Fly-ash-based geopolymer composites incorporating cold-bonded lightweight fly ash aggregates

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dc.contributor.authorOz, Hatice Oznur
dc.contributor.authorYucel, Hasan Erhan
dc.contributor.authorGunes, Muhammet
dc.contributor.authorKoker, Turan Sevki
dc.date.accessioned2024-11-07T13:24:06Z
dc.date.available2024-11-07T13:24:06Z
dc.date.issued2021
dc.departmentNiğde Ömer Halisdemir Üniversitesi
dc.description.abstractIn this study, effects of cold-bonded lightweight fine aggregate (LWFA) on the geopolymer composites (GCs) were investigated in terms of fresh, physical, mechanical and durability properties. LWFA and different diameters quartz aggregates were used in the production of fly-ash-based GCs. However, LWFA was only replaced with the quartz aggregate of 1.2-2.5 mm. A mixture of 12 M NaOH and Na2SiO3 solution was prepared as 1/2.5. Unit weight, specific gravity, water absorption, apparent porosity, compressive and flexural strengths, ultrasonic pulse velocity and water sorptivity coefficient of GCs were determined. According to the test results, workability of GCs improved as the usage rate of LWFA increased. Due to the surface characteristics of LWFA, the mechanical properties of GC were enhanced by the geopolymerization reaction conducted between LWFA with alkali activators. Thus, the compressive strength of GC with 25% LWFA was 39.6% higher than that of the control GC at 28th day. This conclusion supported by TGA/DTA and FTIR analysis indicated that N-A-S-H gel of GC incorporating 25% LWFA was higher compared to control mixture. Also, GCs incorporating 40% and higher LWFA showed lower performance than control GC. (C) 2020 Elsevier Ltd. All rights reserved.
dc.identifier.doi10.1016/j.conbuildmat.2020.121963
dc.identifier.issn0950-0618
dc.identifier.issn1879-0526
dc.identifier.scopus2-s2.0-85098054741
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.conbuildmat.2020.121963
dc.identifier.urihttps://hdl.handle.net/11480/13923
dc.identifier.volume272
dc.identifier.wosWOS:000610197700119
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.ispartofConstruction and Building Materials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241106
dc.subjectGeopolymer composite
dc.subjectMicrostructural analyses
dc.subjectStrength and Durability
dc.subjectPhysical properties
dc.subjectLWFAs
dc.titleFly-ash-based geopolymer composites incorporating cold-bonded lightweight fly ash aggregates
dc.typeArticle

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