EXPERIMENTAL INVESTIGATION OF SOME MECHANICAL PROPERTIES OF RUBBERIZED CONCRETE WITH HIGHEST POSSIBLE RUBBER CONTENT
Each year more than a billion tires are discarded globally, millions of them are disposed to landfills
especially in the developing countries which leads to serious environmental issues. This paper
experimentally investigates mechanical properties of concrete containing highest possible ratio of recycled
tire rubber content as fine aggregate replacement in terms of compressive strength, workability, dry and
fresh densities. For this purpose, eleven different concrete mixes were cast with various sand replacement
ratios by mass from 0% to 60% with increments of 6%. Three cubic specimens from each mix were cast
and tested to measure the mechanical properties at the age of 28 days. All the specimens had the
water-cement ratio and curing period without using any admixtures. It is concluded that the workability,
density, and compressive strength of the rubberized concrete samples are significantly reduced with an
increase of the rubber content. Moreover, it is observed that the mix becomes stiff and non-workable
beyond 60% of rubber content. Furthermore, the test results are compared with non-rubberized concrete
(control mix) and the available data on rubberized concrete from the literature. Finally, equations for
predicting the aforementioned properties are derived.
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