Materiales de Construcción, Vol 66, No 321 (2016)

A proposal for the maximum use of recycled concrete sand in masonry mortar design


https://doi.org/10.3989/mc.2016.08414

E. Fernández-Ledesma
Construction Engineering Area. University of Córdoba, Spain

J. R. Jiménez
Construction Engineering Area. University of Córdoba, Spain

J. Ayuso
Construction Engineering Area. University of Córdoba, Spain

V. Corinaldesi
Department of Materials and Environment Engineering and Physics, Università Politecnica delle Marche, Italy

F. J. Iglesias-Godino
Department of Chemical, Environmental, and Materials Engineering, University of Jaen, Spain

Abstract


Natural sand mining from rivers and seashores is causing serious environmental problems in many parts of the world, whereas the fine fraction from recycling concrete waste is underutilized as a construction material. The aim of this paper is to determine the maximum replacement level of natural sand by recycled sand in the manufacturing of masonry mortar (M-10). For this purpose, five replacement levels were tested: 0%, 25%, 50%, 75% and 100% by volume. The mixes were made using cement CEM II/BL 32.5 N in a volumetric proportion of cement-to-aggregate of 1:5. A commercial admixture was used at a constant content. The amount of water was variable to achieve a consistency of 175±10 mm. The short- and long-term mortar properties were evaluated. The data were analyzed using a one-way ANOVA. In conclusion, a maximum percentage of 50% recycled concrete sand can be used in an indoor environment.

Keywords


Mortar; Compressive Strength; Mechanical Properties; Retraction; Waste Treatment

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