Investigation of The Use of Steel Fibers Extracted from Used Tyres for Reinforced Concrete Beams Under Cyclic Loading
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Date
2020-06
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Addis Ababa University
Abstract
Reinforced concrete (RC) beams under cyclic loading usually suffer from reduced
aggregate interlock and eventually weakened concrete compression zone due to severe
cracking and the brittle nature of compressive failure. On the other hand, the addition of
steel fibers with conventional steel reinforcements can reduce and delay cracking and
also increase shear capacity and the ductility of RC beams. In this thesis shear strength
test of nine beams were conducted experimentally and analytically; seven beams with
different steel fiber volume and shear spacing and two as control specimen. The variables
were shear spacing, volume of steel fiber and type of loading. Steel fibers, which were
extracted from used tyre, each with a length-to-diameter ratio equal to 63.158 were
added to the steel fiber reinforced concrete (SFRC) beams. Accompanying, compression,
and splitting tests were also carried out to evaluate the compressive and tensile splitting
strength of the used fibrous concrete mixtures. Test results indicated that the control
specimen demonstrated shear diagonal cracking failing in a brittle manner, whereas for
the SFRC beamsafter the diagonal crack appeared, the steel fiber reduces and delay
diagonal crack width. The SFRC beam with 1% steel fibers and its shear spacing
increased by 50% exhibited an improved cyclic response, achieving a pronounced shear
behavior with significant strength.
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Keywords
Reinforced Concrete Beams, Cyclic Loading, Steel Fibers