| People | Locations | Statistics |
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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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Salami, Babatunde Abiodun
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (25/25 displayed)
- 2024Evaluating long-term durability of nanosilica-enhanced alkali-activated concrete in sulfate environments towards sustainable concrete developmentcitations
- 2023Graphene-based concretecitations
- 2023Microencapsulated phase change materials for enhanced thermal energy storage performance in construction materialscitations
- 2023Using explainable machine learning to predict compressive strength of blended concretecitations
- 2023Implementation of nonlinear computing models and classical regression for predicting compressive strength of high-performance concretecitations
- 2023An overview of factors influencing the properties of concrete incorporating construction and demolition wastescitations
- 2023High strength concrete compressive strength prediction using an evolutionary computational intelligence algorithmcitations
- 2023Evaluating mechanical, microstructural and durability performance of seawater sea sand concrete modified with silica fumecitations
- 2022Compressive Strength Estimation of Fly Ash/Slag Based Green Concrete by Deploying Artificial Intelligence Modelscitations
- 2022Prediction Models for Estimating Compressive Strength of Concrete Made of Manufactured Sand Using Gene Expression Programming Modelcitations
- 2022Predicting Bond Strength between FRP Rebars and Concrete by Deploying Gene Expression Programming Modelcitations
- 2022Acid Resistance of Alkali-Activated Natural Pozzolan and Limestone Powder Mortarcitations
- 2022Engineered and green natural pozzolan-nano silica-based alkali-activated concretecitations
- 2022Prediction Models for Evaluating Resilient Modulus of Stabilized Aggregate Bases in Wet and Dry Alternating Environmentscitations
- 2022Investigating the Bond Strength of FRP Laminates with Concrete Using LIGHT GBM and SHAPASH Analysiscitations
- 2021Predicting the compressive strength of a quaternary blend concrete using Bayesian regularized neural networkcitations
- 2021Strength and acid resistance of ceramic-based self-compacting alkali-activated concretecitations
- 2021Effect of alkaline activator ratio on the compressive strength response of POFA-EACC mortar subjected to elevated temperaturecitations
- 2021Assessment of acid resistance of natural pozzolan-based alkali-activated concretecitations
- 2020Ensemble machine learning model for corrosion initiation time estimation of embedded steel reinforced self-compacting concretecitations
- 2019Influence of composition and concentration of alkaline activator on the properties of natural-pozzolan based green concretecitations
- 2017POFA-engineered alkali-activated cementitious composite performance in acid environmentcitations
- 2016Impact of added water and superplasticizer on early compressive strength of selected mixtures of palm oil fuel ash-based engineered geopolymer compositescitations
- 2016Durability performance of Palm Oil Fuel Ash-based Engineered Alkaline-activated Cementitious Composite (POFA-EACC) mortar in sulfate environmentcitations
- 2014Mechanical properties and durability characteristics of SCC incorporating crushed limestone powdercitations
Places of action
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article
Evaluating long-term durability of nanosilica-enhanced alkali-activated concrete in sulfate environments towards sustainable concrete development
Abstract
The primary concern for the durability of ordinary Portland cement concrete is the breakdown of calcium silicate hydrate (C-S-H) formed during hydration when exposed to sulfate environments. The disintegration mechanisms of the binder structure in alkali-activated concrete (AAC) derived from aluminosiliceous precursors may vary, owing to the distinct reaction products formed during the alkali activation process. This paper presents the results of a study conducted to evaluate the long-term performance of alkali activated pulverized volcanic pumice (PVP) incorporating nanosilica (nSi) exposed to sodium sulfate (Na2SO4) and magnesium sulfate (MgSO4). In order to enhance the properties, the PVP was partially replaced with nSi up to 7.50 %. The degeneration of polymeric compounds was examined by conducting scanning electron microscope (SEM) and X-ray diffraction (XRD) on the alkali activated paste (AAP) together with visual examination, loss of weight and strength of concrete over a period of 5-years of exposure. There was about 45.2 % and 27.1 % decrease in strength of OPC concrete exposed to sodium and magnesium sulfate solutions after 5 years, respectively. 100 % PVP activated concrete performed better compared to conventional concrete. Exceptionally, nSi integration from 2.50 % to 7.50 % wt. enhanced the resistance sulfate attack. There was about 5 % decrease in strength was noted in the 5.00 % and 7.50 % nSi modified AAC. The greater decrease in strength of OPC concrete resulted due to decalcification of concrete making C-S-H gel unstable leading to the formation of expansive products needle-like ettringite (Ca6Al2(SO4)3(OH)12·26 H2O) and plate-like (CaSO4·2 H2O) gypsum. The substitution of PVP with nSi improved microstructure thereby resisting sulfate ion penetration. A consistent higher Ca/Si ratio in the nSi modified binder indicated the preservation of the critical C-S-H phase under both sulfate environments. The results show that the PVP-based AAC may well be used towards sustainable concrete development in the aggressive environmental conditions.