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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

钙矾石的结构变异对膨胀水泥膨胀性的影响

杨久俊1,2; 海然1; 吴科如2   

  1. 1. 郑州大学材料工程学院, 郑州 450052; 2. 同济大学混凝土材料国家重点实验室, 上海 200092
  • 收稿日期:2002-03-21 修回日期:2002-04-26 出版日期:2003-01-20 网络出版日期:2003-01-20

Effect of Ettringite Structural Transformation on Expansive Behavior of Expansion Cement

YANG Jiu-Jun1,2; HAI Ran1; WU Ke-Ru2   

  1. 1.School of Material Engineering; Zhengzhou University; Zhengzhou 450052; China; 2.State Key Lab of Concrete Research; Tongji University; Shanghai 200092; China
  • Received:2002-03-21 Revised:2002-04-26 Published:2003-01-20 Online:2003-01-20

PDF (PC)

1251

被引次数

55

摘要： 通过DTA,X射线衍射分析和SEM观察及与膨胀率和强度的对比分析,给出了钙矾石稳定存在和结构变异的温度范围及其对砂浆膨胀和强度的影响.结果表明,(1)在干热条件下钙矾石在87-150℃之间发生快速脱水,结构极度扭曲失去晶体特征,但结构并不崩溃分解,遇水后即可恢复.100℃以下的湿热条件下,钙矾石可生成和稳定存在;(2)尽管100℃以下的干燥条件膨胀水泥混凝土的强度不降低,但膨胀会完全丧失,甚至产生负膨胀.故膨胀水泥和自应力水泥不宜在70℃以上的干燥环境和干-湿交替的环境中使用.

关键词: 钙矾石, 结构稳定性, 膨胀水泥, 膨胀性

Abstract: The temperature range of the stable existing and structural transformation of ettringite were studied
by DTA, XRD and SEM. The effect of ettringite structural transformation on expansive behavior of expansion cement was found. The result indicates:
(1) Under dry condition, the ettringite dehydrates quickly between 87℃ and 150℃, the structure distortion makes it extremely lose the crystal
characteristic, but it does not decompose and it can be recovered in water. The ettringite can be synthesized and stable existing, under hydrothermal
condition below 100℃. (2) under the dry condition below 100℃, the expansion cement concrete strength does not decrease but its expansive behavior can be lost even negative expansion produced,
so expansion cement and self-stress cement are not suitable under the dry condition of over 70℃ or under the dry and wet alternate conditions.

Key words: ettringite, structural stability, expansion cement, expansive behavior

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