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    A comprehensive study on the compressive strength, durability-related parameters and microstructure of geopolymer mortars based on mixed construction and demolition waste

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    Ashour_et_al_Journal_of_Cleaner_Production.pdf (13.38Mb)
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    Publication date
    2023-04
    Author
    Ozcelikci, E.
    Kul, A.
    Gunal, M.F.
    Ozel, B.F.
    Yildirim, Gurkan
    Ashour, Ashraf F.
    Sahmaran, M.
    Keyword
    Geopolymer
    Construction and demolition waste (CDW)
    Compressive strength
    Drying shrinkage
    Water absorption
    Efflorescence
    Material sustainability index
    Rights
    © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
    Peer-Reviewed
    Yes
    Open Access status
    openAccess
    
    Metadata
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    Abstract
    As a viable option to upcycle construction and demolition waste (CDW) into value-added materials, geopolymer technology is emerging. Most studies investigate CDWs in a separated form or in combination with mainstream pozzolanic/cementitious materials focusing only on fundamental properties of geopolymer pastes, not considering to scale such materials to the level of their application in the forms of structural mortars/concretes or to characterize long-term performance/durability. This study investigated the development and characterization of ambient-cured mortars with mixed CDW-based geopolymer binders and untreated fine recycled concrete aggregates (FRCA). Mixture of CDW-based roof tile (RT), red clay brick (RCB), hollow brick (HB), concrete (C), and glass (G) was used as the precursor, while ground granulated blast furnace slag (S) was used in some mixtures to partly replace CDW precursors. Compressive strength, durability-related parameters including drying shrinkage, water absorption, and efflorescence, microstructure and materials sustainability were evaluated. Results showed that 28 d compressive strength results above 30 and 50 MPa is achievable with the entirely CDW-based and slag-substituted mortars, which were found improvable to have entirely CDW-based structural concretes. Drying shrinkage of the mortars is slightly higher than that of conventional cementitious/geopolymeric systems although it can be minimized significantly through mixture optimization. Water absorption values remain comparable with the literature. CDW-based geopolymer mortars outperform Portland cement mortars in terms of CO2 emission and energy requirement. Our findings show that via utilizing CDW-based constituents in mixed form as precursor and waste aggregates, it is possible to develop greener construction materials with acceptable strength and long-term performance.
    URI
    http://hdl.handle.net/10454/19346
    Version
    Published version
    Citation
    Ozcelikci E, Kul A, Gunal MF et al (2023) A comprehensive study on the compressive strength, durability-related parameters and microstructure of geopolymer mortars based on mixed construction and demolition waste. Journal of Cleaner Production. 396: 136522.
    Link to publisher’s version
    https://doi.org/10.1016/j.jclepro.2023.136522
    Type
    Article
    Collections
    Engineering and Informatics Publications

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