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A kinetic Monte Carlo study of the C3S dissolution mechanism

Understanding the mechanism that controls cement hydration and its stages is a long-standing challenge. Over a decade ago, the mineral dissolution theory was adopted from geochemistry to explain the hydration rate evolution of alite. The theory is not fully accepted by the community and deserves further investigation. In this work, we apply Kinetic Monte Carlo (KMC) simulations with the mineral dissolution theory as a conceptual framework to investigate and discuss alite dissolution. We build a Kossel crystal model system and parameterize the dissolution activation energies and frequencies based on experimental data. The resulting KMC model is capable of reproducing the dissolution rate and activation energies as a function of the dissolution free energy. The simulations indicate that mineral dissolution theory easily explains the induction and acceleration stages due to a continuous increase of the reactive area as the etch pits open. However, the deceleration stage is hardly reconcilable with the mechanism suggested in the literature, i.e. dislocation coalescence. Still, within the mineral dissolution theory umbrella, we propose and discuss an alternative mechanism based on dislocation exhaustion. The authors would like to acknowledge funding from ‘Departamento de Educación, Política Lingüística y Cultura del Gobierno Vasco’ (Grant No. IT1458-22), the Transnational Common Laboratory ‘Aquitaine- Euskadi Network in Green Concrete and Cement-based Materials’ (LTCGreen Concrete) and the technical and human support provided by the Scientific Computing Service of SGIker (UPV/EHU/ERDF, EU). P.M. also acknowledges the postdoctoral fellowship ‘Margaritas Salas scholarship NEXT GENERATION EU.’ from ‘ministerio de universidades de España’. MJAQ acknowledges funding from the United States’ National Science Foundation under awards CMMI-2145537 and CMMI-2103125.
alite, activation energy, dissolution mechanism, dissolution rate, kinetic Monte Carlo, C3S, dislocations
alite, activation energy, dissolution mechanism, dissolution rate, kinetic Monte Carlo, C3S, dislocations
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