Valorization of Boron Mine Tailings in Alkali-Activated Mortars

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dc.authorid0000-0001-9907-0225en_US
dc.contributor.authorAydin, Serdar
dc.contributor.authorKızıltepe, Cavit Cağatay
dc.date.accessioned2021-03-20T20:12:29Z
dc.date.available2021-03-20T20:12:29Z
dc.date.issued2019
dc.departmentBTÜ, Mühendislik ve Doğa Bilimleri Fakültesi, İnşaat Mühendisliği Bölümüen_US
dc.description.abstractMine tailings cause significant storage and environmental problems because a large amount of tailings containing potentially numerous hazardous contaminants is generated during mining operations. Therefore, the utilization of mine tailings in different sectors should be taken into consideration to minimize the storage efforts and environmental pollution problems. In this two-stage study, the alkali activation opportunity of waste clay containing boron (WCB) discarded from boron mine production was investigated. In the first stage of this study, alkali activation of WCB calcined at different temperatures between 500 degrees C and 800 degrees C was investigated under steam-curing conditions. It was found that a calcination temperature of at least 700 degrees C is necessary to initiate the alkali activation of WCB, whereas the maximum compressive strength value was obtained at 800 degrees C. Subsequently, the effects of alkaline activator solution type (sodium hydroxide and sodium silicate) and quantity on the development of engineering properties of alkali-activated WCB mortars, such as compressive and flexural strength, water sorptivity, and drying shrinkage, were investigated by using WCB calcined at 800 degrees C. Furthermore, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA/DTA), and scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) analyses were carried out on the hardened paste mixtures. The minimum activator concentration for alkali activation of calcined WCB was 6% Na2O by weight of WCB with a minimum silicate modulus (Ms=SiO2/Na2O) of 1.2. A compressive strength value up to 38 MPa along with acceptable water absorption characteristics and drying shrinkage values can be obtained from alkali activation of calcined WCB at 800 degrees C. NaOH activator was not as effective as sodium silicate activator in activating WCB, even in high dosages.en_US
dc.identifier.doi10.1061/(ASCE)MT.1943-5533.0002871en_US
dc.identifier.issn0899-1561
dc.identifier.issn1943-5533
dc.identifier.issue10en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttp://doi.org/10.1061/(ASCE)MT.1943-5533.0002871
dc.identifier.urihttps://hdl.handle.net/20.500.12885/581
dc.identifier.volume31en_US
dc.identifier.wosWOS:000481581400035en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorKızıltepe, Cavit Cağatay
dc.language.isoenen_US
dc.publisherAsce-Amer Soc Civil Engineersen_US
dc.relation.ispartofJournal Of Materials In Civil Engineeringen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectBoronen_US
dc.subjectColemaniteen_US
dc.subjectMine tailingsen_US
dc.subjectCalcinationen_US
dc.subjectAlkali-activated cementen_US
dc.subjectSteam curingen_US
dc.titleValorization of Boron Mine Tailings in Alkali-Activated Mortarsen_US
dc.typeArticleen_US

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