Carbonation potential of recycled aggregates from construction and demolition waste

Ricardo Infante Gomes, David Bastos, Catarina Brazão Farinha, M. Rosário Veiga, Jorge de Brito, Paulina Faria, António Santos Silva, Alexandre Bogas

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)
89 Downloads (Pure)

Abstract

One of the biggest challenges currently faced by Society is climate change, leading to the need of mitigation of carbon dioxide (CO2) emissions, among other consequences. The construction sector is responsible for a large part of these emissions. In addition, this sector is also responsible for a significant part of all waste globally produced, about one third in the European Union.
The use of construction and demolition wastes (CDW) as aggregates in mortars and concrete has been the objective of several studies. This incorporation reduces the volume of natural aggregates used in these construction products, decreasing the depletion of natural resources, while increasing the life cycle of the incorporated by-products. It thus contributes to the reduction of the environmental impacts of the construction sector. Nevertheless, recycled aggregates are not often incorporated in mortars and concrete due to their higher porosity and lower strength compared to natural aggregates.
Jointly with the Portuguese cement industry, this research intends to produce more sustainable mortars and concrete by using CDW aggregates as a carbon capture and storage source. This not only reduces the global greenhouse emissions of concrete but also potentially improves the CDW aggregates’ properties. To this extent, different types of CDW aggregates will be subjected to forced and accelerated sequestration of CO2, contributing to the capture of part of the CO2 emissions of the Portuguese cement industry, providing it with more sustainable processes. As a result, this study intends to contribute to the reduction of non-renewable natural resources, in the form of natural aggregates, while reusing CDW and capturing part of the CO2 released by the production of cement.
This article presents the characterization of three CDW from different origin and treatments, regarding the analysis of their carbonation potential.
Original languageEnglish
Title of host publicationConcrete Structures
Subtitle of host publicationNew Trends for Eco-Efficiency and Performance: Proceedings for the 2021 fib Symposium
EditorsEduardo Júlio, J. Valença, A. S. Louro
Publisherfib. The International Federation for Structural Concrete
Pages825-832
Number of pages8
ISBN (Print)978-2-940643-08-0
Publication statusPublished - Jun 2021
Event2021 fib Symposium - Lisbon, Portugal
Duration: 14 Jun 202116 Jun 2021

Conference

Conference2021 fib Symposium
Country/TerritoryPortugal
CityLisbon
Period14/06/2116/06/21

Keywords

  • carbon capture and storage
  • C&DW
  • CO2 sequestration
  • recycled aggregate
  • sustainable aggregates

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