Preparation of Aluminum Silicon Composite Microcapsules and Application in Cement-Based Materials

doi:10.16552/j.cnki.issn1001-1625.2024.1561

Abstract

Abstract: In order to realize the slow-controlled release of inorganic salt-accelerating materials in cement-based materials and achieve the effect of time-varying regulation of cement setting and hardening, in this paper, aluminum sulfate (AlS) was used as the core material and tetraethyl orthosilicate (TEOS) was used as the precursor to prepare aluminum silicon composite microcapsules (SiO₂-AlS) with nano-SiO₂ as the shell and AlS as the core. The structure of SiO₂-AlS was characterized by nitrogen adsorption specific surface area method, laser particle size analysis, X-ray diffraction and scanning electron microscopy. The feasibility of the preparation method was verified, and the slow-release effect and application performance of SiO₂-AlS were investigated. The results show that the prepared SiO₂-AlS shows slow-release effect in solution, which can promote the hydration process of cement, shorten the setting time, and improve the early compressive strength of cement-based materials. However, SiO₂-AlS has little effect on the initial fluidity of cement-based materials, which can meet the construction requirements.

Key words: aluminum sulfate, SiO₂, microcapsule, setting time, liquidity, early compressive strength

CLC Number:

TU528

WU Qingyong, ZHAO Shuang, HAN Bin, WANG Wei, QIAO Min, DU Shuang, CHEN Junsong. Preparation of Aluminum Silicon Composite Microcapsules and Application in Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2388-2395.

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