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<p>C<sub>3</sub>A and C<sub>3</sub>S are the two fastest hydrating minerals in Portland cement, while nano-SiO<sub>2</sub> also promotes the early hydration of Portland cement. Given the complex composition of cement, it is of more practical significance to study the optimization mechanism of nano-SiO<sub>2</sub> in the early hydration stage of pure C<sub>3</sub>S–C<sub>3</sub>A-gypsum system and reveal the synergistic effect between various phases than to study the early induction of cement-based materials by nanomaterials. Therein, this paper carried out the research on the influence mechanism of nano-SiO<sub>2</sub> on the very early hydration property of the C<sub>3</sub>S–C<sub>3</sub>A-gypsum composite system. Some tests have shown that nano-SiO<sub>2</sub> hinders the dissolution of gypsum components and the generation of ettringite in the product. Furthermore, through some experimental tests, it can be found that the material properties are continuously optimized with the increase in the amount of nano-SiO<sub>2</sub>. When the nano-SiO<sub>2</sub> is added to 1.5&#xa0;mass%, the compressive strength, the hydration rate, and the total porosity improve by 12.8&#xa0;MPa, 21.8, and − 8.3%. All results described and discussed in this study will contribute to the application of nano-SiO<sub>2</sub> and the in-depth understanding of the synergistic effect mechanism between silicate monominerals.</p>

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The synergistic mechanism of hydration between nano-SiO2 and early-strength minerals (C3A and C3S) in cement

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Zunchao Ren,
  • Qingsong Zhang,
  • Jinbang Wang

摘要

C3A and C3S are the two fastest hydrating minerals in Portland cement, while nano-SiO2 also promotes the early hydration of Portland cement. Given the complex composition of cement, it is of more practical significance to study the optimization mechanism of nano-SiO2 in the early hydration stage of pure C3S–C3A-gypsum system and reveal the synergistic effect between various phases than to study the early induction of cement-based materials by nanomaterials. Therein, this paper carried out the research on the influence mechanism of nano-SiO2 on the very early hydration property of the C3S–C3A-gypsum composite system. Some tests have shown that nano-SiO2 hinders the dissolution of gypsum components and the generation of ettringite in the product. Furthermore, through some experimental tests, it can be found that the material properties are continuously optimized with the increase in the amount of nano-SiO2. When the nano-SiO2 is added to 1.5 mass%, the compressive strength, the hydration rate, and the total porosity improve by 12.8 MPa, 21.8, and − 8.3%. All results described and discussed in this study will contribute to the application of nano-SiO2 and the in-depth understanding of the synergistic effect mechanism between silicate monominerals.