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Recycled Fine and Coarse Aggregates’ Contributions to the Fracture Energy and Mechanical Properties of Concrete
University of Borås, Sweden.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology. University of Borås, Sweden.ORCID iD: 0000-0001-6306-3701
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology. University of Borås, Sweden.ORCID iD: 0000-0001-9867-7631
University of Borås, Sweden.
2023 (English)In: Materials, E-ISSN 1996-1944, Vol. 16, no 19, article id 6437Article in journal (Refereed) Published
Abstract [en]

This paper investigates the fracture mechanical properties of concrete, using crushed concrete aggregates (CCA) and granulated blast furnace slag (GGBS) for partial cement replacement. CCAs made from prefabricated concrete replace 100% of the fine and coarse fractions in concrete recipes with w/c ratios of 0.42 and 0.48. Two pre-treatment methods, mechanical pre-processing (MPCCA) and accelerated carbonation (CO2CCA), are investigated for quality improvements in CCA. The resulting aggregates show an increased density, contributing to an increase in the concrete’s compressive strength. The novelty of this paper is the superposition of the effects of the composite parts of concrete, the aggregate and the cement mortar, and their contributions to concrete fracture. Investigations are directed toward the influence of fine aggregates on mortar samples and the influence of the combination of coarse and fine aggregates on concrete samples. The physical and mechanical properties of the aggregates are correlated with mortar and concrete fracture properties. The results show that CCA concrete achieves 70% of the fracture energy values of concrete containing natural aggregates, and this value increases to 80% for GGBS mixes. At lower w/c ratios, MPCCA and CO2CCA concretes show similar fracture energies. CO2CCA fine aggregates are the most effective at strengthening the mortar phase, showing ductile concrete behavior at a w/c ratio of 0.48. MPCCA aggregates contribute to higher compressive strengths for w/c ratios of 0.42 and 0.48. Thus, mechanical pre-processing can be improved to produce CCA, which contributes to more ductile concrete behavior.

Place, publisher, year, edition, pages
2023. Vol. 16, no 19, article id 6437
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:ri:diva-67422DOI: 10.3390/ma16196437OAI: oai:DiVA.org:ri-67422DiVA, id: diva2:1800807
Note

 This research was funded by the FORMAS-A Swedish research council for sustainabledevelopment. Project title: Construction waste as a carbon dioxide sink and raw material for newproduction. Decision number: FR-2021/0004.

Available from: 2023-09-28 Created: 2023-09-28 Last updated: 2024-07-04Bibliographically approved

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Oliva Rivera, AlexanderMalaga, Katarina

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