南昌330098 [3]河北工程大学土木工程学院,河北邯郸056038

出　　处：《矿产综合利用》2022年第3期27-31,69,共6页Multipurpose Utilization of Mineral Resources

基　　金：江西省教育厅科技项目基金(GJJ180981,GJJ190997,GJJ191002);江西省卫生健康委科技项目(20202019);江西科技学院自然科学项目基金(ZR1812,ZR1915)。

摘　　要：针对铜尾矿粉-硅酸盐水泥力学强度差的问题,本文拟将硅藻土加入到该胶凝体系中,硅藻土以0.5%,1.0%,1.5%和2.0%等质量替代铜尾矿粉-水泥,测试了复合胶凝材料的流动度、凝结时间、吸水率、孔隙率、体积密度、力学性能和微观性能。结果表明,随着硅藻土掺量的增加,净浆的流动度降低,凝结时间缩短,吸水率和孔隙率减小,体积密度增大,砂浆的抗压强度和抗折强度增加。净浆养护28 d后,硅藻土的加入使得净浆中的SiO_(2)和Ca(OH)_(2)晶体含量减少,C-S-H(水化硅酸钙)凝胶增多,整体比较致密。To overcome the poor mechanical strength of copper tailing powders-Portland cement,diatomite was added into this cementitious system.Diatomite replaced the copper tailing powders-Portland cement with 0.5%,1.0%,1.5% and 2.0% in weight.The fluidity,setting time,water absorption,porosity,bulk density,mechanical properties and microscopic properties of the composite cement materials were tested.The results showed that with the increase of the dosage of diatomite,the fluidities of the pastes decrease,the setting time shortens,water absorptions and porosities decrease,bulk densities increase,compressive strength and flexural strength of the mortars increase.After curing for 28 days,the addition of diatomite makes the SiO_(2)and Ca(OH)_(2)content in the hydration products decrease,the C-S-H(Calcium Silicate Hydrate) gels increase,and the whole is denser.

关 键 词：硅藻土 铜尾矿粉 硅酸盐水泥 胶凝材料 力学强度 

分 类 号：TD989[矿业工程—选矿] TU599[建筑科学—建筑技术科学]