Dissolution–precipitation kinetics during C3S hydration: A holographic interferometry study

Ludovico Mascarin (1) , Luca Valentini (1) , Gilberto Artioli (1) , Maria Chiara Dalconi (1) , Jean Colombani (2)

1 Unipd - Università degli Studi di Padova = University of Padua
2 iLM - L&I - iLM - Liquides et interfaces

Tricalcium silicate C 3 S has been widely employed in model systems to interpret the complex mechanisms of cement hydration. The present study aims at providing an accurate description of the dissolution rate of C 3 S by implementing a new approach based on holographic interferometry. We propose a protocol that allows the measurement of the pure dissolution rate constant of the C 3 S phase by experiments performed in supersaturated conditions with respect to C-S-H. In these experiments, a flat polycrystalline surface of C 3 S was monitored in a quiescent solution. The amount of calcium released within the holographic cell was measured and the aqueous solution composition was constrained to the C-S-H stoichiometry at the interface. An equilibrium approach was applied to assess interfacial pH, saturation indexes, and C-S-H precipitation at the experimental conditions. Providing the rate constant allowed tracing the rate law of the pure dissolution of C 3 S from far to close-to-equilibrium conditions.

Mots clés: Cement hydration; Tricalcium silicate; C-S-H; Holographic interferometry; Dissolution rate constant

Domaines: Matériaux

Ludovico Mascarin, Luca Valentini, Gilberto Artioli, Maria Chiara Dalconi, Jean Colombani. Dissolution–precipitation kinetics during C3S hydration: A holographic interferometry study. Cement and Concrete Research, 2023, 173, pp.107252. ⟨10.1016/j.cemconres.2023.107252⟩. ⟨hal-04210396⟩