Berger, Felix ; Bogner, Andreas ; Hirsch, Astrid ; Ukrainczyk, Neven ; Dehn, Frank ; Koenders, Eduardus (2022)
Thermodynamic Modeling and Experimental Validation of Acetic Acid Attack on Hardened Cement Paste: Effect of Silica Fume.
In: Materials, 15 (23)
doi: 10.3390/ma15238355
Article, Bibliographie
This is the latest version of this item.
Abstract
Concrete structures are increasingly becoming exposed to organic acid attack conditions, such as those found in agriculture and food-related industries. This paper aims to experimentally verify the thermodynamic modeling of cement pastes under acetic acid attack. For this, a modeling approach implemented in IPHREEQC via Matlab is described, and results are compared with measured pH and compositions of equilibrated solutions (MP-AES) as well as unreacted/precipitated solids (XRF, XRD and STA) for a wide range of acid concentrations. The 11% replacement of cement by silica fume (SF) led to a 60 or 70% reduction (measured or modeled, respectively) of Portlandite content in the hardened cement paste due to the pozzolanic reaction resulting in higher content of CSH phases, which has effects on the progression of dissolution processes and a resulting pH with increased acid concentrations. Considering that no fitting parameter was used, the model predictions showed good agreement with measured values of pH, dissolved ion concentrations and composition of the remaining (degraded) solids overall. The discrepancies here were more pronounced at very high acid concentrations (equilibrium pH < ~4), i.e., after the full dissolution of hydrate phases due to limitations in the model used to describe Al-, Si- and Fe-gel phases and/or identified experimental challenges in precipitation of calcium and aluminum acetate hydrates.
| Item Type: | Article |
|---|---|
| Erschienen: | 2022 |
| Creators: | Berger, Felix ; Bogner, Andreas ; Hirsch, Astrid ; Ukrainczyk, Neven ; Dehn, Frank ; Koenders, Eduardus |
| Type of entry: | Bibliographie |
| Title: | Thermodynamic Modeling and Experimental Validation of Acetic Acid Attack on Hardened Cement Paste: Effect of Silica Fume |
| Language: | English |
| Date: | 2022 |
| Place of Publication: | Darmstadt |
| Publisher: | MDPI |
| Journal or Publication Title: | Materials |
| Volume of the journal: | 15 |
| Issue Number: | 23 |
| Collation: | 22 Seiten |
| DOI: | 10.3390/ma15238355 |
| Corresponding Links: | |
| Abstract: | Concrete structures are increasingly becoming exposed to organic acid attack conditions, such as those found in agriculture and food-related industries. This paper aims to experimentally verify the thermodynamic modeling of cement pastes under acetic acid attack. For this, a modeling approach implemented in IPHREEQC via Matlab is described, and results are compared with measured pH and compositions of equilibrated solutions (MP-AES) as well as unreacted/precipitated solids (XRF, XRD and STA) for a wide range of acid concentrations. The 11% replacement of cement by silica fume (SF) led to a 60 or 70% reduction (measured or modeled, respectively) of Portlandite content in the hardened cement paste due to the pozzolanic reaction resulting in higher content of CSH phases, which has effects on the progression of dissolution processes and a resulting pH with increased acid concentrations. Considering that no fitting parameter was used, the model predictions showed good agreement with measured values of pH, dissolved ion concentrations and composition of the remaining (degraded) solids overall. The discrepancies here were more pronounced at very high acid concentrations (equilibrium pH < ~4), i.e., after the full dissolution of hydrate phases due to limitations in the model used to describe Al-, Si- and Fe-gel phases and/or identified experimental challenges in precipitation of calcium and aluminum acetate hydrates. |
| Uncontrolled Keywords: | cementitious materials, acid attack, silica fume, pozzolanic reaction, thermodynamic modeling, IPHREEQC, solid-liquid phase equilibration experiments |
| Additional Information: | This article belongs to the Special Issue Mathematical Modeling of Building Materials |
| Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering 600 Technology, medicine, applied sciences > 690 Building and construction |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials |
| Date Deposited: | 02 Aug 2024 12:46 |
| Last Modified: | 02 Aug 2024 12:46 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
Available Versions of this Item
-
Thermodynamic Modeling and Experimental Validation of Acetic Acid Attack on Hardened Cement Paste: Effect of Silica Fume. (deposited 19 Dec 2022 12:42)
- Thermodynamic Modeling and Experimental Validation of Acetic Acid Attack on Hardened Cement Paste: Effect of Silica Fume. (deposited 02 Aug 2024 12:46) [Currently Displayed]
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum