Numerical Simulation of Partially Encased Composite Columns with Recycled Aggregate Concrete

Resumo

The construction industry is a significant generator of solid waste, and the use of recycled aggregate concrete (RAC) mitigates environmental impacts. However, its application in partially encased composite (PEC) columns remains poorly explored. This study aims to simulate the structural behavior of PEC columns with RAC, considering coarse aggregate replacement ratios of 0%, 30%, and 50%, to evaluate the impact on their load capacity and axial strain response. The ABAQUS® numerical model was calibrated through experimental results and subsequently extended to include an additional replacement ratio for comparative purposes. The results indicate that the reduction in the mechanical properties of the concrete, associated with the gradual increase in the replacement ratio, resulted in a drop in both the load capacity and stiffness of the elements. Nevertheless, the overall structural response of the PEC columns remained consistent. These findings demonstrate the potential of RAC, showing that partial replacement of natural aggregates with recycled aggregates at low and intermediate substitution ratios maintains satisfactory structural behavior.