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隧道建设(中英文) ›› 2014, Vol. 34 ›› Issue (12): 1131-1136.DOI: 10.3973/j.issn.1672-741X.2014.12.003

• 研究与探索 • 上一篇    下一篇

液体无碱速凝组分的速凝机理探讨

贺雄飞1, 张迅2   

  1. (1. 中铁隧道集团科研所, 河南 洛阳 471009; 2. 中铁隧道集团有限公司, 河南 洛阳 471009)
  • 收稿日期:2014-09-10 修回日期:2014-10-14 出版日期:2014-12-20 发布日期:2014-12-17
  • 作者简介:贺雄飞(1980—),女,湖南攸县人,2007年毕业于厦门大学,无机化学专业,硕士,工程师,从事隧道及地下工程施工科研工作。
  • 基金资助:

    中铁隧道集团有限公司支持项目(隧研合2009-20)

Study on Acceleration Mechanism of Liquid Alkalifree Accelerating Components

HE Xiongfei1, ZHANG Xun2   

  1. (1. Scientific Research Institute of China Railway Tunnel Group Co., Ltd., Luoyang 471009,Henan, China; 2. China Railway Tunnel Group Co., Ltd., Luoyang 471009, Henan, China)
  • Received:2014-09-10 Revised:2014-10-14 Online:2014-12-20 Published:2014-12-17

摘要:

通过测试单独掺入液体无碱速凝组分硫酸铝和氟化铝后水泥浆的凝结时间以及对掺速凝组分后达到终凝、水化1 d及水化7 d 的水泥浆体进行XRD图谱分析,深入探讨液体无碱速凝剂组分硫酸铝和氟化铝对水泥的速凝机理。试验结果表明: 硅酸盐水泥中掺入硫酸铝溶液因生成大量的钙矾石,同时因消耗大量的钙离子及水化热的作用促进C3S的水化作用导致浆体快速凝结;氟化铝溶液主要通过形成C3AH6 而导致水泥浆体速凝,氟化铝溶液中铝离子对水泥水化起速凝作用,而氟离子起缓凝作用。

关键词: 无碱速凝组分, 水泥水化, XRD分析, 速凝机理

Abstract:

The acceleration mechanism of liquid alkalifree accelerating components, including aluminum sulfate and aluminum fluoride, is discussed by testing on the setting time of cement paste mixed with aluminum sulfate and aluminum fluoride respectively, as well as by XRD analysis on the cement paste mixed with accelerating components after final setting, 1day hydration and 7day hydration. The study results show that, due to the large amount of ettringite generated and the C3S hydration caused by calcium ion reduction and hydration heat, the setting of the cement paste is accelerated when aluminum sulfate solution is mixed into the Portland cement; due to the C3AH6 generated, the setting of the cement paste is accelerated by aluminum fluoride solution; the aluminum ion in the aluminum fluoride solution accelerates the hydration of the cement paste; the fluoride ion in the aluminum fluoride solution retards the setting of the cement paste. The paper can provide a theoretical basis for developing and promoting the application of highperformance liquid alkalifree accelerator.

Key words: alkalifree accelerating components, cement hydration, XRD analysis, acceleration mechanism

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