Comparative analysis of long-term and high temperature performances of OPC based high strength mortar and silica fume based high strength geopolymer mortars

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dc.contributor.authorSaridemir, Mustafa
dc.contributor.authorCelikten, Serhat
dc.contributor.authorBulut, Metehan
dc.contributor.authorDeniz, Suvat
dc.date.accessioned2024-11-07T13:31:41Z
dc.date.available2024-11-07T13:31:41Z
dc.date.issued2024
dc.departmentNiğde Ömer Halisdemir Üniversitesi
dc.description.abstractThe effects of Class C fly ash (FA) contents on the performance of silica fume (SF) based high strength geopolymer mortars (HSGM) subjected to high temperatures up to 1000 degrees C are investigated. The percentages of FA substitution by SF are 10%, 15%, 20% and 25% by weight. The alkali activators used consist of sodium silicate (SS) and sodium hydroxide (SH) and are used in mixtures with SH/SS ratios of 0.3, 0.4, 0.5 and 0.6. In order to compare SF based HSGMs, ordinary Portland cement (OPC) based high strength mortar (HSM) as a control mortar is also produced with the same dosage and water content. The results at environmental temperature show that higher mechanical properties are obtained from SF based HSGMs compared to OPC based HSM. The optimum replacements of Class C FA and SH/SS ratios are 15 % and 0.3 or 0.4 in terms of mechanical properties. At 28 days, SF based HSGMs with flexural strength (ffs) of 15 MPa and compressive strength (fc) of 100 MPa can be produced without thermal curing. High reductions in the mechanical properties are seen on the OPC based HSM and SF based HSGMs subjected to high temperatures. In addition, SF based HSGMs with fc values above 25 MPa can also be obtained after exposure to 1000 degrees C. Alterations in the microstructure of OPC based HSM and SF based HSGMs under the influence of high temperatures are also examined with XRD, FTIR, SM, and FESEM/EDX analyses. Particularly, a spongy structure with volumetric expansion is seen with the formation of the glassy phase in the matrix of SF based HSGMs subjected to a temperature of 1000 degrees C.
dc.description.sponsorshipNigde Omer Halisdemir University [MMT2023/9-BAGEP]
dc.description.sponsorshipThis study is supported by Nigde Omer Halisdemir University project Effect of fly ash on the properties of alkali activated silica fume mortars, project code MMT2023/9-BAGEP.
dc.identifier.doi10.1016/j.istruc.2024.107080
dc.identifier.issn2352-0124
dc.identifier.scopus2-s2.0-85201231730
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.istruc.2024.107080
dc.identifier.urihttps://hdl.handle.net/11480/14975
dc.identifier.volume68
dc.identifier.wosWOS:001299125800001
dc.identifier.wosqualityN/A
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_20241106
dc.subjectHigh strength geopolymer mortars
dc.subjectSilica fume
dc.subjectEnvironmental-cured
dc.subjectHigh temperature
dc.titleComparative analysis of long-term and high temperature performances of OPC based high strength mortar and silica fume based high strength geopolymer mortars
dc.typeArticle

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