铜尾矿砂对高强灌浆料性能的影响  

Effects of copper tailings sand on properties of high strength cement grouts

作　　者：朱清利 ZHU Qingli(Chinese Railway Twenty Bureau Group Third Engineering Company Limited,Chongqing 400065,China)

机构地区：[1]中铁二十局集团第三工程有限公司,重庆400065

出　　处：《新型建筑材料》2022年第3期87-90,共4页New Building Materials

基　　金：重庆市科委基础科学与前沿技术研究项目(cstc2017jcyjAX0056)。

摘　　要：研究了铜尾矿砂替代天然河砂对高强灌浆料工作性能、抗压和抗折强度、弹性模量、收缩性能、抗氯离子渗透性能、孔结构和微观形貌的影响。试验结果表明:铜尾矿砂的取代率越高,灌浆料的流动性越低,各龄期的抗压、抗折强度及弹性模量越高。当铜尾矿砂取代率为10%时,其对灌浆料的收缩性能影响较小,当取代率增加至20%以上时,灌浆料的收缩性能得到了明显改善,表现为体积膨胀率显著增加。铜尾矿砂能提高灌浆料基体的密实度,改善界面过渡区的结构,降低孔隙率,细化孔径,减少有害孔和多害孔的比例,提高灌浆料的抗氯离子渗透性能。The effects of copper tailings sand on the workability,compressive and flexural strength,elastic modulus,shrinkage property,chloride penetration resistance,pore structure and micro-structure of high strength cement grouts were studied by replacing nature sand with different amount of copper tailings sand.The obtained results showed that the higher replacement ratio of copper tailings sand in cement grouts,the lower the fluidity,the higher compressive and flexure strength,as well as the higher elastic modulus of cement grouts.When the replacement ratio of copper tailings sand was 10%,it had little effect on the shrinkage performance of the grouts.However,when the replacement ratio of copper tailings sand increased to more than 20%,the shrinkage property of the grouting material had been significantly improved,as shown by a significant increase in the volume expansion rate.Copper tailings sand could improve the structure of interfacial transition zone and the compactness of the matrix of cement grouts,therefore reduce the porosity of grouts and refine its pore size as well.The proportions of detrimental pore and much detrimental pore were reduced and the chloride ion permeability resistance of cement grouts were also improved.

关 键 词：铜尾矿砂 灌浆料 力学性能 收缩性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]