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- W3136925412 abstract "A phosphate based geopolymer was studied to understand the formation mechanism of acid activated mineral. The material was prepared by the reaction of aluminum phosphate solution and metakaolin, and magnesia was used as a modifier. The optimal material mix ratio was obtained by an orthogonal experiment, and the compressive strength test and microstructure analysis were carried out on the sample with the optimal mix ratio, then the reaction mechanism of phosphate based geopolymer was analyzed. The results show that when Si and P molar ratio is 1.2, P and Al molar ratio is 3.0, and the magnesia content is 18%, the compressive strength of the phosphate based geopolymer is the highest. The formation mechanism between metakaolin and phosphate solution is divided into three stages, depolymerization, polycondensation and forming gel network. The polymerization occurs mainly in the alumina layer rather than the silicon oxide layer in metakaolin. Magnesia does not participate in the polymerization, but it reacts with phosphate solution to form MgHPO<sub>4</sub>·3H<sub>2</sub>O crystal, which improves the microstructure of phosphate based geopolymer material." @default.
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- W3136925412 date "2020-11-01" @default.
- W3136925412 modified "2023-10-18" @default.
- W3136925412 title "Preparation and mechanism of phosphate based geopolymer" @default.
- W3136925412 doi "https://doi.org/10.3724/sp.j.1249.2020.06597" @default.
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