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Effect of particle size of two types of silica nanoparticles (SNPs) on hydration kinetics of tricalcium silicate (C 3 S) and Portland cement was investigated. Two different types of SNPs were used in the present study, first one is the synthesized by sol-gel method (SNPs-sg) having particle size 30–70 nm, while the second one is the synthesized by Flame Spray Pyrolysis method (SNPs-fsp) having particle size &lt;10 nm. The dosages of SNPs used in this study varied from 1–10% and water/binder ratio used for the hydration was 0.4. Rietveld analysis of XRD results show that at 4 h of hydration, the unhydrated content in control samples at 4 h hydration was ∼88% and in presence 1% SNPs-sg, it was ∼75%, however, in presence of SNPs-fsp, the content of unhydrated C 3 S was ∼60%. Further, FTIR results reveal that in case of control samples at 1 h of hydration, the characteristic peaks of C 3 S at 850 cm −1  and 940 cm −1  are present, while, with 1% SNPs-sg addition, reduction in the intensity C 3 S peaks were observed showing acceleration in dissolution rate and a broader peak is observed at ∼1110 cm −1  with 1% SNPs-fsp samples indicating the starting of polymerization in silicate chain of C-S-H gel.

Granulometric effect of silica nanoparticles on hydration kinetics and microstructure of cement based materials