Influence of blowing agent on the fresh- and hardened-state properties of lightweight geopolymers
authors Novais, RM; Ascensao, G; Buruberri, LH; Senff, L; Labrincha, JA
nationality International
journal MATERIALS & DESIGN
author keywords Geopolymers; Biomass fly ash; Calorimetry; Rheology; Porosity
keywords FLY-ASH; REACTION-KINETICS; WASTE GLASS; RED MUD; ACTIVATION; METAKAOLIN; HYDROXIDE; CONCRETE; MORTARS; BLENDS
abstract The production of lightweight geopolymers is an emergent area, and the influence of the pore forming agent on geopolymer kinetics and the rheology of the pastes has been rather neglected up to now. In this work the influence of the blowing agent content, NaOH molarity and water content on the fresh and hardened-state properties of fly ash-containing geopolymers was evaluated. Results demonstrate that the blowing agent decreases the slurries yield stress, which extends the open time before in situ application. It was also found that the geopolymerisation rate is only slightly affected by the blowing agent, while a strong impact is exerted by the activator molarity. The proper association between NaOH molarity and blowing agent content leads to the production of lightweight geopolymers exhibiting very low thermal conductivity (up to 0.08 W/m K) and apparent density (440 kg/m(3)). The thermal conductivity shown by these innovative materials suggest their suitability for thermal insulating applications. (C) 2016 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0264-1275
year published 2016
volume 108
beginning page 551
ending page 559
digital object identifier (doi) 10.1016/j.matdes.2016.07.039
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000382793200061
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journal analysis (jcr 2017):
journal impact factor 4.525
5 year journal impact factor 4.753
category normalized journal impact factor percentile 81.579
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