Multifunctional cork - alkali-activated fly ash composites: A sustainable material to enhance buildings' energy and acoustic performance
authors Novais, RM; Carvalheiras, J; Senff, L; Lacasta, AM; Cantalapiedra, IR; Giro-Paloma, J; Seabra, MP; Labrincha, JA
nationality International
journal ENERGY AND BUILDINGS
author keywords Alkali activation; Thermal and acoustic insulation; Moisture buffer value; Cork; Composite
keywords GEOPOLYMER FOAMS; THERMAL-CONDUCTIVITY; SILICA-FUME; INSULATING PROPERTIES; INDOOR AMBIENT; WASTE; CONCRETE; MORTARS; STRENGTH; AGENT
abstract This work evaluates, for the first time, the possibility of producing multifunctional alkali-activated composites combining ultra-low density, low thermal conductivity, high acoustic absorption, and good moisture buffering capacity. The composites were prepared using cork as a lightweight aggregate. This novel material might promote energy savings and tackle the CO2 emissions of the building sector, while simultaneously improve the comfort for inhabitants (e.g. humidity levels regulation and sound pollution reduction). The composites apparent density (as low as 168 kg/m(3)) and thermal conductivity (as low as 68 mW/m K) are amongst the lowest ever reported for alkali-activated materials (AAM) composites and foams, while their sound absorption ability is comparable to the best performing AAM foams reported to date, but in addition these eco-friendly composites also show good ability to passively adjust the humidity levels inside buildings. The multifunctional properties shown by the cork - AAM composites set them apart from other conventional building materials and might contribute to the global sustainability of the construction sector. (C) 2020 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0378-7788
year published 2020
volume 210
digital object identifier (doi) 10.1016/j.enbuild.2019.109739
web of science category Construction & Building Technology; Energy & Fuels; Engineering, Civil
subject category Construction & Building Technology; Energy & Fuels; Engineering
unique article identifier WOS:000517915800023
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journal analysis (jcr 2019):
journal impact factor 4.867
5 year journal impact factor 5.055
category normalized journal impact factor percentile 86.364
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