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Article Dans Une Revue Cement and Concrete Research Année : 2022

Evolution of the particle size distribution of tricalcium silicate during hydration by synchrotron X-ray nano-tomography

Résumé

The particle size distribution of tricalcium silicate (C 3 S) is essential for the modelling of early C 3 S hydration kinetics. In this study, this parameter is analysed during the main hydration period until the first 20 h by synchrotron near-field ptychographic (NF-PXCT) and holographic (HXCT) computed nano-tomography. Additionally, X-ray diffraction, 29 Si NMR, thermal analysis, scanning electron microscopy, and inductively coupled plasma-optical emission spectroscopy were used to investigate the system evolution. The time-dependent pore solution composition is also provided to gain further information. HXCT and NF-PXCT show comparable values regarding the evolution of the C 3 S particle size distribution during hydration, indicating that C 3 S particles smaller than 1.3 μm are completely dissolved after 20 h of hydration. The results can be reasonably reproduced by numerical models if for all particle sizes a constant reacted rim thickness for each degree of hydration is assumed. Data on the aqueous phase composition are also provided.
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Dates et versions

hal-03751622 , version 1 (17-08-2022)

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J Neubauer, T Sowoidnich, L Valentini, C Schulbert, C Naber, et al.. Evolution of the particle size distribution of tricalcium silicate during hydration by synchrotron X-ray nano-tomography. Cement and Concrete Research, 2022, 156, pp.106769. ⟨10.1016/j.cemconres.2022.106769⟩. ⟨hal-03751622⟩

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