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A Digital Holographic Microscopy Study of Beta-Dicalcium Silicate Dissolution Kinetics in Water

Published

Author(s)

Alexander S. Brand, Justin Gorham, Jeffrey W. Bullard

Abstract

The surface normal dissolution flux of beta dicalcium silicate is quantified using in situ digital holographic microscopy. The dissolution flux in flowing solutions depends on the water activity to an empirically determined power of 1.7. The heterogeneous distribution of reactive surface sites (e.g., crystalline defects) at the surface leads to a distribution of local fluxes. Accounting for the nominally non-reactive and slowly reactive surface sites, the median of the macroscopic dissolution flux distribution is -0.64 μmol m-2 s-1. Ex situ X-ray photoelectron spectroscopy indicates that the calcium-to-silicon ratio reduced by 10 % after dissolution has occurred.
Citation
Cement and Concrete Research
Volume
118

Keywords

kinetics, Ca2SiO4, digital holographic microscopy, dissolution

Citation

Brand, A. , Gorham, J. and Bullard, J. (2019), A Digital Holographic Microscopy Study of Beta-Dicalcium Silicate Dissolution Kinetics in Water, Cement and Concrete Research, [online], https://doi.org/10.1016/j.cemconres.2019.02.014 (Accessed March 3, 2024)
Created March 9, 2019, Updated October 12, 2021