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Reuse of Powders and Recycled Aggregates from Mixed Construction and Demolition Waste in Alkali-Activated Materials and Precast Concrete Units

Author

Listed:
  • Rafael Robayo-Salazar

    (Composite Materials Group (GMC-CENM), Universidad del Valle, Cali 76001, Colombia)

  • William Valencia-Saavedra

    (Composite Materials Group (GMC-CENM), Universidad del Valle, Cali 76001, Colombia)

  • Ruby Mejía de Gutiérrez

    (Composite Materials Group (GMC-CENM), Universidad del Valle, Cali 76001, Colombia)

Abstract

This article describes the recycling of coarse and fine fractions and powder from construction and demolition waste (CDW) using alkaline activation technology (geopolymerization). The CDW sample used corresponds to a mixture (mixed waste) of concrete (Co), ceramics (Ce) and masonry (M). Co, Ce and M (CDW-Mixed) powders were used as geopolymer precursors. As an alkaline activator, a mixture of sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) was used. From CDW-Mixed, a hybrid cement added with 10% ordinary Portland cement (OPC) was synthesized to promote curing at room temperature (25 °C). From the alkali-activated hybrid cement and the incorporation of mixed recycled aggregates (gravel and sand), applications of mortars, concretes, fiber-reinforced materials and prefabricated units, such as solid blocks, perforated (hollow) blocks and pavers, were produced. The results of the physical–mechanical characterization validate the application potential of these CDW-based materials in the construction sector. Compressive strengths of up to 40.5 MPa for mortar and 36.9 MPa for concrete were obtained after 90 days of curing at room temperature ≈ 25 °C. Similarly, a life cycle analysis (LCA) associated with raw materials demonstrated the environmental sustainability (44% lower carbon footprint) of mixed alkali-activated CDWs compared to conventional materials based on OPC.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9685-:d:881801
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    References listed on IDEAS

    as
    1. Vieira, Castorina Silva & Pereira, Paulo M., 2015. "Use of recycled construction and demolition materials in geotechnical applications: A review," Resources, Conservation & Recycling, Elsevier, vol. 103(C), pages 192-204.
    2. 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.
    3. Sajjad Pourkhorshidi & Cesare Sangiorgi & Daniele Torreggiani & Patrizia Tassinari, 2020. "Using Recycled Aggregates from Construction and Demolition Waste in Unbound Layers of Pavements," Sustainability, MDPI, vol. 12(22), pages 1-19, November.
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    Cited by:

    1. 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.
    2. Rafael Robayo-Salazar & Fabio Martínez & Armando Vargas & Ruby Mejía de Gutiérrez, 2023. "3D Printing of Hybrid Cements Based on High Contents of Powders from Concrete, Ceramic and Brick Waste Chemically Activated with Sodium Sulphate (Na 2 SO 4 )," Sustainability, MDPI, vol. 15(13), pages 1-21, June.

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