Aboulela, A. orcid.org/0000-0001-5817-1652, Peyre-Lavigne, M., Huet, B. et al. (3 more authors) (2019) Numerical modelling of sulfuric acid attack on OPC and CAC materials. In: 15th International Congress on the Chemistry of Cement. 15th International Congress on the Chemistry of Cement, 16-20 Sep 2019, Prague, Czech Republic. ICCC Permanent Secretariat
Abstract
A reactive transport model was developed using HYTEC to simulate sulfuric acid attack on cementitious materials. The model was tested on ordinary Portland cement (OPC) and calcium aluminate cement (CAC) matrices using two sulfuric acid solutions at pH 3 and 1 for 100 days. The main results were that the cumulative leached Ca2+ per initial total Ca2+ was controlled by diffusion mechanisms as it increases linearly versus the square root of time. CAC exhibited a better performance, compared to OPC, at pH 3 while it suffered more deterioration at pH 1. Ettringite precipitation was observed in the decalcified zone with gypsum formation detected on surface only at pH 1. Moreover, the analyses of the solid phases’ profiles after 100 days revealed that the dissolution of AH3 in CAC material accounted for the severe deterioration of the matrix at pH 1. Moreover, an optimization of the numerical model to represent the associated laboratory test – BAC-test [Peyre-Lavigne et al. 2015, 2016] – using a 1D model was validated. Furthermore, a brief comparison of the results obtained by two different numerical models (Aquasim and HYTEC) was presented to highlight the main differences – such as database, reactions of hydrated phases and the diffusion in the porous medium – between the two approaches.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 ICCC and the Author(s). |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 15 Feb 2022 10:05 |
Last Modified: | 15 Feb 2022 10:05 |
Published Version: | https://www.iccc-online.org/archive/ |
Status: | Published |
Publisher: | ICCC Permanent Secretariat |
Refereed: | Yes |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:183430 |