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THE USE OF RECYCLED RUBBER TIRES AS A PARTIAL REPLACEMENT FOR COARSE AGGREGATES
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THE USE OF RECYCLED RUBBER TIRES AS A PARTIAL REPLACEMENT FOR COARSE
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1. INTRODUCTION
1.1 Background of the Study

Cement and aggregate, which are the most important constituents used in concrete
production, are the vital materials needed for the construction industry. This inevitably led to
a continuous and increasing demand of natural materials used for their production. Parallel to
the need for the utilization of the natural resources emerges a growing concern for protecting
the environment and a need to preserve natural resources, such as aggregate, by using
alternative materials that are either recycled or discarded as a waste

Scope of the study

1) This study concentrated on the performance of a single gradation of crumb rubber. The
waste tires are collected from local sources and manually cut into pieces to achieve a
uniform size of 20 mm, which is the maximum aggregate size in the mix design.

2) The influence of different gradations of the rubber aggregate on concrete properties was
not evaluated in this study but it should be considered in future researches.

3) All the waste tires collected were chosen from those manufactured by Matador Addis Tire
S.Co to avoid any inconsistent properties that may arise by mixing materials from
different sources. The properties of waste tires from other tire manufacturers were not
included in this study.

Methodology of the study
The different methods utilized in this research include the following:

i) Background study
Literature survey was carried out to review previous studies related to this thesis.

ii) Collection of raw Materials
All the required materials were collected and delivered to the laboratory. These are;
Cement, fine aggregate, coarse aggregate, used rubber tires and admixture.

ii) Material Tests
Tests were conducted on the raw materials to determine their properties and suitability
for the experiment.
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