Mechanistic impacts of long-term gamma irradiation on physicochemical, structural, and mechanical stabilities of radiation-responsive geopolymer pastes

Simple item page
dc.contributor.authorYeoh, MLYen_AU
dc.contributor.authorUkritnukun, Sen_AU
dc.contributor.authorRawal, Aen_AU
dc.contributor.authorDavies, JBen_AU
dc.contributor.authorKang, BJen_AU
dc.contributor.authorBurrough, Ken_AU
dc.contributor.authorAly, Zen_AU
dc.contributor.authorDayal, Pen_AU
dc.contributor.authorVance, ERen_AU
dc.contributor.authorGregg, DJen_AU
dc.contributor.authorKoshy, Pen_AU
dc.contributor.authorSorrell, CCen_AU
dc.date.accessioned2025-01-13T00:36:39Zen_AU
dc.date.available2025-01-13T00:36:39Zen_AU
dc.date.issued2021-04-05en_AU
dc.date.statistics2024-10-22en_AU
dc.description.abstractThe mechanistic effects of long-term γ irradiation on the mineralogical, microstructural, structural, physical, and chemical properties of 40 wt% blast furnace slag + 60 wt% fly ash geopolymer pastes have been examined. Ambient curing for 28 days during normal equilibration was followed by exposure to 60Co irradiation (1574, 4822, 10,214 kGy). The material characteristics are controlled largely through the competing mechanisms of beneficial equilibration at initial lower dosages, which enhances gelation and crosslinking, and detrimental equilibration at subsequent higher dosages, which causes structural and microstructural destabilisation. Irradiation for 2 months (1574 kGy) increases the compressive strength ~45% (~57 to ~83 MPa) through conversion of less-crosslinked (Q0/Q1/Q1′) to more-crosslinked (Q2/Q3/Q4) silicate species. The transition between these regimes occurs after ~5 months of irradiation (~4000 kGy). Beyond this, the rates of beneficial equilibration and detrimental equilibration equalise upon completion of normal geopolymerisation. Additional geopolymerisation from γ irradiation is controlled by the rate-limiting release of Si4+ from the unreacted aluminosilicates and silicates and their rapid incorporation in the geopolymer network. The aqueous leaching of the geopolymer pastes is not affected significantly by γ irradiation. These data reveal the potential for these materials as intermediate-level wasteforms that can outperform Portland cement-based materials. © 2020 Elsevier B.V.en_AU
dc.description.sponsorshipThe authors wish to thank Mr. Tim Palmer from Metallography (ANSTO) for SEM, compressive strength, and durability sample preparation and Dr. Weijian Lu from Nuclear Analysis (ANSTO Research Funds AP11094) for assistance with MicroShield® calculations. The authors also are grateful to Nuclear Science and Technology Landmark Infrastructure (ANSTO) for materials characterisation. The authors are grateful to the Mark Wainwright Analytical Centre for subsidised use of the characterisation facilities.en_AU
dc.format.mediumPrint-Electronicen_AU
dc.identifier.articlenumber124805en_AU
dc.identifier.citationYeoh, M. L. Y., Ukritnukun, S., Rawal, A., Davies, J., Kang, B. J., Burrough, K., Aly, Z., Dayal, P., Vance, E. R., Gregg, D. J., Koshy, P., & Sorrell, C. C. (2021). Mechanistic impacts of long-term gamma irradiation on physicochemical, structural, and mechanical stabilities of radiation-responsive geopolymer pastes. Journal of Hazardous Materials, 407, 124805. doi:10.1016/j.jhazmat.2020.124805en_AU
dc.identifier.issn0304-3894en_AU
dc.identifier.issn1873-3336en_AU
dc.identifier.journaltitleJournal of Hazardous Materialsen_AU
dc.identifier.urihttps://doi.org/10.1016/j.jhazmat.2020.124805en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15923en_AU
dc.identifier.volume407en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectGamma radiationen_AU
dc.subjectIrradiationen_AU
dc.subjectChemical propertiesen_AU
dc.subjectGelationen_AU
dc.subjectAqueous solutionsen_AU
dc.subjectLeachingen_AU
dc.subjectCobalten_AU
dc.subjectPolymersen_AU
dc.subjectFly ashen_AU
dc.subjectSlagsen_AU
dc.subjectRadioactive waste disposalen_AU
dc.subjectPortland Cementen_AU
dc.titleMechanistic impacts of long-term gamma irradiation on physicochemical, structural, and mechanical stabilities of radiation-responsive geopolymer pastesen_AU
dc.typeJournal Articleen_AU
dcterms.dateAccepted2020-12-06en_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.66 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles