Quasi-Static Mechanical Characterization of Lightweight Fly Ash-Based Geopolymer Foams

This paper investigates the compressive and flexural behavior of a closed-cell fly ash-based geopolymer foam with a density of 240 kg/m3. The influence of loading speed (0.1, 10, 100, 250 and 500 mm/min) and anisotropy (in-plane and out-of-plane directions) on the compressive mechanical properties a...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-10, Vol.416 (1), p.12102
Main Authors: Linul, E, Korniejenko, K, Şerban, D A, Negru, R, Marşavina, L, Łach, M, Mikuła, J
Format: Article
Language:English
Subjects:
Anisotropy
Compressive properties
Crack propagation
Densification
Fly ash
Fracture toughness
Geopolymers
Mechanical properties
Plastic deformation
Room temperature
Stress-strain curves
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Summary:This paper investigates the compressive and flexural behavior of a closed-cell fly ash-based geopolymer foam with a density of 240 kg/m3. The influence of loading speed (0.1, 10, 100, 250 and 500 mm/min) and anisotropy (in-plane and out-of-plane directions) on the compressive mechanical properties at room temperature were investigated. Under compressive loads, the stress-strain curves shows a cellular material typical behavior with three different regions: linear-elastic, plateau and densification region. On the other hand, the three-point bending tests were carried out on both un-notched and notched specimens (for fracture toughness determination). In compression, the foam progressively collapsed with a complete destruction of the successive rows of cells, while in the case of bending it exhibited a brittle behavior without plastic deformation, the fracture occurring by the propagation of a single crack.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/416/1/012102