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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
The role of iron in the formation of inorganic polymers (geopolymers) from volcanic ash: A
57
Fe Mössbauer spectroscopy study
Journal of Materials Science, Volume 48, No. 15, Year 2013
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Description
The behavior of the iron present in two volcanic ashes was investigated during geopolymer synthesis using sodium hydroxide as the sole alkali activator. XRD, SEM, and room-temperature 57Fe Mössbauer spectroscopy were used to monitor the behavior of the iron during the synthesis reaction. Geopolymers with very good compressive strengths were formed, especially with the finer ash, in which the iron is present in the crystalline minerals ferroan forsterite and augite. Mössbauer spectroscopy identified the ferrous sites in these minerals, plus a ferric site, probably located in an X-ray amorphous phase. The ferroan forsterite in the original ashes did not react with NaOH, but a substantial proportion of the augite reacted to form new ferric sites with parameters similar to distorted tetrahedral or 5-coordinated environments, suggesting the possible incorporation of ferric iron in the tetrahedral network of the geopolymer product. These results indicate that iron is not necessarily deleterious to geopolymer formation, as has sometimes been suggested. © 2013 Springer Science+Business Media New York.
Authors & Co-Authors
Lemougna, Patrick Ninla
Cameroon, Yaounde
Université de Yaoundé I
MacKenzie, Kenneth J.D.
New Zealand, Wellington
Victoria University of Wellington
Jameson, Guy N.L.
New Zealand, Dunedin
University of Otago
Rahier, Hubert
Belgium, Brussels
Vrije Universiteit Brussel
Chinje Melo, Uphie
Cameroon, Yaounde
Université de Yaoundé I
Statistics
Citations: 120
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1007/s10853-013-7319-4
ISSN:
00222461
e-ISSN:
15734803