ABSTRACT
This experimental investigation involves testing and analysis of compressive strength, tensile strength, hoop and axial strains, and compressive load-deflection curves. A total of 31 specimens were examined to ascertain the varying properties of single-skin, double-skin, confined, unconfined, standard and rubberised concrete. Recycled rubber particles ranging from two to seven millimetres in size were used to replace 15% and 30% of the fine and coarse concrete aggregate by weight. The rubber particles were treated with sodium hydroxide solution resulting in increased bonding strength to the concrete. Circular Hollow Section (CHS) configurations of differing internal and external dimensions were also analysed to further understand the mechanics of double-skin confinement. Given the exceptional ductility, energy dissipation and improve strength of RuCFDST, this investigation shows the potential viability of RuCFDST as structural columns particularly in areas that are prone to seismic activity.
