Mechanical Behavior of Recycled Aggregate Concrete under Uniaxial Loading-Unloading Cycles

摘要

The paper presents the results of an experimental program related with the damage behavior of Recycled Aggregate Concrete (RAC) under uniaxial loading-unloading cycles. To this purpose, the effect of the percentage of recycled aggregates (RA) on the compressive mechanical properties of concrete was investigated. Eight mixes with C25/30 and C35/45 target class of compressive strength were prepared using normal or recycled coarse aggregates. For both series, a target S4 class of workability has been chosen. Cylindrical specimens were fabricated with different RCA replacement percentages of 0%, 30%, 100% fine and coarse RA and 100% of coarse RA. Uniaxial loading-unloading compression tests were performed using controlled displacement rate of 0.5 mm/min. From the obtained stress-strain curves, the scalar damage is quantified as the variation of the elastic modulus. Based on the experimental results, it was found that the damage depends on the replacement percentage of recycled aggregates and increases when the replacement ratio is high.