EXPERIMENTAL STUDY ON MECHANICAL BEHAVIOUR OF REINFORCED RECYCLED COARSE AGGREGATE CONCRETE COLUMNS

In order to research the mechanical performers of reinforced recycled concrete compression columns，six reinforced recycled concrete columns were designed for axial and eccentric compression experiment． This experiment involved the replacement rate of recycled coarse aggregate，relative eccentricity and stirrup ratio etc． The whole destructive process and failure mode of reinforced recycled concrete columns were observed through the experiment． The cross-sectional stress distribution，deformation，ultimate bearing capacity and other important data were obtained． And the effecting law of each changing parameter on the recycled concrete columnsultimate bearing capacity was analyzed． The results showed that the axial，eccentric compression destructive process and failure mode of reinforced concrete columns were similar to those of ordinary reinforced concrete columns，both showed as crush of concrete． Influence on specimensultimate bearing capacity of relative eccentricity was evident，the ultimate bearing capacity of columns was decreasing with the increase of relative eccentricity，and the replacement rate of recycled coarse aggregate had little effect on the bearing capacity． When using the calculation methods of the ordinary reinforced concrete columns to calculate the reinforced recycled concrete columns， for axial compression strength， the experimental data were smaller than the theoretical data，which was not safe; for eccentric compression strength，the experimental data were bigger than the theoretical data．