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TitlePerformance of fly ash-based geopolymer mortar
Author(s)Abdollahnejad, Zahra
Félix, T.
Torgal, Fernando Pacheco
Aguiar, J. L. Barroso de
KeywordsEnergy efficiency
Thermal insulators
Foam geopolymers
Mix design
Cost analysis
Issue date21-May-2015
PublisherAssociação Portuguesa dos Fabricantes de Argamassas de Construção (APFAC)
Abstract(s)This study has investigated the joint effect of several mix parameters on the properties of foam geopolymers. The mix parameters analysed through a laboratory experiment of 54 different mortar mixes were, sodium silicate/sodium hydroxide mass ratio (2.5, 3.5, 4.5), activator/binder mass ratio (0.6, 0.8, 1.0), chemical foaming agent type (hydrogen peroxide (H2O2) and sodium perborate (NaBO3)) and foaming agent mass ratio content (1%, 2%, 3%). Properties, SEM and FTIR analysis and cost analysis are included. The results show that the sodium perborate over performs hydrogen peroxide leading to a lower overall thermal conductibility of foam geopolymers. The use of an activator/binder ratio of 0.8 a sodium silicate/sodium hydroxide of 2.5 led to the lowest thermal conductivity. Mixtures with a low thermal conductivity of around 0.1 W/(m.ºK) and a compressive strength of around 6 MPa were achieved. The cost analysis show that the foaming agents are responsible for a small percentage of foam geopolymers total cost (less than 10%) being that the alkaline activators are responsible for more than 80%
TypeConference paper
AccessOpen access
Appears in Collections:C-TAC - Comunicações a Conferências Internacionais

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