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

7th International Conference on Advanced Materials and Structures

Linul, E.^1 ; Korniejenko, K.^2 ; SSerban, D.A.^1 ; Negru, R.^1 ; Maravina, L.^1 ; Lach, M.^2 ; Mikula, J.^2

Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 1 Mihai Viteazu Avenue, Timisoara

300 222, Romania^1

Institute of Materials Engineering, Faculty of Mechanical Engineering, Cracow University of Technology, Poland^2

关键词: Cellular material;    Compressive loads;    Compressive mechanical properties;    Flexural behavior;    Mechanical characterizations;    Notched specimens;    Out-of-plane direction;    Three-point bending test;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/416/1/012102/pdf
DOI  :  10.1088/1757-899X/416/1/012102

来源: IOP

【 摘 要 】

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.