Synthesis of SiO₂-PCE Core-Shell Nanoparticles and its Modification Effects on Cement Hydration

Abstract:

NanoSiO₂ was widely used to modify the property of cementitious materials, however, for nanoparticles used in cement-based materials, key problem is the effective dispersion. The surface modification technology can be introduced to promote dispersion of nanoparticles in aqueous system, especially in cement pore solution, which possess high concentration of ions. In this study, at first, NanoSiO₂-polycarboxylate superplasticizer (SiO₂-PCE) core-shell nanoparticle was synthesized from silanized polycarboxylate superplasticizer and colloidal nanoSiO₂ by the “grafting to” method, then SiO2-PCE was testified by UV-Vis, FTIR, and TGA. Additionally, stability of SiO₂-PCE and its effect on cement hydration were investigated. Results shows: SiO₂-PCE possess higher stability in saturated calcium hydroxide solution compared to nanoSiO₂, and heat development of cement hydration can be regulated by shell structure of SiO₂-PCE. The research implied a new approach for nanoSiO₂ to optimize cement-based composites.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 249-255
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.249
• Online since: September 2016
• Authors: Yue Gu*, Qian Ping Ran, Xin Shu, Cheng Yu, Hong Lei Chang, Kai Lv
• Keywords: Cement Hydration, Core-Shell Nanoparticles, nanoSiO₂, Stability of Solution, Surface Modification

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