Flexible Pavement Evaluation

SYNOPSIS

Flexible Pavement Evaluation of Tumkur to Koratagere Road(SH-33)

-A Case Study

Roopa H B#1*

, Meghana G E#2

, Hemanth J#3

,

#1 Under Graduate Student, [e-mail]

#2 Under Graduate Student, [e-mail]

#3 Assistant professor, Department of Civil Engineering, [e-mail]

Akshaya Institute of Technology, Tumkur, Karnataka

ABSTRACT

In a developing country like India, roads and road transportation play an important role in the economic growth of a country. Due to development of infrastructure many changes has to take place to the design standards of highways.

From road user’s point of view the road must be safe, comfortable and enable fast movement of the vehicle at reasonable vehicle operation

But weak pavements will exhibit signs of failure in the form of wide cracks, ruts, poor ride quality and deflection. Because of this reason there is a need to evaluate the structural and functional deterioration of the flexible pavement periodically. Deterioration of pavement can be attributed to various factors like traffic, environment, materials properties and pavement thickness. Stability of pavement depends on subgrade properties which affect the mechanical characteristics of pavement. These factors affect the performance of the pavement in a complex manner.

The study was conducted on one of the highly deteriorated road to evaluate the existing road condition in terms of PCI (Pavement Condition Index) and also to improve the various geometric aspects of the road. For the present study a selected road stretch of

Kortagere-madhugiri road (SH-33) has been considered. The study includes traffic volume survey, pavement condition survey, road inventory, using these survey data flexible pavement design has been done as per IRC guidelines and the aspect of pavement condition evaluation reinforces the need of rehabilitation for the studied road.

PROBLEM

5

1048 1053 1056 4472 8968 1602 2718 96 16 24889

SH-33

(day3)

1767 636 1698 1018 1029 1071 4651 8692 1544 2520 104 24 2475

3Table 3 represents the details of pavement condition survey. Using these data PCI value shall be computed. PCI is a numerical rating of the pavement surface condition that ranges from 0 to 100 with 0 being the worst possible condition and 100 being the best possible condition. From the analysis the PCI value has been computed i.e, 25 according to this the required rehabilitation.

PRACTICAL APPLICATION

The in-situ density of the existing sub grade soil has been found and it is found to be insufficient compare to the obtained laboratory compaction characteristics for the same soil.

As rehabilitation is required for the project road it is desirable to re-compact the existing soil to achieve higher densities to have a better performance of the road. According to the CBR values obtained for the same subgrade soil the flexible pavement has been redesigned as per

IRC guidelines to increase the crust thickness of the road.

SUMMARY

Based on PCI road is requires “Rehabilitation”, and the width of the road is found to be insufficient to cater the two way movement of heavy loaded commercial vehicles,