Failures in Flexible Pavements and Remedial Measures

Abstract

The Purpose of this project is to improve the pavement of Highway in order to provide a satisfactory surface over which vehicles can operate effectively and safely. This project presents the classification on failures and its patterns. Firstly, failure patterns are classified between every five miles in existing pavement by visual inspection.  Secondly, Visual maintenance and structural maintenance are studied. For structural maintenance, stress and deflection of Highway are determined by using the method of Soil Mechanic of Three Layered System. The required overlay thickness is evaluated in accordance with Indian Road Congress formula. According to this evaluation, it is found that resurfacing or routine maintenance is needed in almost portions. Within the study area, it is needed to be overlaid in the four portions. The maximum bituminous overlay thickness is 6 in and minimum is 4.5 in. Moreover, the maximum granular overlay thickness is 12in and the minimum is 9. In India, flexible pavements with bituminous surfaces are widely used. Due to increased traffic intensity of roads, overloading of commercial vehicles and temperature variation of pavements due to climatic changes leads to formation of various distresses like rutting, shoving, bleeding, cracking the pavement.