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.
keywords
FLY-ASH; REACTION-KINETICS; WASTE GLASS; RED MUD; ACTIVATION; METAKAOLIN; HYDROXIDE; CONCRETE; MORTARS; BLENDS
subject category
Materials Science
authors
Novais, RM; Ascensao, G; Buruberri, LH; Senff, L; Labrincha, JA
our authors
Guilherme Ascensão
Research Fellowship
João António Labrincha Baptista
Full professor
Leire Hernando Buruberri
PhD Student
Rui Miguel Novais
Assistant Professoracknowledgements
This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement. Thanks to R.C. Pullar for correction to the English.