Influence of the water variation on the mechanical properties of concrete manufactured with recycled mixed aggregates for pre-stressed components

Abstract This work aims to study the influence of water/cement ratio variation on some mechanical properties of concrete made with mixed recycled aggregate when it is used to prefabricate prestressed joists for flooring systems. All natural aggregate was replaced in volume by mixed recycled aggregate that means 50% recycled concrete aggregate and 50% recycled ceramic aggregate. Mixed recycled aggregate includes both, the fine and the coarse fraction. For the different mixtures considered in this research, the volume of water was modified while the mass of aggregates and cement were kept constant. After the curing period, different tests were carried out in order to obtain the most important mechanical properties of these concretes. The results showed a significant decrease of their properties due to the complete substitution of natural aggregates by the recycled material, and because of the water/cement ratio increase.

[1]  Marios Soutsos,et al.  The use of recycled demolition aggregate in precast concrete products – Phase III: Concrete pavement flags , 2012 .

[2]  Valeria Corinaldesi,et al.  Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates , 2010 .

[3]  S. Kou,et al.  Deformation properties and direct shear of medium strength concrete prepared with 100% recycled coarse aggregates , 2013 .

[4]  Marios Soutsos,et al.  Use of recycled demolition aggregate in precast products, phase II: Concrete paving blocks , 2011 .

[5]  J. de Brito,et al.  Mechanical properties of structural concrete with fine recycled ceramic aggregates , 2014 .

[6]  Tayfun Uygunoğlu,et al.  The effect of fly ash content and types of aggregates on the properties of pre-fabricated concrete interlocking blocks (PCIBs) , 2012 .

[7]  A W Beeby,et al.  CONCISE EUROCODE FOR THE DESIGN OF CONCRETE BUILDINGS. BASED ON BSI PUBLICATION DD ENV 1992-1-1: 1992. EUROCODE 2: DESIGN OF CONCRETE STRUCTURES. PART 1: GENERAL RULES AND RULES FOR BUILDINGS , 1993 .

[8]  Ksenija Janković,et al.  Concrete paving blocks and flags made with crushed brick as aggregate , 2012 .

[9]  E. Vázquez,et al.  Improvement of the durability of concrete with recycled aggregates in chloride exposed environment , 2014 .

[10]  P. Alaejos,et al.  Durability of recycled aggregate concrete , 2013 .

[11]  Qingyuan Wang,et al.  Use of wastes derived from earthquakes for the production of concrete masonry partition wall blocks. , 2011, Waste management.

[12]  Chi Sun Poon,et al.  Paving blocks made with recycled concrete aggregate and crushed clay brick , 2006 .

[13]  F. López Gayarre,et al.  Manufacture of concrete kerbs and floor blocks with recycled aggregate from C&DW , 2013 .

[14]  Rosemarie Haase.  Gesteinskörnungen für Beton und Mörtel - Teil 100: Rezyklierte Gesteinskörnungen , 2001 .

[15]  Witold Brostow,et al.  Combined effects of fly ash and waste ferrochromium on properties of concrete , 2012 .

[16]  E. Jiménez-Piqué,et al.  Study of the recycled aggregates nature's influence on the aggregate-cement paste interface and ITZ , 2014 .

[17]  Marios Soutsos,et al.  Concrete building blocks made with recycled demolition aggregate , 2011 .