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<p>This study investigates the microstructure of magnesium silicate hydrate (M-S-H) pastes prepared with MgO and silica fume from different sources but of comparable properties, with varying sodium carbonate (NC) contents, using two mixing methods: conventional Hobart-style paddle mixing and low-speed ball-mill mixing. The latter method significantly improved silica fume dispersion and particle packing, resulting in a denser microstructure and substantially higher compressive strength compared to conventional mixing. A NC content of 2.5&#xa0;wt.% was identified as optimal for enhancing microstructure and reducing porosity in conventionally mixed samples, while no clear effect of NC content observed in ball-milled ones. Brucite was detected in NC-containing samples by thermogravimetric analysis, but not by X-ray diffraction, indicating its poor crystallinity. Compressive strength increased with M-S-H formation and decreasing brucite content. These findings highlight the importance of optimising particle packing for improving the microstructure and mechanical properties of magnesium silicate binders.</p>

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Microstructure of magnesium silicate hydrate pastes influenced by carbonate and mixing method

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月23日

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  • M. H. N. Yio,
  • E. Bernard,
  • C. Dewitte,
  • H. Chen,
  • T. C. Chan,
  • R. J. Myers

摘要

This study investigates the microstructure of magnesium silicate hydrate (M-S-H) pastes prepared with MgO and silica fume from different sources but of comparable properties, with varying sodium carbonate (NC) contents, using two mixing methods: conventional Hobart-style paddle mixing and low-speed ball-mill mixing. The latter method significantly improved silica fume dispersion and particle packing, resulting in a denser microstructure and substantially higher compressive strength compared to conventional mixing. A NC content of 2.5 wt.% was identified as optimal for enhancing microstructure and reducing porosity in conventionally mixed samples, while no clear effect of NC content observed in ball-milled ones. Brucite was detected in NC-containing samples by thermogravimetric analysis, but not by X-ray diffraction, indicating its poor crystallinity. Compressive strength increased with M-S-H formation and decreasing brucite content. These findings highlight the importance of optimising particle packing for improving the microstructure and mechanical properties of magnesium silicate binders.