Experimental Study of Design Parameters of Structural Layer on Flexible Pavement Using Crumb Rubber Modified Bitumen

The utilization of Crumb Rubber i.e. the rubber obtained from the waste tires of vehicles in the construction of flexible pavement is gaining importance day by day. It is also significance mentioning that, the modifier raw-material has been sourced from disposed crumb rubber. This not only allows us to collect modifier raw material at very low cost, but also provides a solution towards ecological menace posed by increased use of rubber. In the present study, an attempt has been made to use Crumb Rubber, blended using wet process. Marshal method of Bituminous mix design was carried out for varying percentages i.e. 8%, 10%, 12% and 14% of Crumb Rubber to determine the different mix design characteristics. The Dense Bituminous Macadam (DBM) mix was prepared using Marshall Method of bituminous mix design. The DBM was prepared with conventional VG-30 grade bitumen, VG10 grade bitumen added with varying percentages of Crumb Rubber. Marshall’s mix design was carried out by changing the modified bitumen content at constant optimum rubber content and subsequent tests have been performed to determine the different mix design characteristics and for conventional bitumen (VG-30). This has resulted in much improved characteristics when compared with straight run bitumen and improve the strength of the pavement Modified Bitumen is one of the important construction materials for construction of flexible pavements.