Effect of the Ratio of Silica Source on Ultra-Light Calcium Silicate Material &lt;i&gt;In Situ&lt;/i&gt; Strengthened with Xonotlite Whiskers

Liu, Fei; Li, Ting; Wang, Xiao Dan; Cao, Jian Xin

doi:10.4028/www.scientific.net/amr.648.131

Cited by 1 publication

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“…This suggests that the reactive amorphous C-S-H gel will be dissolved first with the help of water and hence developing micropores after the steam assisted crystallization [33]. The fibershaped xonotlite crystallites then occur within the micropores [34] (Fig. 10d and stage II in Fig.…”

Section: Resultsmentioning

confidence: 96%

Pre-reaction temperature effect on C–S–H colloidal properties and xonotlite formation via steam assisted crystallization

Hsiang

Chen

2015

Mater Struct

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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 prereacted at 80°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 2H = 20°-35°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°C and 60°C after reacting at 180°C for 32 h and 190°C for 16 h compared to the sample pre-reacted at 80°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°C.

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Section: Resultsmentioning

confidence: 96%