Alkali-activated basalt powder/slag systems: compressive strength and microstructural characterization

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dc.authoridAkturk, Busra/0000-0003-1484-7758|Ayhan, Bilal Umut/0000-0002-1000-1678
dc.authorwosidAkturk, Busra/JCO-1851-2023
dc.authorwosidAyhan, Bilal Umut/F-5350-2019
dc.contributor.authorAkturk, Busra
dc.contributor.authorAyhan, Bilal Umut
dc.date.accessioned2024-07-18T20:49:09Z
dc.date.available2024-07-18T20:49:09Z
dc.date.issued2023
dc.departmentİstanbul Bilgi Üniversitesien_US
dc.description.abstractThis study investigates the potential use of basalt powder as a sole precursor or blended in high amounts in slag-based alkali-activated systems. Eight alkali-activated mixes are prepared and comprehensively analyzed to determine the compressive strength development and microstructural characterization of basalt powder-based and basalt powder/slag blends activated by sodium hydroxide and a mixture of sodium hydroxide and sodium silicate. The mixes are characterized from a microstructural viewpoint via X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric and scanning electron microscopy analyses. The results show that while basalt powder-based mixes have low compressive strength values, ranging between 2 and 9 MPa, basalt powder/slag blend mixes exhibit a moderate compressive strength, i.e., 20 MPa at 28 days. Furthermore, sodium-silicate-activated basalt powder/slag blend mixes achieve high compressive strengths at early and further ages. The low strength values of the basalt powder-based mixes are attributed to the low concentration of reactive species and lack of Ca2+ ions in the medium, while the high compressive strength of the blended mixes is mainly associated with the formation of calcium aluminosilicate hydrate [C-(A)-S-H] or Na-enriched calcium sodium aluminosilicate hydrate [C-(N)-A-S-H] gel phases along with the calcic-plagioclase, which afford a denser microstructure. The obtained results show that basalt powder can be used in high concentrations, i.e., 50%, in alkali-activated systems, and basalt powder/slag blends can be a feasible, alternative binder system for use as a structural material.en_US
dc.description.sponsorshipIstanbul Bilgi University Research Fund [2019.02.004]en_US
dc.description.sponsorshipThis research was conducted at the Construction Materials Laboratory of Istanbul Bilgi University. The authors would like to acknowledge the financial support from the Istanbul Bilgi University Research Fund (Project Code: 2019.02.004). The authors would like to acknowledge the AKCANSA Cement Company for supplying slag and cement. Moreover, we would like to thank the METU Central Laboratory and Yildiz Technical University Central Laboratory for the XRD and SEM analyses.en_US
dc.identifier.doi10.1617/s11527-023-02165-1
dc.identifier.issn1359-5997
dc.identifier.issn1871-6873
dc.identifier.issue4en_US
dc.identifier.scopus2-s2.0-85154612885en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1617/s11527-023-02165-1
dc.identifier.urihttps://hdl.handle.net/11411/8104
dc.identifier.volume56en_US
dc.identifier.wosWOS:000975996200002en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.relation.ispartofMaterials and Structuresen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAlkali Activationen_US
dc.subjectBasalt Powderen_US
dc.subjectSlagen_US
dc.subjectMicrostructural Characterizationen_US
dc.subjectCompressive Strengthen_US
dc.subjectC-S-Hen_US
dc.subjectMechanical-Propertiesen_US
dc.subjectFly-Ashen_US
dc.subjectGeopolymer Concreteen_US
dc.subjectHydration Productsen_US
dc.subjectSilicate Modulusen_US
dc.subjectSi/Al Ratioen_US
dc.subjectSlag Cementen_US
dc.subjectReactivityen_US
dc.subjectNaohen_US
dc.titleAlkali-activated basalt powder/slag systems: compressive strength and microstructural characterization
dc.typeArticle

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