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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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Ngamkhanong, Chayut
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Effect of Graphene Quantum Dots (GQDs) on the Mechanical, Dynamic, and Durability Properties of Concretecitations
- 2021Recycled aggregates concrete compressive strength prediction using Artificial Neural Networks (ANNS)citations
- 2020Experimental and numerical investigations into dynamic modal parameters of fiber-reinforced foamed urethane composite beams in railway switches and crossingscitations
- 2020On Hogging Bending Test Specifications of Railway Composite Sleepers and Bearerscitations
- 2019Life cycle and sustainability assessment of under sleeper pads for railway vibration suppression
- 2019Nonlinear finite element analysis for structural capacity of railway prestressed concrete sleepers with rail seat abrasioncitations
- 2018Damage and failure modes of railway prestressed concrete sleepers with holes/web openings subject to impact loading conditionscitations
- 2018Dynamic capacity reduction of railway prestressed concrete sleepers due to surface abrasions considering the effects of strain rate and prestressing lossescitations
- 2018Condition monitoring of overhead line equipment (OHLE) structures using ground-bourne vibrations from train passagescitations
- 2017Impact Capacity Reduction in Railway Prestressed Concrete Sleepers with Surface Abrasionscitations
- 2017Influences of surface abrasions on dynamic behaviours of railway concrete sleepers
- 2017Influence of surface abrasion on creep and shrinkage of railway prestressed concrete sleeperscitations
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article
Effect of Graphene Quantum Dots (GQDs) on the Mechanical, Dynamic, and Durability Properties of Concrete
Abstract
Addressing ecological concerns stemming from concrete usage is paramount, prompting exploration into additives for mitigation. Graphene quantum dots (GQDs) have been recognized for their potential to improve the mechanical attributes of cement composites. Additionally, the electrochemical reduction of a saturated solution of carbon dioxide (CO<sub>2</sub>) and monoethanolamine (CO<sub>2</sub>-MEA) effectively removes CO<sub>2</sub> from the atmosphere. This study delves into the influence of GQDs on the mechanical and durability aspects of concrete. It is noted that the control mix of concrete without GQDs was specifically designed for concrete railway sleepers. Varied proportions of GQDs, ranging from 0.3% to 1.2% at 0.3% increments, were incorporated to assess their impact on fresh and hardened concrete properties. Mechanical properties such as compressive strength, splitting tensile strength, flexural strength, and dynamic properties were evaluated. Durability assessments encompassing water absorption and chloride ion penetration were conducted. Microstructural analysis via Field Emission Scanning Electron Microscopy (FESEM) imaging and Energy-dispersive X-ray spectroscopy (EDS) elucidated the concrete's internal composition. Notably, an optimal GQDs percentage of 0.3% was observed, signifying its efficacy in enhancing the performance of concrete. When 0.3% of GQDs was added to concrete, compressive strength, split tensile strength, and flexural strength were enhanced by 10.8%, 23%, and 11% respectively. The incorporation of GQDs resulted in a notable improvement in the fundamental frequencies and dynamic modulus of elasticity. Concurrently, a decrease in the damping ratio was observed for specimens containing GQDs. Additionally, the porosity and chloride penetration depth were lower by 6% and 30% for specimens with 0.3% GQDs. The improvement in workability, mechanical, and dynamic properties of concrete, along with reducing CO<sub>2</sub> from the atmosphere, makes GQDs an ideal eco-friendly material. This study is the first to open new pathways for the development of construction materials that are not only structurally superior but also environmentally responsible, marking a significant step forward in the field of civil engineering materials, especially in railway applications.