激发剂对赤泥地聚物砂浆力学性能的影响  

Effect of chemical activator on mechanical property of red mud geopolymer mortar

作　　者：刘俊霞[1] 杨艳蒙 王帅旗 刘盼 张茂亮 海然[1] Liu Junxia;Yang Yanmeng;Wang Shuaiqi;Liu Pan;Zhang Maoliang;Hai Ran(School of Architectural Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China;Henan Building Materials Research and Design Institute Co.,Ltd.)

机构地区：[1]中原工学院建筑工程学院,河南郑州450007 [2]河南建筑材料研究设计院有限责任公司

出　　处：《无机盐工业》2020年第6期72-75,共4页Inorganic Chemicals Industry

基　　金：河南省教育厅重点科研计划项目(18A5600004,20A560026);河南省科技厅科技发展计划项目(162102210250)。

摘　　要：以热活化氧化铝赤泥为主要原料制备赤泥地聚物砂浆,对比研究了激发剂种类和掺量对赤泥地聚物力学性能的影响及其合成机理。结果表明,水玻璃、石灰-碱(质量比为2∶1)、石膏-碱(质量比为2∶1)均能改善氧化铝赤泥的反应活性,促进赤泥地聚物的合成,其中水玻璃(氧化硅与氧化钠物质的量比为1.5)的改性效果最为显著。水玻璃、石灰-碱、石膏-碱的最佳掺量分别为20%、7%、10%。水玻璃掺量为20%时,赤泥地聚物砂浆28 d抗压强度和28 d抗折强度分别为32.1 MPa和6.0 MPa。改变激发剂的种类和掺量,可以调整赤泥地聚物砂浆体系的碱度,改变铝硅酸结构的解聚和地聚物的缩聚过程,从而影响其力学性能。Red mud geopolymer mortars were prepared with thermally activated alumina red mud as main raw material.The effects of the kinds and dosages of chemical activators on the mechanical properties and red mud geopolymer synthesis mechanism were dis cussed.The results showed that sodium silicate,gypsum-alkali with mass ratio of 2∶1 and lime-alkali with mass ratio of 2 ∶1,can improve the reactivity of alumina red mud and promote the synthesis of red mud geopolymer.Among them,sodium silicate(the amount-of-substance ratio of silicon oxide to sodium oxide is 1.5) had the most remarkable modification effect.The optimum dosage of sodium silicate,gypsum-alkali and lime-alkali was 20%,7% and 10%,respectively.When the dosage of sodium silicate was 20% compressive and flexural strength of red mud geopolymer mortar at 28 d were32.1 MPa and 6.0 MPa,respectively.The kinds and dosages of activator changed the alkalinity of red mud geopolymer mortar system,adjusted the depolymerization of aluminosilicate and the condensation process of geopolymer,and thus,affected its mechanical properties.

关 键 词：氧化铝赤泥 激发剂 地聚物 合成机理 

分 类 号：TQ133.1[化学工程—无机化工] X781[环境科学与工程—环境工程]