Investigation Of The Use Of Steel Fibers Extracted From Used Tyres For Reinforced Concrete Beams Under Cyclic Loading

Reinforced concrete (RC) beams under cyclic loading usually suffer from reducedrnaggregate interlock and eventually weakened concrete compression zone due to severerncracking and the brittle nature of compressive failure. On the other hand, the addition ofrnsteel fibers with conventional steel reinforcements can reduce and delay cracking andrnalso increase shear capacity and the ductility of RC beams. In this thesis shear strengthrntest of nine beams were conducted experimentally and analytically; seven beams withrndifferent steel fiber volume and shear spacing and two as control specimen. The variablesrnwere shear spacing, volume of steel fiber and type of loading. Steel fibers, which werernextracted from used tyre, each with a length-to-diameter ratio equal to 63.158 werernadded to the steel fiber reinforced concrete (SFRC) beams. Accompanying, compression,rnand splitting tests were also carried out to evaluate the compressive and tensile splittingrnstrength of the used fibrous concrete mixtures. Test results indicated that the controlrnspecimen demonstrated shear diagonal cracking failing in a brittle manner, whereas forrnthe SFRC beamsafter the diagonal crack appeared, the steel fiber reduces and delayrndiagonal crack width. The SFRC beam with 1% steel fibers and its shear spacingrnincreased by 50% exhibited an improved cyclic response, achieving a pronounced shearrnbehavior with significant strength.

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