A REVIEW PAPER ON THE AXIAL BEHAVIOUR OF CONCRETE FILLED STEEL TUBES CONTAINING HIGH VOLUME WASTE TYRE RUBBER CONCRETE.

Abstract

One of the solution to reduce tire waste is by incorporating rubber as ne aggregate replacement, producing a rubberized concrete. This type of concrete generally has lower compressive strength, however, could potentially be used as structural application due to its inherent ductility. Crumb rubber concrete, in which a portion of the mineral aggregates in concrete is replaced by the waste tire rubber, has attracted great research attention as a sustainable building material. It is a promising solution to the over-exploitation of river sand and the recycling of waste tire rubber. However, the concrete strength decreases signicantly when crumb rubbers were used to replace the ne mineral aggregates. A reliable strength reduction model for the crumb rubber concrete with ordinary strength is essential for its practical use in engineering structures. With different volume replacement ratios of rubber ne aggregate and thicknesses of steel tube, 12 rubberized concrete- lled steel tube (RuCFST) columns were fabricated. Then axial compressive tests were completed. The test results show that RuCFST columns exhibit lower axial compressive capacity and higher ductility than normal CFST columns. The steel tube of the RuCFST with a high rubber replacement ratio is more prone to local buckling and the axial load-displacement curves of RuCFST columns tends to exhibit hardening post- peak response. Based on the experimental results, the relationship between the critical value of the connement coefcient and the rubber replacement ratio of RuCFST columns was obtained.