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Supplementary cementitious materials and mechanochemistry for sustainable concrete production
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-6797-9300
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
2020 (English)In: 4th International Balkans Conference on Challenges of Civil Engineering: Abstract Book / [ed] Enea Mustafaraj, Julinda Keçi, Erion Luga, Tirana: Epoka University Press , 2020, p. 27-27Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Excavation and removal of unstable clayey soils before construction works, e.g., in infrastructure, residential or commercial buildings, etc., can generate vast amounts of waste clay deposits. Treatment of those clays to achieve suitable supplementary cementitious materials (SCMs) for use in concrete production can extensively contribute to a circular economy. Mechanical activation (MC) by ball milling has shown suitability to be an alternative and sustainable method to process clays and to obtain dehydroxylation at reduced temperatures and without the addition of chemicals. Furthermore, BM can induce amorphization, increased chemical reactivity, and improved pozzolanic properties. Amorphization of crystalline phases can be achieved also for poorly reactive materials such as air-cooled blast furnace slags (ACBFS), which can be further utilized as a precursor in sodium silicate alkali-activated systems. This study shows how mechanical activation is promoting the reactivity of clay and ACBFS, and their potential to be used as a replacement for cement in concrete production. Evaluation of the pozzolanic activity before and after treatment was performed for the treated clay, suggesting increased pozzolanic properties. While alkali-activated systems based on mechanically treated ACBFS reached, after 28 days, comparable compressive strength values with the commonly used ground granulated blast furnace slag (GGBFS) 

Place, publisher, year, edition, pages
Tirana: Epoka University Press , 2020. p. 27-27
Keywords [en]
sustainability, SCM, mechanical activation, clay, air-cooled slag
National Category
Other Civil Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-90358ISBN: 978-9928-135-35-3 (print)OAI: oai:DiVA.org:ltu-90358DiVA, id: diva2:1653419
Conference
4th International Balkans Conference on Challenges of Civil Engineering (BCCCE), December 18-19, 2020, Tirana, Albania
Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2023-01-24Bibliographically approved

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Tole, IldaCwirzen, Andrzej

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