Properties of Non-Structural Concrete Made with Mixed Recycled Aggregates and Low Cement Content
Autor
López Uceda, Antonio
Ayuso Muñoz, Jesús
López, Martín
Jímenez, José Ramón
Sierra, María José
Agrela Sáinz, Francisco
Editor
MDPIFecha
2016Materia
Mixed recycled aggregateCeramics
Low cement content
Non-structural concrete
Mechanica properties
Physical properties
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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.