Experimental Study on the Confinement of Short Reinforced Concrete Columns Using Waste Tyre Tube as Internal Confinement Material

This study examined the use of waste tyre tube as an internal confinement material for short reinforced concrete columns under axial compression. Based on the experimental results, the following conclusions are drawn: 1.  Internal confinement using waste tyre tube strips improves the axial load carrying capacity of short RC columns. Single-layer confinement gave an average increase of 8.95 percent, and double-layer confinement gave 11.80 percent, compared to unconfined control columns. 2.  Confined columns showed more gradual, ductile-type failure with reduced spalling, compared to the sudden brittle failure observed in unconfined columns. 3.  Double-layer confinement performed better than single-layer confinement in terms of both strength and observed ductility, confirming that the degree of confinement has a direct effect on column performance. 4.  Waste tyre tube is a low-cost, locally available and eco-friendly confinement material. Its use also helps in reducing the environmental burden caused by tyre waste disposal. 5.  The technique is simple to apply, requiring no special tools or skilled labour, which makes it a practical option for low-cost and small-scale construction.

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