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Construction and Demolition Waste (CDW) Recycling—As Both Binder and Aggregates—In Alkali-Activated Materials: A Novel Re-Use Concept

Author

Listed:
  • Rafael A. Robayo-Salazar

    (Composites Materials Group (CENM), Universidad de Valle, Calle 13 #100-00, Cali E44, Colombia)

  • William Valencia-Saavedra

    (Composites Materials Group (CENM), Universidad de Valle, Calle 13 #100-00, Cali E44, Colombia)

  • Ruby Mejía de Gutiérrez

    (Composites Materials Group (CENM), Universidad de Valle, Calle 13 #100-00, Cali E44, Colombia)

Abstract

This article demonstrates the possibility of producing alkali-activated materials (AAM) from a mixture of mechanically processed concrete, ceramic, masonry, and mortar wastes, as a sustainable alternative for recycling construction and demolition wastes (CDWs) under real conditions. The addition of 10% Portland cement allowed the materials to cure at room temperature (25 °C). CDW binder achieved a compressive strength of up to 43.9 MPa and it was classified as a general use and low heat of hydration cement according to ASTM C1157. The concrete produced with this cement and the crushed aggregates also from CDW reported a compressive strength of 33.9 MPa at 28 days of curing and it was possible to produce a high-class structural block with 26.1 MPa according to ASTM C90. These results are considered one option in making full use of CDWs as binder and aggregates, using alkaline activation technology thereby meeting the zero-waste objective within the concept of the circular economy.

Suggested Citation

  • Rafael A. Robayo-Salazar & William Valencia-Saavedra & Ruby Mejía de Gutiérrez, 2020. "Construction and Demolition Waste (CDW) Recycling—As Both Binder and Aggregates—In Alkali-Activated Materials: A Novel Re-Use Concept," Sustainability, MDPI, vol. 12(14), pages 1-18, July.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:14:p:5775-:d:386065
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    Citations

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    Cited by:

    1. Gigliola D’Angelo & Marina Fumo & Mercedes del Rio Merino & Ilaria Capasso & Assunta Campanile & Fabio Iucolano & Domenico Caputo & Barbara Liguori, 2021. "Crushed Bricks: Demolition Waste as a Sustainable Raw Material for Geopolymers," Sustainability, MDPI, vol. 13(14), pages 1-12, July.
    2. Enrico Quagliarini & Marta Carosi & Stefano Lenci, 2023. "Novel Sustainable Masonry from Ancient Construction Techniques by Reusing Waste Modern Tiles," Sustainability, MDPI, vol. 15(6), pages 1-15, March.
    3. Arnas Majumder & Flavio Stochino & Andrea Frattolillo & Monica Valdes & Gianluca Gatto & Enzo Martinelli, 2024. "Sustainable Retrofitting Solutions: Evaluating the Performance of Jute Fiber Nets and Composite Mortar in Natural Fiber Textile Reinforced Mortars," Sustainability, MDPI, vol. 16(3), pages 1-18, January.
    4. Rafael Robayo-Salazar & William Valencia-Saavedra & Ruby Mejía de Gutiérrez, 2022. "Reuse of Powders and Recycled Aggregates from Mixed Construction and Demolition Waste in Alkali-Activated Materials and Precast Concrete Units," Sustainability, MDPI, vol. 14(15), pages 1-24, August.

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