硼砂与蔗糖对磷酸钾镁水泥性能的影响及作用机制

摘要/Abstract

摘要： 在保证凝结时间可控前提下,提高磷酸钾镁水泥早期强度是其工程应用的关键。本研究以硼砂、蔗糖为缓凝组分调控磷酸钾镁水泥水化和硬化过程。结果表明,与凝结时间相同的单掺硼砂、单掺蔗糖组相比,二者复掺(硼砂、蔗糖分别占MgO质量的1.5%、6.0%)的磷酸钾镁水泥水化第二放热峰明显延迟,但放热速率、总放热量均增大,水化产物MgKPO₄·6H₂O生成量增多,3 h强度提高104.1%,且后期强度与单掺硼砂组样品相当。

关键词: 磷酸镁水泥, 硼砂, 蔗糖, 缓凝, 复掺, 晶相转化

Abstract: Under the premise of ensuring the controllable setting time, improving the early strength of potassium magnesium phosphate cement is the key to its engineering application. In this study, borax and sucrose were used as retarding components to regulate the hydration and hardening process of potassium magnesium phosphate cement. The results show that compared with the single-doped borax and single-doped sucrose groups with the same setting time, the second exothermic peak of potassium magnesium phosphate cement mixed with the two (borax and sucrose account for 1.5% and 6.0% of the mass of MgO, respectively) is significantly delayed, but the heat release rate and total heat release increase. The amount of hydration product MgKPO₄·6H₂O is more, the 3 h strength increases by 104.1%, and the later strength is equivalent to that of the single-doped borax group.

Key words: magnesium phosphate cement, borax, sucrose, retarded setting, compound mixing, crystal phase transformation

中图分类号:

TU528

肖家发, 赵志远, 陈衡, 侯鹏坤, 盛春亮, 黄广臣. 硼砂与蔗糖对磷酸钾镁水泥性能的影响及作用机制[J]. 硅酸盐通报, 2023, 42(3): 793-801.

XIAO Jiafa, ZHAO Zhiyuan, CHEN Heng, HOU Pengkun, SHENG Chunliang, HUANG Guangchen. Effects of Borax and Sucrose on Properties of Potassium Magnesium Phosphate Cement and Its Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 793-801.

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