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Behaviour of Geopolymer Mortars after Exposure to Elevated Temperatures

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dc.contributor.authors Kaya, M; Uysal, M; Yilmaz, K; Atis, CD;
dc.date.accessioned 2020-03-06T08:07:44Z
dc.date.available 2020-03-06T08:07:44Z
dc.date.issued 2018
dc.identifier.citation Kaya, M; Uysal, M; Yilmaz, K; Atis, CD; (2018). Behaviour of Geopolymer Mortars after Exposure to Elevated Temperatures. MATERIALS SCIENCE-MEDZIAGOTYRA, 24, 436-428
dc.identifier.issn 1392-1320
dc.identifier.uri https://doi.org/10.5755/j01.ms.24.4.18829
dc.identifier.uri https://hdl.handle.net/20.500.12619/67184
dc.description.abstract In this study it was investigated the behavior of class F fly ash based geopolymer mortars subjected to elevated temperatures. Geopolimer composites were prepared with CEN-sand, water, fly ash as the binder, nSiO(2)Na(2)O and NaOH mixture combination as alkali activator. After mixing fresh geopolymer mixture, prismatic specimens were prepared using 40 mm x 40 mm x 160 mm prism molds. After molding, fresh geopolymer mortar samples with their mold were subjected to heat curing at 50 degrees C, 60 degrees C, 70 degrees C, 80 degrees C, 90 degrees C and 100 degrees C temperature for 48 hours in an oven. After 48 hours initial heat curing, the hardened samples were taken out of their mold. Then, they were further cured by leaving them in laboratory environment at about 22 +/- 2 degrees C temperature, until 28 days together with heat curing duration. At the end of 28 days, geopolymer mortar samples developed flexural strength values between 2,9 MPa and 8,51 MPa. Geopolymer mortar samples developed compressive strength values between 7,63 MPa and 50,64 MPa. High temperature experiments were conducted to observe behaviour of geopolymer mortars at elevated temperatures. The control cement mortar mixtures were also prepared and subjected to high temperature exposure in comparison to geopolymer mortar mixtures. Control cement mortars were cured at laboratory environment for 28 days without initial temperature curing. Control cement mortar mixtures and geopolymer mortar mixtures were exposed to elevated temperatures of 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C temperature. The unit weight, ultrasonic pulse velocity, flexural and compressive strength of all mixtures were measured before and after high temperature exposure. Scanning electron microscope (SEM) images of the mixtures were taken and X-ray fluorescence (XRF) spectrometer analyses were carried out. It was observed that there was an increase in the flexural and compressive strengths of some geopolymer mortars after high temperature exposure. In general, geopolymer mortars exhibited better performance at elevated temperatures in comparison to control cement mortar mixture.
dc.language English
dc.publisher KAUNAS UNIV TECH
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri http://creativecommons.org/licenses/by/4.0/
dc.subject Materials Science
dc.title Behaviour of Geopolymer Mortars after Exposure to Elevated Temperatures
dc.type Article
dc.identifier.volume 24
dc.identifier.startpage 428
dc.identifier.endpage 436
dc.contributor.department Sakarya Üniversitesi/Eğitim Fakültesi/Eğitim Bilimleri Bölümü
dc.contributor.saüauthor Kaya, Mehmet
dc.contributor.saüauthor Uysal, Mücteba
dc.contributor.saüauthor Yılmaz, Kemalettin
dc.relation.journal MATERIALS SCIENCE-MEDZIAGOTYRA
dc.identifier.wos WOS:000450233400014
dc.identifier.doi 10.5755/j01.ms.24.4.18829
dc.identifier.eissn 2029-7289
dc.contributor.author Kaya, Mehmet
dc.contributor.author Uysal, Mücteba
dc.contributor.author Yılmaz, Kemalettin
dc.contributor.author Cengiz Duran Atis


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info:eu-repo/semantics/openAccess Except where otherwise noted, this item's license is described as info:eu-repo/semantics/openAccess