Porous biomass fly ash-based geopolymers with tailored thermal conductivity

authors	Novais, RM; Buruberri, LH; Ascensao, G; Seabra, MP; Labrincha, JA
nationality	International
journal	JOURNAL OF CLEANER PRODUCTION
author keywords	Geopolymers; Biomass fly ash; Lightweight; Thermal conductivity; Porosity
keywords	METAKAOLIN-BASED GEOPOLYMERS; RED MUD; CHEMICAL-COMPOSITION; ENERGY-CONSUMPTION; SODIUM-HYDROXIDE; CO2 EMISSIONS; COST-ANALYSIS; PART 1.; MICROSTRUCTURE; WASTE
abstract	In this work novel, porous biomass fly ash-based-geopolymers were produced by using hydrogen peroxide as pore forming agent. This innovative material can help to mitigate the energy losses inside buildings, while simultaneously reducing the volume of generated wastes, thus contributing towards sustainable construction. Results demonstrate that the content of hydrogen peroxide controls the geopolymer physical properties such as porosity, mechanical resistance and thermal conductivity. The latter allows the production of geopolymers displaying suitable properties for thermal insulation applications. Geopolymers exhibiting thermal conductivity as low as 0.107 W/m K and a density of 560 kg/m(3) were produced, showing the potential of these materials in applications requiring lightweight and low thermal conductivity materials. Besides this material is produced using a simple and cost effective approach, promoting waste valorization by reuse of biomass fly ash, which further demonstrates its potential. (C) 2016 Elsevier Ltd. All rights reserved.
publisher	ELSEVIER SCI LTD
issn	0959-6526
year published	2016
volume	119
beginning page	99
ending page	107
digital object identifier (doi)	10.1016/j.jclepro.2016.01.083
web of science category	GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Engineering, Environmental; Environmental Sciences
subject category	Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
unique article identifier	WOS:000372690100011