It is of great significance for the optimization and performance improvement of aggregates to investigate the influence of aggregate chemical properties on the nucleation and growth of calcium silicate hydrate (C-S-H)and its mechanism. In this work, limestone, quartz and magnesite were used as aggregates. The interactions between different aggregates and ions in a simulated solution were determined via zeta potential measurement. Also, the nucleation and growth of C-S-H on the surface of these aggregates were analyzed by scanning electron microscopy. The hydration heat of cement pastes with the micro-aggregates was examined to investigate the effect of aggregate chemical properties on the early hydration of cement. The results show that limestone surface has a strong adsorption of Ca2+ (i.e., chemical adsorption), leading to a high density of C-S-H nuclei and directional growth of C-S-H, and thus greatly promoting the hydration of cement. The adsorption of Ca2+ on quartz surface is due to electrostatic force, which is weaker than that due to the chemical adsorption. The density of C-S-H nuclei on quartz surface is thus much lower than that on limestone surface. In the case of magnesite, its surface has a high affinity for SO42- rather than Ca2+, reducing the nucleation density of C-S-H on the surface of magnesite, and thus slowing down the early hydration of cement.
|Translated title of the contribution||Effect of Aggregate Chemical Properties on Nucleation and Growth of Calciun Silicate Hydrate|
|Original language||Chinese (Traditional)|
|Number of pages||8|
|Journal||Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society|
|Publication status||Published - 2021|
- Calcium silicate hydrate
- Zeta potential