Flexural behaviour of rubberized Concrete compared to normal Reinforced concrete rectangular beam
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Date
2018-06
Authors
Susanna Liow Soo Yee
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Abstract
Due to the health and environmental issue associated with the waste tyre
disposal and problem of the natural resources depletion, the effort of incorporating
waste tyre rubber particles bring twofold benefits. Most of the researchers investigated
the effect of rubber content and the rubber sizes on concrete properties at material level
but limited studies carried out to determine the rubberized concrete behaviours at
structural level. In this study, two types of tyre rubber, crumb rubber (CR) (1.15-
2.36mm) and ground rubber (GR) (0.177mm) and a combination of both are used to
replace 20% fine aggregate by volume in concrete. Four reinforced beam specimens
including controlled specimens were prepared with the same reinforcement
configuration and tested under four point bending test to compare their ultimate
flexural strength, deflection at peak load and their cracking pattern. The mechanical
properties of the rubberized concrete such as compressive strength and splitting tensile
strength were also examined. For the compressive strength and splitting tensile
strength test results, both possessed similar trend at which the rubber particle size is
inversely proportional to their reduction rate. This means that the concrete mix with
small rubber particles experienced a greater loss in strength compare to those with
larger rubber particles. The results also indicated that although the ultimate flexural
capacity of the beams decreased with the incorporation of rubber particles, the
deflection of the beam improved with the inclusion of tyre rubber aggregate. At
constant sand volume replacement, reinforced beam contained smaller rubber particles
exhibited higher ultimate flexural capacity and achieved a higher maximum deflection
at midspan of beam before failure. The beams exhibited almost similar ultimate
flexural capacity since this property is governed by the yielding of tensile
reinforcement and less influence by the compressive strength.