Porous biomass fly ash-based geopolymers with tailored thermal conductivity

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.

keywords

METAKAOLIN-BASED GEOPOLYMERS; RED MUD; CHEMICAL-COMPOSITION; ENERGY-CONSUMPTION; SODIUM-HYDROXIDE; CO2 EMISSIONS; COST-ANALYSIS; PART 1.; MICROSTRUCTURE; WASTE

subject category

Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology

authors

Novais, RM; Buruberri, LH; Ascensao, G; Seabra, MP; Labrincha, JA

our authors

acknowledgements

This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. The authors are thankful to Dr. Alexandra Fonseca for assistance during the thermal conductivity measurements, and Dr. Robert Pullar for help with the English language.

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