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Materials 2016, 9(2), 74; doi:10.3390/ma9020074

Properties of Non-Structural Concrete Made with Mixed Recycled Aggregates and Low Cement Content

1
Construction Engineering, University of Córdoba, Ed. Leonardo Da Vinci, Campus of Rabanales, Córdoba 14071, Spain
2
Public Works Agency and Regional Ministry of Public Works and Housing of the Regional Government of Andalusia, Sevilla 41013, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 21 September 2015 / Revised: 13 January 2016 / Accepted: 15 January 2016 / Published: 26 January 2016
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Abstract

In spite of not being legally accepted in most countries, mixed recycled aggregates (MRA) could be a suitable raw material for concrete manufacturing. The aims of this research were as follows: (i) to analyze the effect of the replacement ratio of natural coarse aggregates with MRA, the amount of ceramic particles in MRA, and the amount of cement, on the mechanical and physical properties of a non-structural concrete made with a low cement content; and (ii) to verify if it is possible to achieve a low-strength concrete that replaces a greater amount of natural aggregate with MRA and that has a low cement content. Two series of concrete mixes were manufactured using 180 and 200 kg/m3 of CEM II/A-V 42.5 R type Portland cement. Each series included seven concrete mixes: one with natural aggregates; two MRA with different ceramic particle contents; and one for each coarse aggregate replacement ratio (20%, 40%, and 100%). To study their properties, compressive and splitting tensile strength, modulus of elasticity, density, porosity, water penetration, and sorptivity, tests were performed. The results confirmed that the main factors affecting the properties analyzed in this research are the amount of cement and the replacement ratio; the two MRAs used in this work presented a similar influence on the properties. A non-structural, low-strength concrete (15 MPa) with an MRA replacement ratio of up to 100% for 200 kg/m3 of cement was obtained. This type of concrete could be applied in the construction of ditches, sidewalks, and other similar civil works. View Full-Text
Keywords: mixed recycled aggregate; ceramics; low cement content; non-structural concrete; mechanical properties; physical properties mixed recycled aggregate; ceramics; low cement content; non-structural concrete; mechanical properties; physical properties
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.; López, M.; Jimenez, J.R.; Agrela, F.; Sierra, M.J. Properties of Non-Structural Concrete Made with Mixed Recycled Aggregates and Low Cement Content. Materials 2016, 9, 74.

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