柠檬酸对氯氧镁水泥的改性  

Modification of Magnesium Oxychloride Cement by Citric Acid

作　　者：陈啸洋 毕万利 张婷婷 余红发[3] 关岩 梁媛媛 CHEN Xiaoyang;BI Wanli;ZHANG Tingting;YU Hongfa;GUAN Yan;LIANG Yuanyuan(School of High Temperature Material and Magnesite Resources Engineering,University of Science and Technology Liaoning,Anshan 114000,Liaoning,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]辽宁科技大学高温材料与镁资源工程学院,辽宁鞍山114000 [2]大连理工大学建设工程学部,辽宁大连116024 [3]南京航空航天大学土木工程系,南京210016

出　　处：《硅酸盐学报》2019年第7期884-890,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(51778101)

摘　　要：为了拓宽氯氧镁水泥(MOC)在建筑、道路等行业的应用,向MOC中掺入柠檬酸,分析了柠檬酸对MOC抗压强度、耐硫酸盐侵蚀性、耐水性、相组成、热稳定性、凝结时间和微观形貌的影响。结果表明:MOC中掺入柠檬酸提高了水化产物5相含量和耐水性;降低了MOC的抗压强度、热稳定性及总孔隙率;延长了MOC的凝结时间。此外,掺入柠檬酸的MOC浸泡在硫酸钠溶液28d后提高了MOC的耐水性,MOC强度保留系数达到0.8。Citric acid was added into magnesium oxychloride cement (MOC) to expand the application of MOC in building and road industry. The effect of citric acid on the compressive strength, sulfate corrosion resistance, water resistance, composition, thermal stability, setting time and microstructure of MOC was investigated. The results show that adding citric acid can in crease the content of phase 5Mg(OH)2-MgCl2-8H2O and improve the water resistance of MOC. Adding citric acid leads to a reduction in compressive strength, thermal stability and total porosity, and prolongs the setting time of MOC. In addition, soaking in sulfate solution after 28 d can improve the sulfate corrosion resistance and the compressive strength retention coefficient of MOC with citric acid (i.e., 0.8).

关 键 词：氯氧镁水泥 柠檬酸 水化产物 微观形貌 耐硫酸盐侵蚀性 

分 类 号：TQ172[化学工程—水泥工业]