ABSTRACT
This study explored experimentally the use of rubberised concrete filled double skin tubes as possible alternatives in the construction industry such as security bollards and flexible road side barriers. The experimental investigation included changing the confinement of the outer and inner square hollow sections and exploring how confinement affected normal concrete compared to rubberised concrete. Four variations of double skin steel tubes with a total of twelve 300 mm columns of 0%, 15%, and 30% rubber replacement were created and tested concentrically. One single skin 300 mm long column with 0%, 15%, and 30% rubber variation was also tested and related to previous research. The compressive strength was measured experimentally, the strains of the outer steel reinforcement were measured and the failure mechanisms were noted. An interesting spring back phenomenon occurred where the infill rubberised concrete moved upwards after testing due to the large confinement of the core.
