Structural behaviour of rubberized concrete column with steel fiber subjected to axial loading
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Date
2019-06
Authors
Tan Chia Shin
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Abstract
Waste tire rubber is always a major concern in the world and has created many
problems to the environment. Researchers have found out recycled rubber materials as
partial replacement of the aggregates inside the concrete mix and concrete mechanical
performances are assessed using methods recommended previously. Incorporation of
waste tire rubber will reduce the amount of waste tires into the landfill and also to cater
the issue on the depletion of raw materials. The effect of combination between crumb
rubber and steel fiber on the structural behavior of column was identified in this study.
Crumb rubber of size ranging from 1.15 to 2.36mm and smooth micro steel fibres of
diameter 0.2 mm and length 10 mm were used in the concrete mix. The rubber was
partially replacing the fine aggregates at percentage of 15% and steel fiber with volume
fraction of 0.5% was added into the mix. Four concrete mixes were prepared in this
study such as normal plain concrete (OPC), steel fiber reinforced concrete (SFRC),
rubberized concrete (RC) and rubberized steel fiber reinforced concrete (RSFRC).
Mechanical properties of each type concrete mix (compressive strength, tensile strength
and flexural strength) were assessed using respective methods. Results obtained
showed reduction of mechanical properties when replacing rubber materials into
concrete whereas addition of steel fiber enhanced the mechanical performance of
concrete. For the column experimental work, energy absorption capacity of column
was obtained by calculating area under load-deflection curve of each column. It was
found that interaction between crumb rubber and steel fiber will enhance energy
absorption capacity and ductility of concrete.