Abstract
This study investigates that the use of crumb rubber and recycled glass powder in the flexible pavement since the crumb rubber and recycled glass powder are seen everywhere for small functions to large ones. It remains unseen after the day it serves its purpose. It is decided to use this commonly wasted crumb rubber and recycled glass powder in our project provided to improve the strength of the pavement. The properties such as tenacity, elongation and melting point has been tested both the crumb rubber. Some replacement percentages have been carried out based on trial and error method. Six different mixes were proposed and the properties of those bituminous mixes were compared with conventional bituminous mixes. The various bitumen tests are to be carried out to define the properties of the proposed Bitumen. Marshall stability and flow value test also be carried out. From all these tests it is found out that the proposed bituminous mix can be used in hotter regions and here in the cost can be reduced based on the option exercised by the designer for reducing the thickness of an individual layer and it contributes to recirculation of plastic wastes as well as to protection of the environment.
1. INTRODUCTION
One of the major factors which determine the progress of a nation is the development in the transportation facility. India has the third largest road network in the world with the length of 4.32 million kilometers as per the census of 2011. The quantitative density of the road network in India is 0.66 km of road per square kilometers of land. The pavements can be broadly classified into two types i.e., Flexible pavement and rigid pavement. Flexible pavements are those which reflect the deformation of subgrade and the subsequent layers to the surface. The rigid characteristic of the pavement are associated with rigidity or flexural strength or slab action so the load is distributed over a wide area of subgrade soil. Rigid pavement is laid in slabs with reinforcement. The mostly adopted in India is flexible pavement.
6. CONCLUSION
Better results are obtained for an optimum replacement of 6% of crumb rubber by total weight and 6% of recycled glass fibre by total weight. Crumb rubber and recycled glass fibre has modified many properties of the bitumen and those parameters are as follows: (i) Specific gravity of the proposed bituminous mix equals the specific gravity of the normal conventional bitumen.
(ii) Penetration value has been reduced to 20 which means, the bitumen has been upgraded to A20 & S20 grade from A90 & S90 grade. It could resist greater impact and could offer more resistance against wearing.
(iii) From the softening point value it is evident that the bitumen has been upgraded from A90 & S90 grade to A35 & S35 grade. The softening point value has been drastically increased and this type of bitumen can be preferred in hotter regions where the temperature would be more than 45oC.
