缓凝剂对氯氧镁水泥水化历程的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (4): 1222-1228.

缓凝剂对氯氧镁水泥水化历程的影响

陈迎雪, 廖宜顺, 万方琪, 陈明洋, 余竞硕

武汉科技大学城市建设学院,武汉 430065

收稿日期:2021-11-25 修回日期:2021-12-30 出版日期:2022-04-15 发布日期:2022-04-27
通讯作者: 廖宜顺,博士,副教授。E-mail:liaoyishun@wust.edu.cn
作者简介:陈迎雪(1997—),女,硕士研究生。主要从事新型水泥基材料的研究。E-mail:2488406510@qq.com
基金资助:
长江科学院开放研究基金(CKWV2019756/KY);国家自然科学基金(51608402);湖北省大学生创新创业训练计划项目(S202010488070)

Effect of Retarder on Hydration Process of Magnesium Oxychloride Cement

CHEN Yingxue, LIAO Yishun, WAN Fangqi, CHEN Mingyang, YU Jingshuo

School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China

Received:2021-11-25 Revised:2021-12-30 Online:2022-04-15 Published:2022-04-27

摘要/Abstract

摘要： 为了拓展氯氧镁水泥(MOC)的使用范围,研究了缓凝剂(柠檬酸、硼酸、葡萄糖酸钠)对氯氧镁水泥凝结时间、抗压强度、电阻率、水化热和耐水性的影响,同时采用X射线衍射仪分析了氯氧镁水泥改性后的水化产物。结果表明,掺入缓凝剂会延长氯氧镁水泥的凝结时间,当缓凝剂掺量达到0.75%(质量分数,下同)时,各组试样的28 d抗压强度较空白组分别下降了19.3%、16.7%和20.2%。缓凝剂的掺入降低了水泥浆体电阻率速率曲线和内部温度曲线的峰值,推迟了水化放热速率曲线第二峰值出现时间,即降低了氯氧镁水泥的水化速率,改善了氯氧镁水泥放热集中的现象。缓凝剂能提高氯氧镁水泥的耐水性,当硼酸掺量为0.75%时,软化系数可达到0.79。

关键词: 氯氧镁水泥, 柠檬酸, 硼酸, 葡萄糖酸钠, 电阻率, 耐水性

Abstract: In order to broaden the application range of magnesium oxychloride cement (MOC), the effects of three retarders including citric acid, boric acid and sodium gluconate on the setting time, compressive strength, electrical resistivity, heat of hydration and water resistance of magnesium oxychloride cement were investigated. Meanwhile, X-ray diffractometer was used to analyze the hydration products of modified MOC. The results show that retarders prolong the setting time. When the content of retarders is 0.75% (mass fraction, the same below), the 28 d compressive strength of samples compared with the control group decreases by 19.3%, 16.7% and 20.2%, respectively. The addition of retarders reduces the peak value of electrical resistivity rate curves and internal temperature curves, delays the second peak of hydration heat rate curves, that is, retarders reduce the hydration rate of magnesium oxychloride cement so that the heat is liberated slowly. Retarders can improve the water resistance of magnesium oxychloride cement. When the content of boric acid is 0.75%, the softening coefficient reaches 0.79.

Key words: magnesium oxychloride cement, citric acid, boric acid, sodium gluconate, electrical resistivity, water resistance

中图分类号:

TQ172

陈迎雪, 廖宜顺, 万方琪, 陈明洋, 余竞硕. 缓凝剂对氯氧镁水泥水化历程的影响[J]. 硅酸盐通报, 2022, 41(4): 1222-1228.

CHEN Yingxue, LIAO Yishun, WAN Fangqi, CHEN Mingyang, YU Jingshuo. Effect of Retarder on Hydration Process of Magnesium Oxychloride Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(4): 1222-1228.

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