柠檬酸对氯氧镁水泥水化过程及性能的影响  

Effect of citric acid on hydration process and performance of magnesium oxychloride cement

作　　者：喻俊 廖国胜[1,2,3] 陈迎雪 刘艳玲 董兴智 程利力 廖宜顺 YU Jun;LIAO Guosheng;CHEN Yingxue;LIU Yanling;DONG Xingzhi;CHENG Lili;LIAO Yishun(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Hubei Provincial Engineering Research Center of Urban Regeneration,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065 [2]城市更新湖北省工程研究中心,湖北武汉430065 [3]武汉科技大学高性能工程结构研究院,湖北武汉430065

出　　处：《混凝土与水泥制品》2024年第3期93-98,共6页China Concrete and Cement Products

基　　金：国家级大学生创新创业训练计划项目(201810488024);国家自然科学基金项目(51608402)。

摘　　要：研究了不同掺量(0、0.2%、0.4%、0.6%、0.8%)的柠檬酸对氯氧镁水泥(MOC)凝结时间、抗压强度、电阻率、体积稳定性和耐水性的影响,并通过XRD和SEM分析了其作用机理。结果表明:掺入柠檬酸会延长MOC的凝结时间和水化诱导期,延缓水化进程,降低抗压强度,但能有效改善MOC的体积稳定性和耐水性;掺入柠檬酸会使MOC水化产物5Mg(OH)2·MgCl2·8H2O(相5)的含量增加,晶体形态改变;空白组浸水28 d后,其内部生成了大量片状Mg(OH)2;掺柠檬酸的试件浸水28 d后,其内部疏松多孔的Mg(OH)2较少,大量絮状相5相互搭接,使MOC的内部结构更加致密,耐水性得到提升。The effects of different contents of citric acid(0,0.2%,0.4%,0.6%,0.8%)on the setting time,compressive strength,electrical resistivity,volume stability,and water resistance of magnesium oxychloride cement(MOC)were studied,and the mechanisms were analyzed by XRD and SEM.The results show that adding citric acid can prolong the setting time and hydration induction period of MOC,delay the hydration process,reduce compressive strength,but effectively improve volume stability and water resistance.The addition of citric acid increases the content of MOC hydration product 5Mg(OH)2·MgCl2·8H2O(phase 5)and changes its crystal morphology.After being immersed in water for 28 d,a large amount of flaky Mg(OH)2 is generated inside the blank group.After being immersed in water for 28 d,the specimens mixed with citric acid show less loose and porous Mg(OH)2 inside,and a large amount of flocculent phase 5 overlaps with each other,making the internal structure of MOC more dense and improving its water resistance.

关 键 词：氯氧镁水泥 柠檬酸 水泥水化 体积稳定性 耐水性 

分 类 号：TU528.0[建筑科学—建筑技术科学]