Influence of Particle Internal Pores on Hydration Kinetics and Microstructure Development in Tricalcium Silicate Hydration: Fid-Bau Portal

Influence of Particle Internal Pores on Hydration Kinetics and Microstructure Development in Tricalcium Silicate Hydration

Wang, Xin / Shen, Dejian / Wu, Shengxing

Abstract

The accurate reconstruction of the morphologic organization of reactants would be a crucial aspect in understanding tricalcium silicate ( $C_{3} S$ ) hydration. However, $C_{3} S$ particles are generally regarded as nonporous solids for simplification in most simulation models. This study aimed to analyze the influence of particle internal pores (PIPs) on hydration kinetics and microstructure development in $C_{3} S$ hydration. The CEMHYD3D model was modified to generate the $C_{3} S$ particles with pores, and its algorithm was accordingly updated. The cases of $C_{3} S$ hydration with various internal pore size distributions (IPSDs) and particle porosities (PPs) were simulated using the modified model. The results indicated that (1) the integral absolute errors for the hydration heat obtained from the simulation considering PIPs decreased by 53.3%, compared with that without considering PIPs; (2) the hydration heat difference between the IPSD categories D and E at 50 h was only $0.5 kJ \cdot {kg}^{- 1}$ which accounted for 0.14% of the hydration heat obtained with the IPSD Category E; and (3) for a fixed PP, the dissolution of the $C_{3} S$ particle with more small-sized PIPs would be more isotropic than that with less small-sized PIPs.