Influence of recycled coarse aggregates characteristics on mechanical properties of structural concrete

Abstract

This work studies with the influence of recycled coarse aggregates features on the mechanical properties of structural concrete. Recycled concrete is characterised by replacing different percentages of natural coarse aggregate with recycled coarse aggregate (0, 20, 50 and 100%) and two different water-to-cement ratios .50 and .65. The experimental program was carried out at the two laboratories: one at the University of A Coruña and another at the Università Politecnica delle Marche (Italy). For said purpose, two different recycled aggregates were used, with different water absorptions and compositions. Results obtained allowed the authors to establish different mechanical behaviour of recycled concrete (compressive strength, tensile splitting strength and modulus of elasticity) due to different replacement percentages and characteristics of the recycled aggregates.

Keywords:

• recycled concrete
• compressive strength
• time-dependent compressive strength, tensile splitting
• modulus of elasticity

Acknowledgments

The study was funded by the following projects: “Clean, efficient and nice construction along its life cycle (CLEAM)” funded by the Centre for the Technology and Industrial Development (CDTI) and led by the Group of Economical Interest CLEAM-CENIT, AIE comprising by the country’s largest construction companies (Acciona, Dragados, Ferrovial, FCC, Isolux Corsán, OHL and Sacyr) and some PYME (Informática 68, Quilosa and Martínez Segovia y asociados). “HORREO: Robust self-compacting recycled concretes: rheology in fresh state and mechanical properties (BIA2014-58063-R)” funded by the Ministry of Economy and Competitiveness.