STRENGTH CHARACTERISTICS OF RUBBER DERIVED CONCRETE (RUBCRETE)

Abstract
About 2 million waste tires were generated in Kenya in 2012. This amount increases every
year and an estimate of 2015 will be about 5 million waste tires.
Weight, compressive and tensile strengths of concrete with rubber tires as coarse aggregates
were investigated. Fifty four concrete (150x150x150) mm cubes and thirty six concrete
(150x300) mm cylinders were prepared for this study. The replacement of aggregates with
cut tires was partially in the concrete mixes according to the mix designs required in terms of
weight. Test Results indicated clear substantial reduction in strengths and weight of the tire
derived concrete as compared with the strengths of controls. Based on the results of tests, tire
derived concrete was still not recommended for structural uses because of the low unit
weight, compressive and tensile strengths comparing with the normal concrete containing
natural rock aggregates.
The study also tried to point out the fact that not all discarded materials classified are wastes
but can be converted to other uses by manipulating. Adding them as partial substitutes for
coarse aggregate in concrete mixes, cut rubber tire pellets could lower cost of production and
saving valuable funds, protect the environment and resources to be used for construction
projects.

 

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