Comprehensive experimental analysis of the effects of elevated temperatures in geopolymer concretes with variable alkali activator ratios

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dc.authorid0000-0003-2121-7033
dc.authorid0000-0002-9356-3878
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.authorAslanbay, Huseyin Hilmi
dc.contributor.authorAslanbay, Yuksel Gul
dc.contributor.authorAtas, Oguzhan
dc.date.accessioned2026-01-24T12:31:15Z
dc.date.available2026-01-24T12:31:15Z
dc.date.issued2023
dc.departmentAlanya Alaaddin Keykubat Üniversitesi
dc.description.abstractBy growing population and rapid urbanization, demand for concrete increases exponentially. Researches on use of fly ash material in waste product class for concrete production are important to produce concrete more environmentally friendly. However, there is a need for more research to use geopolymer concrete (GPC) in every field where ordinary Portland cement concrete (OPC) is used. Therefore, it is crucial to experimentally investigate thermal properties as well as me-chanical properties of geopolymer concrete. As investigated thermal properties, the main factor affecting strength development of GPC is alkali activator ratios. In this study, GPC prism samples with nine different compositions, produced by various alkali ratios. After flexural strength tests, they were cut into cubes and exposed to 400 degrees C, 600 degrees C and 800 degrees C, then they were subjected to compressive strength tests. Results obtained from different AA/FA and SS/SH ratios were eval-uated as mechanical properties at ambient temperature and physical, mechanical and micro-structural properties at elevated temperature. An empirical formula, which considers the effect of activator ratios, was proposed to calculate flexural strength depending on compressive strength of samples at ambient temperature. As an increase of SS/SH and AA/FA ratios, compressive strength increased, while flexural strength decreased. The increase in AA/FA ratio decreased compressive strength of samples exposed to high temperatures, while increase in SS/SH ratio did not deter-mine at elevated temperatures. There is an inverse change with AA/FA ratio and parallel change with SS/SH ratio between compressive strengths of samples at ambient temperature and exposed to high temperature.
dc.description.sponsorshipTUBITAK (The Scientific and Technological Research Council of Turkiye) [121M236]
dc.description.sponsorshipAcknowledgments This research was supported by TUBITAK (The Scientific and Technological Research Council of Turkiye) under grant number 121M236. We would like to thank the officials of ME-KA Ltd. Co. and the researchers involved in the project for their contributions tothe study.
dc.identifier.doi10.1016/j.jobe.2023.106108
dc.identifier.issn2352-7102
dc.identifier.scopus2-s2.0-85148321799
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.jobe.2023.106108
dc.identifier.urihttps://hdl.handle.net/20.500.12868/5742
dc.identifier.volume68
dc.identifier.wosWOS:001010844600001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofJournal of Building Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20260121
dc.subjectAlkaline activator ratio
dc.subjectElevated temperature
dc.subjectFly ash
dc.subjectGeopolymer concrete
dc.subjectMechanical properties
dc.subjectMicrostructure
dc.titleComprehensive experimental analysis of the effects of elevated temperatures in geopolymer concretes with variable alkali activator ratios
dc.typeArticle

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