Influence of Replacement Level of Coal-series Kaolin on Hydration of Ordinary Portland Cement by X-ray Diffraction/Rietveld Method
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第3期
论文作者：刘园圆 雷绍民 LI Yang XIE Feixiang LI Bo
文章页码：614 - 621
摘 要：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 str?tlingite 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.
刘园圆1,2，雷绍民2，LI Yang2，XIE Feixiang2，LI Bo3
1. School of Civil and Architectural Engineering,Yangtze Normal University2. School of Resource and Environment Engineering,Wuhan University of Technology3. Yichang Huilong Science and Technology Co.,Ltd.
摘 要：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 str?tlingite 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.
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