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Materials 2016, 9(2), 91; doi:10.3390/ma9020091

Upscaling the Use of Mixed Recycled Aggregates in Non-Structural Low Cement Concrete

1
Construction Engineering, University of Córdoba, Ed. Leonardo Da Vinci, Campus of Rabanales, Córdoba 14071, Spain
2
CERIS/ICIST, DECivil, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, Lisbon 1049-001, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Received: 17 December 2015 / Revised: 19 January 2016 / Accepted: 25 January 2016 / Published: 2 February 2016
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Abstract

This research aims to produce non-structural concrete with mixed recycled aggregates (MRA) in upscaled applications with low-cement content. Four slabs were executed with concrete made with different ratios of coarse MRA (0%, 20%, 40% and 100%), using the mix design, the mixing procedures and the facilities from a nearby concrete production plant. The analysis of the long-term compressive and splitting tensile strengths in concrete cores, extracted from the slabs, allowed the highlighting of the long-term high strength development potential of MRA incorporation. The study of cast specimens produced in situ under the same conditions as the slabs showed, firstly, that the use of MRA has a great influence on the properties related to durability, secondly, that the loss of compressive strength for total MRA incorporation relative to control concrete increases proportionally with the class strength, and, thirdly, that the mechanical properties (including Schmidt hammer results) from the concrete slabs showed no significant differences relative to the control concrete for coarse aggregates replacements up to 40%. Therefore, this upscaled experimental study supports the application of concrete with 100% coarse MRA incorporation and low cement content in non-structural civil works such as bike lanes, gutters, ground slabs, leveling surfaces, and subgrades for foundations. To the best of the authors’ knowledge, there have not been any upscaled applications of concrete with MRA and low cement content. View Full-Text
Keywords: upscaled experimental study; non-structural concrete; long term mechanical performance; concrete cores; ready-mix plant; low cement content; mixed recycled aggregates upscaled experimental study; non-structural concrete; long term mechanical performance; concrete cores; ready-mix plant; low cement content; mixed recycled aggregates
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

López-Uceda, A.; Ayuso, J.; Jiménez, J.R.; Agrela, F.; Barbudo, A.; De Brito, J. Upscaling the Use of Mixed Recycled Aggregates in Non-Structural Low Cement Concrete. Materials 2016, 9, 91.

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