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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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Algaifi, Hassan Amer
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022The effect of nanosilica incorporation on the mechanical properties of concrete exposed to elevated temperature: a review.citations
- 2021Strength and acid resistance of ceramic-based self-compacting alkali-activated concretecitations
- 2021Assessment of acid resistance of natural pozzolan-based alkali-activated concretecitations
- 2021Mechanical properties of coconut shell-based concrete: experimental and optimisation modellingcitations
- 2021CBA Self-compacting Concrete Exposed to Water Curing
- 2021Application of a novel nanocomposites carbon nanotubes functionalized with mesoporous silica-nitrenium ions (CNT-MS-N) in nitrate removal: Optimizations and nonlinear and linear regression analysiscitations
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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>