Influence of Metakaolin on Properties of Magnesium Potassium Phosphate Cement with High Water-to-Solid Ratio
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 9
Abstract
In this paper, the effect of metakaolin on the performance of magnesium potassium phosphate cement (MKPC) with a high water-to-solid (w/s) ratio of 0.375 was studied. MKPC was prepared by substituting metakaolin for varying amounts of magnesia. The results showed that the increase of metakaolin led to a decrease in the fluidity of the fresh MKPC slurry. Additionally, the presence of metakaolin reduced the maximum temperature of the second peak in the MKPC hydration reaction and delayed its appearance. This is because of the amount of magnesia as an effective alkaline component decreased. Metakaolin improved the compressive strength of MKPC by reducing the porosity and forming new hydration products. Moreover, it was found that the compressive strength of MKPC with 30% metakaolin exhibited the highest at 20.36 MPa at 28 days and showed a downward trend when metakaolin exceeded 30%. Metakaolin owns the pozzolanic effect as well as the filling effect in the MKPC system of a high w/s ratio, which is the reason for the improvement in compressive strength and reduction of chloride diffusion. This work provides some fundamental information for understanding the high w/s ratio MKPC modified by metakaolin, which helps to promote its application in the field of anticorrosion coatings and waste stabilization/solidification binders.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported by The Science and Technology Development Fund, Macau SAR (File No. FDCT-0138/2020/A3); National Natural Science Foundation of China, Excellent Young Scientists Fund (HK&Macau) (File No. 5212290021), and Shenzhen-Hong Kong-Macau science and technology plan (c) (File No. SGDX2020110309360).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Oct 11, 2021
Accepted: Jan 14, 2022
Published online: Jun 28, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 28, 2022
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