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    Development of Concrete Mixtures Based Entirely on Construction and Demolition Waste and Assessment of Parameters Influencing the Compressive Strength

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    Publication date
    2023-06
    End of Embargo
    01-07-2024
    Author
    Yildirim, Gurkan
    Ozcelikci, E.
    Alhawat, Musab M.
    Ashour, Ashraf F.
    Keyword
    Construction and demolition waste
    Geopolymer concrete
    Recycled concrete aggregate
    Compressive strength
    Rights
    (c) 2023 RILEM Publications SARL. Full-text reproduced in accordance with the publisher's self-archiving policy. The original publication will be available at the publisher's website (xxxxx). Permission to reprint or use this material in any form must be requested from RILEM.
    Peer-Reviewed
    Yes
    Open Access status
    embargoedAccess
    
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    Abstract
    Demolition and reconstruction of degrading structures alongside with the repetitive repair, maintenance, and renovation applications create significant amounts of construction and demolition waste (CDW), which needs proper tackling. The main emphasis of this study has therefore been placed on the development of concrete mixtures with components (i.e., aggregates and binder) coming entirely from CDW. As the binding phase, powdered CDW-based masonry units, concrete and glass were used collectively as precursors to obtain geopolymer binders, which were then incorporated with CDW-based fine and coarse concrete aggregates. Together with the entirely CDW-based concretes, designs were also proposed for companion mixtures with mainstream precursors (e.g., fly ash and slag) occupying some part of the CDW-based precursor combination. Sodium hydroxide (NaOH), sodium silicate (Na2SiO3) and calcium hydroxide (Ca[OH]2) were used at various concentrations and combinations as the alkaline activators. Several factors that have impact on the compressive strength results of concrete mixtures, such as mainstream precursor replacement rate, al-kaline molar concentrations, aggregate-to-binder ratios and curing conditions, were considered and these were also backed by the micro-structural analyses. Our results showed that through proper optimiza-tion of the design factors, it is possible to manufacture concrete mix-tures entirely out of CDW with compressive strength results able to reach up to 40 MPa under ambient curing. Current research is believed to be very likely to promote more innovative and up-to-date techniques to upcycle CDW, which are mostly downcycled through basic practices of road base/sub-base filling, encouraging further research and increas-ing the awareness in CDW issue.
    URI
    http://hdl.handle.net/10454/19376
    Version
    Accepted manuscript
    Citation
    Yildirim G, Ozcelikci E. Alhawat MB et al (2023) Development of Concrete Mixtures Based Entirely on Construction and Demolition Waste and Assessment of Parameters Influencing the Compressive Strength. SynerCrete’23. The International RILEM Conference on Synergising expertise towards sustainability and robustness of cement-based materials and concrete structures. 14-16 Jun 2023. Milos Island, Greece.
    Type
    Conference paper
    Notes
    The full-text of this paper will be released for public view at the end of the publisher embargo on 1 Jul 2024.
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