蔗糖和活性氧化镁对硫氧镁水泥水化进程的影响  

Effect of Sucrose and Active Magnesia on the Hydration Process of Magnesium Oxysulfate Cement

作　　者：许星星 李晶[2] 陈啸洋 余红发[3] 关岩 XU Xingxing;LI Jing;CHEN Xiaoyang;YU Hongfa;GUAN Yan(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;School of Chemical Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Reseach Institution of Keda Fengchi Magnesium Building Materials,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]辽宁科技大学化学工程学院,辽宁鞍山114051 [3]南京航空航天大学土木工程学院,江苏南京210016 [4]辽宁科技大学科大峰驰镁建材研究院,辽宁鞍山114051

出　　处：《建筑材料学报》2023年第2期193-199,共7页Journal of Building Materials

基　　金：国家重点研发计划资助项目(2020YFC1909304);国家自然科学基金资助项目(51778101)。

摘　　要：为了缩短硫氧镁水泥(MOSC)的凝结时间,提高其早期力学性能,以蔗糖为分散剂,用不同水化活性的氧化镁(MgO)粉制备了MOSC,分析了蔗糖对MOSC凝结时间、水化性能、抗压强度、物相组成、微观形貌和孔结构的影响.结果表明:活性为75.0%的MgO粉较活性为65.5%的MgO粉制备的MOSC凝结时间更短,早期抗压强度更高;蔗糖作为分散剂更适用于活性为75.0%的MgO粉制备的MOSC体系,通过其空间位阻效应的发挥,改善新拌浆体的流动度,延长新拌浆体的初凝时间和终凝时间,还能抑制Mg(OH)_(2)的生长,降低硬化浆体的孔隙率,提高其28 d的抗压强度;蔗糖可促进MOSC吸收大气中的CO_(2)形成MgCO_(3)晶体.To shorten the setting time and improve the early mechanical property of magnesium oxysulfate cement(MOSC),MOSC was prepared using magnesia(MgO) powder with different activities,and sucrose was used as a dispersing agent.The effect of sucrose on the setting time,hydration performance,compressive strength,phase composition,microstructure and pore structure of MOSC was investigated.The results show that,compared with samples prepared using MgO powder with 65.5% hydration activity,the setting time of MOSC prepared using MgO powder with 75.0% hydration activity is shorter and its early compressive strength is higher.Sucrose is preferable to MOSC prepared using MgO powder with 75.0% hydration activity.The sterically hindered effect of sucrose improves the fluidity of fresh MOSC paste,prolongs the initial and final setting time,inhibits the formation of Mg(OH)_(2),reduces the total porosity and enhances the 28 d compressive strength of hardened MOSC paste.The addition of sucrose is beneficial for MOSC to absorb CO_(2)in the atmosphere to form MgCO_(3).

关 键 词：硫氧镁水泥 活性氧化镁粉 蔗糖 水化进程 抗压强度 水化产物 孔结构 

分 类 号：TQ172.1[化学工程—水泥工业]