Upscaling the Use of Mixed Recycled Aggregates in Non-Structural Low Cement Concrete
Autor
López Uceda, Antonio
Ayuso Muñoz, Jesús
Barbudo Muñoz, M. Auxiliadora
De Britto, Jorge
Jiménez Romero, José Ramón
Agrela Sáinz, Francisco
Editor
MDPIFecha
2016Materia
Upscaled experimental studyNon-structural concrete
Long term mechanical performance
Concrete cores
Ready-mix plant
Low cement content
Mixed recycled aggregates
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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