摘要
通过亚氯酸钠预处理和在磷钨酸催化下复合酸酸解的方法改性甘蔗渣,制备出改性甘蔗渣缓凝剂(MBR),采用FTIR对其进行结构表征,通过水化热、XRD和SEM分析其对水泥水化的影响。分别在20和50℃下,对比了其与葡萄糖酸钠(SG)的缓凝效果。结果表明,MBR中含有羟基、羧基和磷酸基,与水泥的适应性良好,缓凝性能优于SG且不影响混凝土后期抗压强度,能够延缓诱导期,降低加速期的水化速率。
Modified bagasse retarder(MBR) was prepared by sodium chlorite pretreatment and compound acid hydrolysis of bagasse in the presence of a catalytic amount of phosphotungstic acid. The structure was analyzed by FTIR. The influence of MBR on the cement hydration was analyzed by hydration heat, XRD and SEM. The retarding effects of MBR and sodium gluconate(SG) were compared at 20 and 50 ℃, respectively. The results showed that MBR contained hydroxyl group, carboxyl group and phosphate group, which had good adaptability to cement, exhibited better retarding performance than SG. MBR did not affect the later compressive strength of concrete, which could delay the induction period and reduce the hydration rate in accelerating period.
作者
屈浩杰
钱珊珊
姚燕
王子明
郑春扬
刘晓
QU Haojie;QIAN Shanshan;YAO Yan;WANG Ziming;ZHENG Chunyang;LIU Xiao(Jiangsu ARIT New Materials Co.,Ltd.,Nanjing 211505,Jiangsu,China;Jiangsu Province Engineering Research Center(ARIT)of Concrete Polymer Additives,Nanjing 211505,Jiangsu,China;College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;China Building Materials Academy,Beijing 100024,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第2期426-432,共7页
Fine Chemicals
基金
国家自然科学基金(51578025)。
关键词
水泥
甘蔗渣
酸解
缓凝
建筑用化学品
cement
bagasse
acidolysis
retarding
building chemicals
