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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ibrahim, Mohammed
in Cooperation with on an Cooperation-Score of 37%
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Publications (7/7 displayed)
- 2024Evaluating long-term durability of nanosilica-enhanced alkali-activated concrete in sulfate environments towards sustainable concrete developmentcitations
- 2023New Hybrid PVC/PVP Polymer Blend Modified with Er2O3 Nanoparticles for Optoelectronic Applicationscitations
- 2023An overview of factors influencing the properties of concrete incorporating construction and demolition wastescitations
- 2023Evaluating mechanical, microstructural and durability performance of seawater sea sand concrete modified with silica fumecitations
- 2022Engineered and green natural pozzolan-nano silica-based alkali-activated concretecitations
- 2021Assessment of acid resistance of natural pozzolan-based alkali-activated concretecitations
- 2019Influence of composition and concentration of alkaline activator on the properties of natural-pozzolan based green concretecitations
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article
Assessment of acid resistance of natural pozzolan-based alkali-activated concrete
Abstract
<p>Although the synthesis and properties of natural pozzolan (NP)-based alkali-activated binder (AAB) have been investigated, to the best of our knowledge, no study has focused on and assessed the performance of such concrete when exposed to acid attack. In addition, there is a lack of information regarding the optimisation of reaction parameters. Therefore, in the present study, NPs blended with nano-silica (nSiO<sub>2</sub>) from 0 to 7.5% were taken into account to develop alkali-activated concrete (ACC), cured at room temperature, and subsequently exposed to 5% sulfuric acid (H<sub>2</sub>SO<sub>4aq</sub>). The performance of the NP/nSiO<sub>2</sub>-based ACC was evaluated by visual examination, microstructure, weight loss, and compressive strength loss up to one year of exposure to an acidic environment. In addition, artificial neural network (ANN) and response surface methodology (RSM) models were developed to predict and optimize nSiO<sub>2</sub> to ascertain the minimum weight and strength loss. Based on both the predicted and actual results, a significant improvement in the microstructure was achieved with an increase in nSiO<sub>2</sub>. The micro-analytical examination revealed the leaching of vital elements from the binder structure, such as Al, Ca, and Na, which enabled the creation of highly expansive substances such as gypsum, which caused cracking and eventually disintegration in the OPC and NP-based AAB incorporating lower quantities of nSiO<sub>2</sub>. Both the loss in weight and strength were in the range of 23%–39% in the 1% to 7.5% nSiO<sub>2</sub> modified AAC. In contrast, in the control AAC and OPC-based concrete, a weight loss of more than 50% was recorded, along with a substantial reduction in strength.</p>