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Abstract
Most of the time, used tyre rubber is not noticed to be applied in a useful way. It is rather becoming a potential used and pollutant to the environment. Moreover, the collecting process of used tyres is not very costly as compared to the extraction or production of mineral aggregates used in normal concrete. The general objective of this study is to evaluate the hardened properties of the concrete produced by replacing part of the natural coarse aggregate with an aggregate produced from locally available used tyre rubber. With the i ncrease in urbanization in India, the number of cars and consequently the amount of used tyre is going to increase significantly in the near future. Hence, the no environmental nature of these used tyres is going to be a potential threat. This study concentrated on the performance of a single gradation of used tyres. The used tyres are collected from local sources and manually cut into pieces to achieve uniform size of 20 mm, which is the maximum aggregate size in the mix design. The influence of different gradations of the tyre aggregate on concrete properties was not evaluated in this study but it should be considered in future researches. All the used tyres collected were chosen from those collected to avoid any inconsistent properties that may arise by mixing materials from different sources. The properties of used tyres from other tyre manufacturers were not included in this study. The study was done on M20 concrete grade. The influence of using used tyres in high strength concrete was not covered in the present study. The percentage replacements were limited to 5 categories i.e. 10%, 20%, 30%, 40% and 50% replacement of the natural coarse aggregate. The different effects, which can be observed in different percentages of replacements.