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Materials 2016, 9(2), 98; doi:10.3390/ma9020098

Increased Durability of Concrete Made with Fine Recycled Concrete Aggregates Using Superplasticizers

1
CERIS/ICIST, DECivil-Instituto Superior Técnico (IST), University of Lisbon, Av. Rovisco Pais, Lisbon 1049-001, Portugal
2
CERIS/ICIST, ADEC-ISEL, Lisbon’s Polytechnic Institute, R. Conselheiro Emídio Navarro, 1, Lisbon 1950-062, Portugal
3
Construction Engineering Area, EPS de BELMEZ, University of Córdoba, Belmez CP 14240, Spain
4
Construction Engineering Area, University of Córdoba, Ed, Leonardo Da Vinci, Campus de Rabanales, Ctra. N-IV, km-396, Córdoba CP 14014, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir K. Sarker
Received: 11 December 2015 / Accepted: 27 January 2016 / Published: 8 February 2016
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)

Abstract

This paper evaluates the influence of two superplasticizers (SP) on the durability properties of concrete made with fine recycled concrete aggregate (FRCA). For this purpose, three families of concrete were tested: concrete without SP, concrete made with a regular superplasticizer and concrete made with a high-performance superplasticizer. Five volumetric replacement ratios of natural sand by FRCA were tested: 0%, 10%, 30%, 50% and 100%. Two natural gravels were used as coarse aggregates. All mixes had the same particle size distribution, cement content and amount of superplasticizer. The w/c ratio was calibrated to obtain similar slump. The results showed that the incorporation of FRCA increased the water absorption by immersion, the water absorption by capillary action, the carbonation depth and the chloride migration coefficient, while the use of superplasticizers highly improved these properties. The incorporation of FRCA jeopardized the SP’s effectiveness. This research demonstrated that, from a durability point of view, the simultaneous incorporation of FRCA and high-performance SP is a viable sustainable solution for structural concrete production. View Full-Text
Keywords: fine recycled aggregate; superplasticizers; durability; water absorption; chloride resistance; carbonation resistance fine recycled aggregate; superplasticizers; durability; water absorption; chloride resistance; carbonation resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cartuxo, F.; de Brito, J.; Evangelista, L.; Jiménez, J.R.; Ledesma, E.F. Increased Durability of Concrete Made with Fine Recycled Concrete Aggregates Using Superplasticizers. Materials 2016, 9, 98.

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