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Characterisation of the pore-forming process in geopolymer-based foams by means of X-ray micro-tomography (micro-CT)
Korat Bensa, Lidija, 1986- ; Ducman, Vilma
Geopolymers are inorganic systems which consist of (i) a reactive solid component which contains SiO2 and Al2O3 in sufficient amounts, and in reactiveform (e.g. different types of ash, and active ...clays), and (ii) an alkaline activation solution which mainly contains (apart from water) alkali hydroxides and silicates (Provis, 2014). Recent innovations have led to the development of different geopolymeric products, including highly porous geopolymer-based foams, which are formed by the addition of foaming agents, which decompose, or react with the liquid matrix or oxygen, resulting in the release of gases which form pores prior to the hardening of the gel. Such foams have good mechanical and thermal properties, so that they can be used for applications in acoustic panels and lightweight pre-fabricated components for thermal insulation (Henon, 2013). This study presents the first results which were obtained in an analysis of the pore-forming process in geopolymers foams, when two different foaming agents were added to a fly ash based geopolymer-based matrix; aluminium powder, and H2O2. The physical, mechanical,and microstructural properties of the geopolymer-based foams, and the effects of the foaming agentʼs characteristics and its added amount, are presented and discussed. In order to better understand the effect of porosity on the properties of geopolymers, an analysis of porosity, pore size distribution, thickness of walls, pore shape, and pore interconnectedness was performed by means of three-dimensional X-ray micro-tomography (micro-CT), which was supported by a suitable image analysis programme. This technique hasalready been successfully applied in the case of the analysis of ceramic foams (Maire et al., 2007), and in the present study, too, it has proved to bean excellent tool for the studying of the microstructure of foams, since it does not interfere with or destructively affect the sample.
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