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

研究成果: Article同行評審

10 引文 斯高帕斯(Scopus)

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 Q2/Q1 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.

原文English
頁(從 - 到)905-915
頁數11
期刊Materials and Structures/Materiaux et Constructions
49
發行號3
DOIs
出版狀態Published - 2016 三月 1

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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