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Enhanced CO 2 Sequestration in Recycled Aggregates: Exploring Novel Capture-Promoting Additives

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  • David Bastos

    (c5Lab—Sustainable Construction Materials Association, Edifício Central Park, Rua Central Park 6, 2795-242 Linda-a-Velha, Portugal)

  • Ricardo Infante Gomes

    (LNEC, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066 Lisbon, Portugal
    CERIS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1049-00 Lisbon, Portugal)

  • Diogo Gonçalves

    (CERENA, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal)

  • Catarina Brazão Farinha

    (LNEC, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066 Lisbon, Portugal)

  • Cinthia Maia Pederneiras

    (LNEC, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066 Lisbon, Portugal
    CERIS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1049-00 Lisbon, Portugal)

  • Rosário Veiga

    (LNEC, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066 Lisbon, Portugal)

  • António Santos Silva

    (LNEC, National Laboratory for Civil Engineering, Av. do Brasil 101, 1700-066 Lisbon, Portugal)

  • José Alexandre Bogas

    (CERIS, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1049-00 Lisbon, Portugal)

  • Rui Galhano dos Santos

    (CERENA, Chemical Engineering Department, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal)

Abstract

CO 2 emissions, a significant contributor to climate change, have spurred the exploration of sustainable solutions. One putative solution involves using recycled aggregates (RAs) from construction and demolition waste (CDW) to substitute natural sand in construction materials. This not only extends the life cycle of the waste but also reduces the use of natural resources. The potential to capture CO 2 in RAs presents a promising route to mitigate the environmental impact of the construction industry and contribute to its much anticipated decarbonization. This research takes a unique approach by investigating the incorporation of an amine-based additive—specifically 2-amino-2-methyl-1,3-propanediol (AMPD)—to enhance CO 2 capture into a real-case RA from recycling plants, transforming CDW with low carbon-capture potential into a highly reactive CO 2 capture material. Through TG analysis, FTIR-ATR and the combination of both (TG-FTIR), we were able to validate the use of RA materials as a support medium and quantify the CO 2 capture potential (12%) of the AMPD amine; a dual valorization was achieved: new value was added to low-quality CDW and we enhanced CO 2 sequestration, offering hope for a more sustainable future.

Suggested Citation

  • David Bastos & Ricardo Infante Gomes & Diogo Gonçalves & Catarina Brazão Farinha & Cinthia Maia Pederneiras & Rosário Veiga & António Santos Silva & José Alexandre Bogas & Rui Galhano dos Santos, 2025. "Enhanced CO 2 Sequestration in Recycled Aggregates: Exploring Novel Capture-Promoting Additives," Waste, MDPI, vol. 3(2), pages 1-15, May.
    • Handle: RePEc:gam:jwaste:v:3:y:2025:i:2:p:17-:d:1666183
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    References listed on IDEAS

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    1. Infante Gomes, Ricardo & Brazão Farinha, Catarina & Veiga, Rosário & de Brito, Jorge & Faria, Paulina & Bastos, David, 2021. "CO2 sequestration by construction and demolition waste aggregates and effect on mortars and concrete performance - An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 152(C).
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