EVALUATION OF THE SOLID AND BULK DENSITY OF C-S-H WITH DIFFERENT Ca/（Al＋Si）RATIOS

Puntos clave

• The aim is to evaluate how different Ca/(Al + Si) ratios affect the solid and bulk density of C-S-H in cement pastes.
• Created low-heat Portland cement paste with varying amorphous silica substitution rates.
• Assessed water distribution using 1H-NMR relaxation time measurements.
• Evaluated phase composition and Ca/(Al + Si) ratio via powder X-ray diffraction and Rietveld analysis.
• Measured solid and bulk densities of C-S-H from free water distribution and phase composition.
• Demonstrated that lower Ca/(Al + Si) ratios lead to reduced solid and bulk densities.
• Quantitative assessment showed a clear correlation between silica substitution and density changes.

Resumen