Abstract
The ability of a pavement structure in carrying out its function reduces in line with the increase of traffic load, especially if there are overloaded heavy vehicle passing through the road. This study was done to know the effect of overloading vehicles on the road pavement and remaining service life of the pavement. In this study, the service life of pavement due to overloaded vehicles was analyzed using the AASHTO 1993. In Narayanghat-Mugling road the composition of traffic seems to be 83.76% heavy vehicles, 9.18% medium vehicle and 7.05% light vehicle. For the direction of Narayanghat-Mugling, the pavement service life might be reduced by 59.90% due to overloading condition, while for the opposite direction, the service life would not reduced caused by the same factor. The impact of overload conditions on the road pavement showed premature failure; that is, a condition which the damage reduced the life of roads before the design life of the road is reached. From the results, it can be concluded that overloaded vehicles on the road are very influential to the reduction in pavement service life. Therefore, it is expected that road users to comply with existing regulations in the conduct of transportation. As overloading is increasing, it has to be controlled by rules and regulations with penalty to control the overloading. So fines must be associated with intensified enforcement when considered in further strategy. Regular monitoring, inspection and enforcement are the effective ways to control overloading. Use of technology (Automatic overloading information system) may be the effective way to control the overloading.
Highlights
Comparison between equivalent single Axle Loads (ESALs) with overloaded and standard truck traffic is the important factor to estimate the reduction in pavement service life, because pavement service life is directly driven by traffic load
The standard traffic load of Narayanghat-Muglingin 10 years is 34.20 million ESAL, but this number in overloaded condition is reached in 4.10 years
As per design report submitted by contractor in 2004, CESAL was taken as 22.22 million ESAL for the year 2014 for design
Summary
Design life of new flexible pavement is frequently taken as 5 to 15 years [1] which includes regular maintenance and rehabilitation within its service period. Comparison between ESAL with overloaded and standard truck traffic is the important factor to estimate the reduction in pavement service life, because pavement service life is directly driven by traffic load. Maintenance and Rehabilitation Cost Calculations of ESAL of overloaded truck traffic and pavement service life were the steps to work out the total Maintenance and Rehabilitation (M&R) cost over. The calculation of net present value (NPV) of investment to the pavement must be based on service life and M&R cost. The difference in NPV of pavement investment with and without overloaded truck traffic becomes the important indicator to determine the value of economic loss [5]
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