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

Study of potential advantages of pre-soaking on the properties of pre-cast concrete made with recycled coarse aggregate


https://doi.org/10.3989/mc.2016.01715

Z. Sánchez-Roldán
ETS de Ingeniería de Edificación, University of Granada, Spain

M. Martín-Morales
ETS de Ingeniería de Edificación, University of Granada, Spain

I. Valverde-Palacios
ETS de Ingeniería de Edificación, University of Granada, Spain

I. Valverde-Espinosa
ETS de Ingeniería de Edificación, University of Granada, Spain

M. Zamorano
ETS Ingenieros de Caminos, Canales y Puertos, University of Granada, Spain

Abstract


Recycled aggregate (RA) from construction and demolition waste is traditionally used for the manufacture of concrete for different applications. Due primarily to high water content required by RA, the quality of the concrete is determined by the amount of replacement RA. The aim of this study is to determine if RA pre-soaking enhances the properties of pre-cast concrete for street furniture, with low mechanical and structural requirements, in which 100% of the coarse fraction is replaced. The results of physical and mechanical tests performed on concrete specimens in which the RA was pre-soaked using five different methods applied are compared with a reference concrete sample and a concrete sample made with non-pre-soaked RA. The results show that non-pre-soaked RA offers improved physical-mechanical properties for pre-cast concrete, except for the workability; problems arising from poorer workability could be improved with the use of plasticizers, which can be easily included in the production process.

Keywords


Concrete; Aggregate; Pre-cast; Waste treatment; Workability

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References


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