Influencia de la adición de la cal viva en concretos elaborados con agregados reciclados de concreto

Abstract

The present document analyses the performance of recycled concrete with the use of RCA by product of the crushing of RCD in concrete elements. The research is based on the replacement of 20%, 35% and 50% of the natural coarse aggregate with recycled coarse aggregate (RCA). Likewise, this research proposes the use of calcium oxide or quicklime, as a complementary material for the reduction of cement, which allows the reduction of permeability or porosity in recycled concrete mixtures, thus achieving an increase in durability compared to a control mix. Having said the above, a substitution of 2% and 5% of calcium oxide (CaO) as a cementitious material will be carried out to study the influence that this material has on concrete with recycled aggregates to later compare the results in the hardened state in reference to the resistance to compression, flexure and electrical resistivity for specimens in concrete cylinders and beams at different ages of evolution (7, 14, 28, 56, and 90 days). Finally, perform a qualitative analysis through SEM microscopy testing on three (3) particular concrete mixtures. “Mix #1; 0% RCA – 0% CaO”, “Mixture #9; 50% RCA – 0% CaO” & “Mixture #11; 50% RCA – 5% CaO”.