Abstract
Phosphate acid-activated geopolymers were synthesized through the reaction of metakaolin (MK) and phosphoric acid solution. The MK was obtained by calcining kaolin at 850°C for various holding times. The research found that the residual water in MK due to the differences in calcining time played a significant role in the development of geopolymerization of phosphate acid-activated metakaolin-based geopolymers (MKPGs). There was a critical value of the amount of the residual water required to induce the geopolymeric reaction. The compressive strength of MKPG specimens increased with the dehydroxylation of kaolin, and reached a maximum of 107.9 MPa as the residual water content decreased to 1.20% in MK. As the residual water was further dehydroxylated, an ordered phase was formed, and the compressive strength of MKPGs gradually decreased with the extension of the holding time. The measured losses of mass in MKPG specimens showed that the decrease of the residual water led to the increased adsorption of water, thus promoting geopolymerization. After the maximum strength was achieved, the amount of adsorbed water in MKPG specimens was not significantly different.
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Wang, Y., Yu, X., Gao, W. et al. Influences of the Residual Water of Kaolin on the Structure and Properties of Phosphate Acid-Activated Metakaolin-Based Geopolymers. JOM 75, 4881–4886 (2023). https://doi.org/10.1007/s11837-023-06097-7
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DOI: https://doi.org/10.1007/s11837-023-06097-7