THE COMPARISON OF COMPRESSIVE & FLEXURAL STRENGTH BETWEEN PLAIN CONCRETE AND THE CONCRETE WITH PARTIAL REPLACEMENT OF TYRE RUBBER, MARBLE FINES AND FLY ASH

civil engineering

The aim of this project is to replace raw materials of concrete with waste from industries like Fly ash, Marble chunks and scrap tyre rubber. Around 163.56 million tones Fly ash, 7 million tones marble waste and 90,000 metric tones waste tyre generated every year in India. The degradation of this waste is very long process and hence project is helpful in reducing and recycling the waste. In this project we have partially replaced Fly ash with cement, Marble waste with sand and waste tyre rubber with coarse aggregate. With proper mix design cubes were casted and tested. It was determined that possibility of usage of these waste in the concrete as aggregate affected positively on the hardened properties of concrete. Green concrete is cost effective and environmentally friendly. River sand has been the most popular choice for the fine aggregate component of concrete in the past, but overuse of the material has led to environmental concerns, the depleting of securable river sand deposits and a concomitant price increase in the material. Therefore, it is desirable to obtain cheap, environmentally friendly substitutes for cement and river sand that are preferably by-products. Fly ash (pulverized fuel ash) is used extensively as a partial replacement of cement. However, though the inclusion of fly ash in concrete gives many benefits, such inclusion causes a significant reduction in early strength due to the relatively slow hydration of fly ash. Never the less, fly ash causes an increase in workability of concrete. It has been a growing practice among the researchers to use the deformed shapes of rubber tyres while incorporating into the concrete mixture. The rubber tyres shows better performance in concrete when they are cut in the form of normally sized coarse aggregate to take the full advantage of the shape factor of the aggregate. Due to this fact, the compressive strength of the concrete can be made more or less stronger as compared to the aggregate sizes which are not in the proper shape to be incorporated in the concrete.

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