石膏掺量对碱激发矿渣水泥砂浆性能的影响  

Effect of gypsum content on properties of alkali-activated slag cement mortar

作　　者：张兰芳 宋松松 梁秋爽 ZHANG Lan-fang;SONG Song-song;LIANG Qiu-shuang(Engineering Research Center of Bridge Structure and Material in the Mountainous Area of Ministry of Education,School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Telecommunication Polytechnic College,Chongqing 402247,China)

机构地区：[1]山区桥梁结构与材料教育部工程研究中心重庆交通大学材料科学与工程学院,重庆400074 [2]重庆电讯职业学院,重庆402247

出　　处：《应用化工》2020年第9期2168-2172,2177,共6页Applied Chemical Industry

基　　金：国家自然科学基金青年基金项目(51502029);材料工程重庆市研究生联合培养基地基金(201905);山区桥梁结构与材料教育部工程研究中心开放基金项目(QLGCZX-JJ2017-1);重庆市教育委员会科技技术研究项目(KJQN201805502);广西道路结构与材料重点实验室开放课题(2018gxjgc1kf005)。

摘　　要：研究了石膏掺量对碱矿渣水泥砂浆流动性、力学性能、干缩及水化性能的影响。结果表明,掺入1%~5%的石膏,碱激发矿渣水泥砂浆的流动度下降;石膏掺量在2%以内时,可提高砂浆的强度,但当掺量超过2%后,强度开始下降;石膏掺量在1%~5%范围内递增时,砂浆的干缩率随之降低。交流阻抗谱分析表明,在碱矿渣砂浆中掺入1%~5%的石膏时,Nyquist图形从30 min^1 d的非Randles图形逐渐过渡到3~28 d的准Randles曲线,表明砂浆内部的电化学反应与其水化反应相匹配,交流阻抗参数R1、R2在3 d后随着石膏掺量增大而增大,表明石膏在一定程度上促进了砂浆的水化。The influence of gypsum content on liquidity,mechanical properties,drying shrinkage and hydration properties of alkali-activated slag cement(AAC)mortar is investigated.The results show that the fluidity of AAC mortar was decreased with the increasing of gypsum content within 1%~5%.When gypsum content is less than 2%,the strength of AAC mortar is improved.However,the strength is decreased when gypsum content is more than 2%.When the content of gypsum increases in the range of 1%~5%,the shrinkage of AAC mortar decreases accordingly.The AC impedance spectroscopy analysis indicated that,when 1%~5%gypsum is added into AAC mortar,Nyquist diagrams were transformed from non-Randles model of 30 min^1 d to quasi-Randles model of 3~28 d.This indicates that the electrochemical reaction inside the AAC mortar matches its hydration reaction.The AC impedance parameters R1 and R2 increase with the increase of gypsum content after 3 d.The addition of gypsum would promote the hydration of mortar to some extent.

关 键 词：碱矿渣水泥砂浆 石膏 流动度 力学性能 干缩 交流阻抗谱 

分 类 号：TQ172[化学工程—水泥工业]