Determination of stress-strain relationship based on alkali activator ratios in geopolymer concretes and development of empirical formulations

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dc.authorid0000-0003-2121-7033
dc.authorid0000-0001-5148-8753
dc.authorid0000-0002-8091-4990
dc.authorid0000-0001-9739-4699
dc.contributor.authorOzbayrak, Ahmet
dc.contributor.authorKucukgoncu, Hurmet
dc.contributor.authorAtas, Oguzhan
dc.contributor.authorAslanbay, Huseyin Hilmi
dc.contributor.authorAslanbay, Yuksel Gul
dc.contributor.authorAltun, Fatih
dc.date.accessioned2026-01-24T12:31:11Z
dc.date.available2026-01-24T12:31:11Z
dc.date.issued2023
dc.departmentAlanya Alaaddin Keykubat Üniversitesi
dc.description.abstractFly ash-based geopolymer has recently gained attention of researchers due to its potential application, as well as being an alternative binder with low emissions compared to ordinary Portland cement (OPC) in concrete production. Studies which are conducted on the design and mechanical properties of structural members produced from fly ash geopolymer concrete (GPC) are very important in terms of increasing the use of this concrete. The aim of this study is to obtain experimental data on the effect of sodium silicate/sodium hydroxide (SS/SH) and alkali activators/fly ash (AA/FA) ratios on the mechanical properties of a low calcium heat-cured fly ash geopolymer. In addition, it is to reveal the similarities and differences of OPC and GPC by comparing the mathematical formulations in existing regulations and concrete models with experimental data. Thus, geopolymer cylinder concrete samples were produced using 15 different mixtures with SS/SH ratios of 1.5, 2.5 and 3.5, while AA/FA ratios of 0.4, 0.5, 0.6, 0.7 and 0.8. At the end of the study, the optimum SS/SH ratio was obtained as 2.5. A decrease in the AA/FA ratio increases the compressive and splitting tensile strength, while an increment increases the ductility and consuming energy. In addition, the relationship between the experimental data and the splitting tensile strength and modulus of elasticity formulations depending on the compressive strength given in other studies and regulations as a part of literature was investigated, and then, two alternative empirical formulations considering the ratios of alkali activators were proposed at the end of the regression analysis. When the stress-strain relationship of OPC concrete models and GPC mixtures were compared, the closest unconfined concrete model for GPC concrete was the Hognestad model.
dc.description.sponsorshipTUBITAK (The Scientific and Technological Research Council of Turkey) [121M236]
dc.description.sponsorshipThis research was supported by TUBITAK (The Scientific and Technological Research Council of Turkey) under grant number 121M236. We would like to thank ME-KA Ltd. Co., Mehmet Barut and Aydin Yuengeni for their support in the Erciyes University Laboratory.
dc.identifier.doi10.1016/j.istruc.2023.01.104
dc.identifier.endpage2061
dc.identifier.issn2352-0124
dc.identifier.scopus2-s2.0-85147306077
dc.identifier.scopusqualityQ1
dc.identifier.startpage2048
dc.identifier.urihttps://doi.org/10.1016/j.istruc.2023.01.104
dc.identifier.urihttps://hdl.handle.net/20.500.12868/5719
dc.identifier.volume48
dc.identifier.wosWOS:000927382400001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Science Inc
dc.relation.ispartofStructures
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20260121
dc.subjectGeopolymer concrete mixtures
dc.subjectAlkali activator ratios
dc.subjectMechanical properties
dc.subjectTraditional concrete models
dc.subjectRegression analysis
dc.subjectEmpirical formulations
dc.titleDetermination of stress-strain relationship based on alkali activator ratios in geopolymer concretes and development of empirical formulations
dc.typeArticle

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