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

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Abstract

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 °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 2Θ = 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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Acknowledgments

This work was financially sponsored by the Headquarters of University Advancement at the National Cheng Kung University, which is sponsored by the Ministry of Education, Taiwan, ROC and Jiadah Chemical Co. Ltd.

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Authors and Affiliations

  1. Department of Resources Engineering, Particulate Materials Research Center, National Cheng Kung University, Tainan, 70101, Taiwan, ROC

    Hsing-I Hsiang & Wei-Chao Huang

  2. Sustainable Environment Research Laboratory, National Cheng Kung University, Tainan, 70101, Taiwan, ROC

    Hsing-I Hsiang & Wei-Sheng Chen

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  1. Hsing-I Hsiang
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Correspondence to Hsing-I Hsiang.

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Hsiang, HI., Chen, WS. & Huang, WC. Pre-reaction temperature effect on C–S–H colloidal properties and xonotlite formation via steam assisted crystallization. Mater Struct 49, 905–915 (2016). https://doi.org/10.1617/s11527-015-0547-0

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