Study on Crumb Rubber Modified Porous Bitumen Pavement

Abstract

Pavement which allows water to percolate from its surface is called porous/pervious pavement. These type of pavements can be use in those areas where there is no proper drainage system. The water percolate through the porous pavement. We can use this type of pavement at residential area roads, parking areas and areas with low traffic This project involves discovering how the addition of additives in plain bitumen VG40 grade affects its properties. The properties include overall Strength of the pavement, softening point ,viscosity , ductility , penetration values of the modified bitumen. The goal of the project is to show that the addition of additives in plain bitumen significantly improves its properties and can be used in casting porous bitumen pavement. This has been done by performing numerous experiments and casting marshall mix design of the pavement. The additive used were crumb rubber which is obtained from tires. Upon experimenting on these , we have found that porosity ,Ductility Softening point as well as strength, i.e Compressive strength has improved significantly. We can thus conclude that Crumb rubber modified bitumen increase the adhesive force between the aggregates and bitumen and keep the aggregates attached to each other and impart impact resistance to Crumb rubber modified porous bitumen pavement. The softening point of the bitumen changes from 48℃ to 60℃ and Ductility reduced upto 25% and these characteristics in turn improve the porosity and strength properties of the Crumb rubber modified bitumen porous pavement.