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Dissolution kinetics of polycrystalline calcium sulfate-based materials : influence of chemical modification
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Fisher, Robin D., Mbogoro, Michael M., Snowden, Michael E., Joseph, Maxim B., Covington, James A., Unwin, Patrick R. and Walton, Richard I. (2011) Dissolution kinetics of polycrystalline calcium sulfate-based materials : influence of chemical modification. ACS Applied Materials & Interfaces, Vol.3 (No.9). pp. 3528-3537. doi:10.1021/am200754q
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Official URL: http://dx.doi.org/10.1021/am200754q
Abstract
Using a channel flow cell (CFC) system, the dissolution kinetics of polycrystalline gypsum-based materials have been examined with the aim of understanding their interaction with water, a property that limits the applications of the material in many situations. ICP (inductively coupled plasma) analysis of elemental concentrations in solution as a function of time yields surface fluxes by using a finite element modeling approach to simulate the hydrodynamic behavior within the CFC. After correction for surface roughness, a value for the intrinsic dissolution flux into water of pure polycrystalline gypsum, CaSO4.2H2O, of 1.1 (±0.4) × 10–8 mol cm–2 s–1 has been obtained. The addition of known humid creep inhibitors to the gypsum samples, including boric acid, tartaric acid and 3,4,5-trihydroxybenzoic acid (gallic acid), was found to have little measurable effect on the dissolution kinetics of gypsum: all yielded dissolution fluxes of 1.4 (±0.6) × 10–8 mol cm–2 s–1. However, trisodium trimetaphosphate (STMP) was found to have a small detectable inhibitory effect relative to pure gypsum yielding a flux of 7.4 (±2.0) × 10–9 mol cm–2 s–1. The data strongly suggest that models for humid creep inhibition that involve dissolution–crystallization of gypsum crystallites are less likely than those that involve a hindered ingress of water into the gypsum matrix. For comparison, composite materials that comprised of calcium sulfate anhydrite (CaSO4) crystallites bound by a polyphosphate matrix were also studied. For some of these samples, Ca2+ surface fluxes were observed to be 1 order of magnitude lower than values for polycrystalline gypsum control substrates, suggesting a useful way to impart water resistance to gypsum-based materials.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science > Chemistry Faculty of Science > Engineering |
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| Library of Congress Subject Headings (LCSH): | Gypsum, Polycrystals , Dissolution (Chemistry) | ||||
| Journal or Publication Title: | ACS Applied Materials & Interfaces | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 1944-8244 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Vol.3 | ||||
| Number: | No.9 | ||||
| Page Range: | pp. 3528-3537 | ||||
| DOI: | 10.1021/am200754q | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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