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首页> 外文期刊>Materials and structures >Pre-reaction temperature effect on C-S-H colloidal properties and xonotlite formation via steam assisted crystallization
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Pre-reaction temperature effect on C-S-H colloidal properties and xonotlite formation via steam assisted crystallization

机译：反应前温度对水蒸气辅助结晶对C-S-H胶体性质和硬硅钙石形成的影响

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摘要

The pre-reaction temperature effects on the crystallization and micro-structure of xonotlite for C-S-H gels with Ca/Si ratio = 1 using a steam assisted crystallization process was investigated. The pre-reaction temperature affected the crystallinity, pore structure and silicate chain structure of C-S-H gels, thereby influencing the xonotlite micro-structure and formation kinetics. A higher Q (2)/Q (1) Si peak intensity ratio were observed in C-S-H gels pre-reacted at 80 A degrees C, indicating that a higher pre-reaction temperature can promote condensation reactions between the Si-OH units, and hence transforming of silicate chain structure from a single chain structure to a double chain structure. The XRD background intensities around 2I similar to = 20A degrees-35A degrees resulting from the occurrence of amorphous C-S-H phase decreased as the pre-reaction temperature increased, suggesting that the pre-reaction temperature can increase the degree of structural order and crystallinity. More xonotlite were formed for C-S-H gels pre-reacted at 40 A degrees C and 60 A degrees C after reacting at 180 A degrees C for 32 h and 190 A degrees C for 16 h compared to the sample pre-reacted at 80 A degrees C, due to the decrease of the solubility resulting from the increase of the average silicate chain length and the decrease of Ca/Si ratio after pre-reaction at 80 A degrees C.
机译：研究了水蒸气辅助结晶法对Ca / Si比= 1的C-S-H凝胶的预反应温度对硬硅钙石结晶和微观结构的影响。预反应温度影响C-S-H凝胶的结晶度，孔结构和硅酸盐链结构，从而影响硬硅钙石的微观结构和形成动力学。在80 A摄氏度下预反应的CSH凝胶中观察到更高的Q（2）/ Q（1）Si峰强度比，表明更高的预反应温度可以促进Si-OH单元之间的缩合反应，因此硅酸盐链结构从单链结构转变为双链结构。随着预反应温度的升高，由非晶C-S-H相的出现而导致的2I附近的XRD背景强度类似于= 20A度至35A度，这表明预反应温度可以提高结构有序度和结晶度。与在80 A摄氏度下预先反应的样品相比，在40 A摄氏度和60 A摄氏度下预先反应的CSH凝胶在180 A摄氏度下反应32 h和190 A摄氏度下反应16 h后形成了更多的硬硅钙石，是由于在80 A的温度下进行预反应后，平均硅酸盐链长的增加和Ca / Si比的降低导致的溶解度降低。

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  • 来源
    《Materials and structures》 |2016年第3期|905-915|共11页
  • 作者

    Hsiang Hsing-I; Chen Wei-Sheng; Huang Wei-Chao;

  • 作者单位

    Natl Cheng Kung Univ, Dept Resources Engn, Particulate Mat Res Ctr, Tainan 70101, Taiwan|Natl Cheng Kung Univ, Sustainable Environm Res Lab, Tainan 70101, Taiwan;

    Natl Cheng Kung Univ, Sustainable Environm Res Lab, Tainan 70101, Taiwan;

    Natl Cheng Kung Univ, Dept Resources Engn, Particulate Mat Res Ctr, Tainan 70101, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Xonotlite; C-S-H gel; Steam assisted crystallization; Autoclaving;

    机译：硬硅钙石;C-S-H凝胶;蒸汽辅助结晶;高压灭菌;

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