Abstract: Replacement of natural aggregates with rubber tyre aggregates is an alternative way to dispose of waste tyre safely. Research has found that using rubber in concrete will enhance and reduce its density. This study considers how to minimize the loss of strength of concrete using rubber tyre crumb aggregates. In the recent research study rubber modified concrete was made by two different ways: 1) by replacing natural fine aggregate in normal concrete of M35 grade with untreated crumb waste tyre particles and 2) by replacing natural fine aggregate in normal concrete of M35 grade with crumb rubber particles treated with synthetic resin (PVA). The replacement of fine aggregates in both the cases was done at 5% ,10% and 15%.the rubber reduced the density and compressive strength of concrete while increased the flexural strength, water absorption and damping ratio. The size of crumb rubber varies from 4.75 mm to 0.15 mm. rubberized concrete recommended to be used in circumstances where vibration damping was required such as in bridge construction. Waste rubber tyres can be incorporated in concrete either as coarse aggregates or fine aggregates. Waste rubber aggregates have been categorized in to four types based upon their particle size. Crumb waste rubber is a material derived by reducing/shredding scrap tires or other rubber into uniform granules. The source of scrap tyres are: passenger car tires, truck tires and off-the-road tires. On average, about 10 to 12 pounds of waste crumb rubber can be manufactured from one passenger tire. Realizing the problem of strength reduction on the addition of tyre particles in concrete appropriate measures are needed  in order to improve the strength of rubber modified concrete.

Keyword: Crumb Rubber, Cement, Concrete, Fine Aggregate, Coarse Aggregate

| DOI: 10.17148/IARJSET.2020.7114