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Influence of Replacement Level of Coal-series Kaolin on Hydration of Ordinary Portland Cement by X-ray Diffraction/Rietveld Method

  • Yuanyuan Liu (刘园圆)
  • Shaomin Lei (雷绍民)Email author
  • Yang Li
  • Feixiang Xie
  • Bo Li
Cementitious Materials

Abstract

The influence of replacement level of calcined coal-series kaolin (CCK) on hydration of ordinary Portland cement (OPC) was studied by X-ray diffraction(XRD)/Rietveld method. X-ray diffraction/Rietveld method was used to quantify the crystalline phase composition of the hydrated samples. Additionally, the morphology of hydrated samples was observed by scanning electron microscopy (SEM). The results showed that, calcium hydroxide (CH), ettringite (AFt) and amorphous phase content in hydrated samples decreased as the replacement level of CCK increased, while AFm and strätlingite increased, which was caused by the combination of dilute, physical and pozzolanic effects. The hydration of anhydrous cement phases was accelerated by physical effect but hindered by the retardation effect of CCK. The role of each effects was discussed in detail to analyze the mechanism of OPC hydration with CCK addition. The SEM images showed that the shortening of AFt at 1 day and the denser texture at 28 days was observed with CCK addition, which was caused by the physical and pozzolanic effects, respectively.

Key words

calcined coal-series kaolin X-ray diffraction/rietveld method hydration cement paste morphology 

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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  • Yuanyuan Liu (刘园圆)
    • 1
    • 2
  • Shaomin Lei (雷绍民)
    • 2
    Email author
  • Yang Li
    • 2
  • Feixiang Xie
    • 2
  • Bo Li
    • 3
  1. 1.School of Civil and Architectural EngineeringYangtze Normal UniversityChongqingChina
  2. 2.School of Resource and Environment EngineeringWuhan University of TechnologyWuhanChina
  3. 3.Yichang Huilong Science and Technology Co., Ltd.YichangChina

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