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Marble waste valorization through alkali activation

Komnitsas Konstantinos, Soultana Athanasia, Bartzas Georgios

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URIhttp://purl.tuc.gr/dl/dias/4603DADB-83A3-4912-9CF3-AD2160CD99FD-
Identifierhttps://doi.org/10.3390/min11010046-
Identifierhttps://www.mdpi.com/2075-163X/11/1/46-
Languageen-
Extent16 pagesen
TitleMarble waste valorization through alkali activationen
CreatorKomnitsas Konstantinosen
CreatorΚομνιτσας Κωνσταντινοςel
CreatorSoultana Athanasiaen
CreatorΣουλτανα Αθανασιαel
CreatorBartzas Georgiosen
PublisherMDPIen
Content SummaryIn the present study, the valorization potential of marble waste in the presence of metakaolin via alkali activation was explored. The activating solution used consisted of NaOH and sodium silicate solutions. The effects of marble waste to metakaolin ratio, particle size of raw materials, curing temperature, and Na2O/SiO2 and H2O/Na2O molar ratios present in the activating solution on the main properties and the morphology of the produced alkali-activated materials (AAMs) was evaluated. The durability and structural integrity of the AAMs after firing at temperatures between 200 and 600 °C, immersion in deionized water and 1 mol/L NaCl solution for different time periods and subjection to freeze–thaw cycles were also investigated. Characterization techniques including Fourier transform infrared spectroscopy, X-ray diffraction, mercury intrusion porosimetry and scanning electron microscopy were used in order to study the structure of the produced AAMs. Τhe highest compressive strength (~36 MPa) was achieved by the AAMs prepared with marble waste to metakaolin mass ratio of 0.3 after curing at 40 °C. The results indicated that the utilization of marble waste in the presence of metakaolin enables the production of AAMs with good physical (porosity, density and water absorption) and mechanical properties, thus contributing to the valorization of this waste type and the reduction of the environmental footprint of the marble industry.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2023-02-24-
Date of Publication2021-
SubjectMarble wasteen
SubjectMetakaolinen
SubjectAlkali activationen
Bibliographic CitationK. Komnitsas, A. Soultana, and G. Bartzas, “Marble waste valorization through alkali activation,” Minerals, vol. 11, no. 1, Jan. 2021, doi: 10.3390/min11010046.en

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