Enhancing thermal energy storage efficiency at low temperatures with innovative macro-encapsulation of nano phase change material in cementitious composites

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 449, P. 138187 - 138187

Published: Sept. 14, 2024

Language: Английский

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Influence of Multi-walled Carbon Nanotube (MWCNT) on flexural behavior and microstructure characteristics of geopolymer concrete beams

Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 20, P. e03317 - e03317

Published: May 24, 2024

This experimental study delves into the impact of Multi-Walled Carbon Nanotubes (MWCNTs) on Geopolymer Concrete (GPC), investigating their effect compressive strength and load deflection behaviour. MWCNT concentrations ranging from 0.02% to 0.16% were employed examine influence structural performance 1500 mm (L) x 150 (B) (D) concrete beams. The findings derived this investigation yielded several significant conclusions. outcome research identified optimum dosage for enhancing at 0.12%, resulting in a substantial 29.78 MPa. However, surpassing concentration led decline strength. Notably, remarkable 26.62% increase was observed with 0.12% when compared reference specimens. In analysing performance, it that energy absorption capacity (EAC) exhibited consistent behavior up 0.6% addition MWCNT. At inclusion, EAC GPC reached its peak value 6116 kN.mm. Stiffness maintenance mirrored trends 0.1% MWCNT, beyond which decrease stiffness noted higher concentrations. Furthermore, Density Index (DI) beams sustained after DI began increase. Flexural Toughness Factor (FTF) retained 0.06%. declined flexural Additionally, Scanning Electron Microscopy (SEM) images revealed denser internal structure optimal Subsequent additions increased agglomeration, potentially hampering effective interaction between binder, activator within matrix. These contribute obtain optimised superior applications.

Language: Английский

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Experimental study of phase change material (PCM) biochar composite for net-zero built environment applications

Cleaner Materials, Journal Year: 2024, Volume and Issue: unknown, P. 100274 - 100274

Published: Oct. 1, 2024

Language: Английский

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Development of nanomodified eco-friendly thermal energy storing cementitious composite using PCM microencapsulated in biosourced encapsulation shell

Case Studies in Construction Materials, Journal Year: 2023, Volume and Issue: 19, P. e02447 - e02447

Published: Sept. 4, 2023

This study presents the development of a thermal energy storing cementitious composite that incorporates phase change material (PCM) microencapsulated in biosourced polymer shell (m-PCM). The biodegradability encapsulated PCM was assessed using Nuclear Magnetic Resonance (NMR), which confirmed high m-PCM under specific environmental conditions. To examine thermophysical properties m-PCM, Differential Scanning Calorimetry (DSC) and Thermogravimetric analysis (TGA) were performed. DSC results revealed exothermic enthalpies 84.7 J/g 140.2 J/g, with associated peak temperatures -3.2 °C -22.9 °C, respectively. Subsequently, incorporated into cement-based mortar at proportions 5%, 10%, 15% by weight binder. Uniaxial compression tests conducted to evaluate effect on mechanical mortar. indicated significant decrease strength upon incorporating m-PCM. However, this reduction mitigated addition silica fume (SF) multiwalled carbon nanotubes (MWCNTs) combination. Furthermore, cycling test performed behavior nanomodified varying ambient showed MWCNTs improved both performance composite.

Language: Английский

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Physical and mechanical properties of pre-treated plant-based lightweight aggregate concretes: A review

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 444, P. 137728 - 137728

Published: Aug. 10, 2024

Language: Английский

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