Evaluation of eco-efficient concretes produced with fly ash and uncarbonated recycled aggregates
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hdl:2117/358187
Tipus de documentArticle
Data publicació2021-12
EditorMultidisciplinary Digital Publishing Institute (MDPI)
Condicions d'accésAccés obert
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Abstract
The fabrication of conventional concrete, as well as remains from demolition, has a high environmental impact. This paper assessed the eco-efficiency of concrete made with uncarbonated recycled concrete aggregates (RCA) and fly ash (FA). Two concrete series were produced with an effective water/cement ratio of 0.50 (Series 1) and 0.40 (Series 2). In both series, concretes were produced using 0% and 50% of RCA with 0%, 25% and 50% FA. After analysing the compressive strength, and carbonation and chloride resistance of those concretes, their eco-efficiency based on the binder intensity and CO2-eq intensity was assessed. We found that the use of 50% uncarbonated RCA improved the properties of concretes produced with FA with respect to using natural aggregates. The concrete made of 25% FA plus RCA was considered the most eco-efficient based on the tests of compressive, carbonation and chloride properties with the values of 4.1 kg CO2 m-3 MPa-1, 76.3 kg CO2 m-3 mm-1 year0.5 and 0.079 kg CO2 m-3 C-1, respectively. The uncarbonated RCA improved carbonation resistance, and FA improved chloride resistance. It can be concluded that the use of 50% un-carbonated RCA combined with FA considerably enhanced the properties of hardened concrete and their eco-efficiency with respect to concretes produced with natural aggregates.
CitacióEtxeberria, M. Evaluation of eco-efficient concretes produced with fly ash and uncarbonated recycled aggregates. "Materials", Desembre 2021, vol. 14, núm. 24, p. 7499:1-7499:22.
ISSN1996-1944
Versió de l'editorhttps://www.mdpi.com/1996-1944/14/24/7499/htm
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