Vertical Scanning Interferometry: A New Method to Measure the Dissolution Dynamics of Cementitious Minerals
The aqueous dissolution rate is a key indicator of a portland cement's reactivity, and is relevant in predicting the progress of reactions and property development in cementitious materials. Though a valuable material property, the dissolution rates of the individual cement phases and their mixtures have been seldom determined. This work for the very first time applies vertical scanning interferometry (VSI) as a new method, aptly suited to measure dissolution dynamics of cement relevant minerals. Special emphasis is placed on measuring the first dissolution rate (DRF), i.e., when water initially and for a short duration (i.e., on the order of tens of seconds) contacts the mineral surface. DRF, mol·m-2·s-1/sup>) are measured for a variety of fast and slower dissolving minerals including (1a) natural limestone (CaCO3), (1b) reagent-grade gypsum (CaSO4·2H2 O); (2) alite (impure, MIII-Ca3SiO5); and (3) an ASTM C150, Type I/II ordinary portland cement across a range of solution pHs. Detailed aspects of image acquisition, processing and interpretation are presented to emphasize the methodological and statistical treatment of the results. The outcomes develop quantifications of aqueous dissolution rates - inputs valuable in simulating cement hydration, and forward a new means to study correlations between chemical composition, crystallography, and the reactivity of cementitious materials.
A. Kumar et al., "Vertical Scanning Interferometry: A New Method to Measure the Dissolution Dynamics of Cementitious Minerals," Journal of the American Ceramic Society, vol. 96, no. 9, pp. 2766 - 2778, American Ceramic Society, Sep 2013.
The definitive version is available at https://doi.org/10.1111/jace.12482
Materials Science and Engineering
Keywords and Phrases
Aqueous dissolution; Cementitious materials; Chemical compositions; Dissolution dynamics; Ordinary Portland cement; Property development; Statistical treatment; Vertical scanning interferometries, Calcium carbonate; Hydration; Interferometry; Minerals; Portland cement; Profilometry, Dissolution
International Standard Serial Number (ISSN)
Article - Journal
© 2013 American Ceramic Society, All rights reserved.
01 Sep 2013