羟丙基甲基纤维素改善铁尾矿砂砂浆的性能  

Improving Effect of HPMC on Properties of Cement-Tailings Sand Mortar

作　　者：贺艳军 张金山 石占山 陈凯 He Yanjun;Zhang Jinshan;Shi Zhanshan;Chen Kai(Mining Research Institute,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia 014010;Lijiatun Coal Mine,Shenhua Baotou Energy Co.,Ltd.,Ordos,Inner Mongolia 017000;School of Mines,Liaoning Technical University,Fuxin,Liaoning 123000)

机构地区：[1]内蒙古科技大学矿业研究院,内蒙古包头014010 [2]神华包头能源有限责任公司李家壕煤矿,内蒙古鄂尔多斯017000 [3]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《非金属矿》2020年第6期30-32,共3页Non-Metallic Mines

基　　金：国家自然科学基金(52064043,51764044);内蒙古自治区自然科学基金(2020MS05010)。

摘　　要：以铁尾矿砂、硅酸盐水泥为原料,羟丙基甲基纤维素(HPMC)为黏度改性剂制备水泥砂浆,优化大掺量铁尾矿砂对新拌砂浆黏聚性的不良影响,进一步研究HPMC对硬化砂浆性能的影响。结果表明,HPMC会降低铁尾矿砂砂浆的流动性,HPMC与减水剂复合使用可改善新拌砂浆在相近流动度下的泌水率;适宜掺量的HPMC会延缓水泥的水化进程,但可以改善硬化砂浆的匀质性,使抗压强度略微增高;HPMC可以改善硬化砂浆的孔隙结构,降低孔隙率,降低砂浆干燥收缩,对长期耐久性有利。In this paper,cement mortar was prepared with iron tailings sand and Portland cement,hydroxypropyl methyl cellulose(HPMC)was selected as the viscosity modifier to eliminate the negative effect of high-volume tailings sand on the consistency and anti-bleeding property of fresh mortar.The effects of HPMC on properties of hardened mortar were further explored.The results indicate that:HPMC reduces the fluidity of fresh mortar and improves the anti-bleeding property with the combined use of superplasticizer;Appropriate content of HPMC retards the cement hydration,however,improves the homogeneity of hardened mortar,thereby increase the compressive strength;HPMC refines the pore structure and reduces the porosity,thus reduce the drying shrinkage and exerting positive effects on long-term durability.

关 键 词：羟丙基甲基纤维素 尾矿砂 水泥砂浆 力学性能 孔隙率 

分 类 号：TU578.13[建筑科学—建筑技术科学] X757[环境科学与工程—环境工程]