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MANGAT, Pritpal and OJEDOKUN, Olalekan (2024). Alkalinity and Cl-/Oh- affecting reinforcement corrosion in alkali activated concrete. In: CLAISSE, Peter, GANJIAN, Esmaiel and NAIK, Tarun, (eds.) Sixth International Conference on Sustainable Construction Materials and Technologies (SCMT6). Coventry, Coventry University.
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Abstract
The paper reports the effect of hydroxyl ion (OH) and chloride (Cl) concentrations of pore fluid on reinforcement corrosion in AAC under long term chloride exposure. The OH and Cl are influenced by the activator molarity. AAC has much higher OH than the control Portland cement (PC) concrete at early ages of chloride exposure and the corresponding Cl/OH ratios are lower for AAC. However, under long term chloride exposure, the Cl/OH ratios of AAC start exceeding the PC concrete due to the superior chloride binding capacity of Portland cement. The critical threshold Cl/OH ratio for corrosion initiation in AAC is between 2 and 3.28, whereas it is < 1 for PC concrete. The steel reinforcement in AAC remains free from chloride induced corrosion for a longer period and up to higher Cl-/OH- ratios than PC concrete due to the presence of elemental Sulphur (sulfides) on the steel surface in AAC.
| Item Type: | Book Section |
|---|---|
| Additional Information: | Sixth International Conference on Sustainable Construction Materials and Technologies (SCMT6), University of Lyon (ENTPE), Lyon, France, 9-14 June 2024. Series ISSN: 2515-3056 |
| SWORD Depositor: | Symplectic Elements |
| Depositing User: | Symplectic Elements |
| Date Deposited: | 19 Mar 2024 10:05 |
| Last Modified: | 20 Jun 2024 08:30 |
| URI: | https://shura.shu.ac.uk/id/eprint/33440 |
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