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Damping and microstructure of fly ash-based geopolymers
journal contribution
posted on 2013-04-01, 00:00 authored by Z Pan, K N Feng, K Gong, B Zou, A H Korayem, J Sanjayan, W H Duan, Frank CollinsFrank CollinsAs environmentally-friendly materials, geopolymers have the potential to replace ordinary Portland cement (OPC) for the construction of railway sleepers and multi-flue chimneys, where the vibration control capabilities of the material must be considered. The critical damping value (ξ) is the main parameter in relation to vibration reduction. In this study, the traditional logarithmic decrement technique was used to measure the ξ of geopolymers. Geopolymers were prepared by activating fly ash using alkali solutions with different SiO2/Na2O ratios. The results show that the ξ of the geopolymers is similar to that of the OPC counterpart. Finite element analysis (FEM) based on the Rayleigh damping model was conducted to replicate the test results, and scanning electron microscopy and mercury-intrusion porosimetry were used to study the microstructure of the geopolymers. A discussion of the possible damping mechanisms based on the microstructural investigation and the FEM analysis is presented. © 2012 Springer Science+Business Media New York.
History
Journal
Journal of Materials ScienceVolume
48Issue
8Pagination
3128 - 3137Publisher DOI
ISSN
0022-2461eISSN
1573-4803Publication classification
C1.1 Refereed article in a scholarly journalCopyright notice
Springer Science+Business Media New York 2012Usage metrics
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