Flexible Pavement Overlay Design Using Cumulative Difference Approach of Homogeneous Section
Prashant R. Pambhar
Student of Final year, M. Tech (Transportation System Engineering), B.V.M. Engineering College, Vallabh Vidyanagar, Gujarat, India , IN
Dr. L.B. Zala
Student of Final year, M. Tech (Transportation System Engineering), B.V.M. Engineering College, Vallabh Vidyanagar, Gujarat, India , IN
Amit A. Amin
Student of Final year, M. Tech (Transportation System Engineering), B.V.M. Engineering College, Vallabh Vidyanagar, Gujarat, India , IN
Keywords: Falling Weight Deflectometer, Structural Evaluation, Cumulative Difference Approach, KGPBACK Software, IITPAVE Software.
Abstract
The large amount of data commonly used to characterize the pavement surface and structural conditions. Road measured data become useful information only if treated in order to match each section with statistically meaningful values. While a large number of observations along the length of a road allow a better quantification of the expected value and variance of a parameter, basing a design on an average parameter along the project length will typically be uneconomical and less reliable. Therefore, pavement surface and structural condition data along a project length needs to be delineated into uniform sections. The main objectives of this paper are to analyse the FWD test results of flexible pavement (NH-8 starts from Kamrej 0.000 Km and ends at Chalthan 16.350 Km) and to forecast the pavement structural capacity and subsequent overlay design. Collected data comprises FWD deflection basin, test pit data and pavement condition survey, classified volume survey and weather data. Cumulative difference approach (CDA) for identification of homogeneous sections suggested in the AASHTO Guide for Design of Pavement Structures were incorporated to address delineate homogeneous sections, on the basis of surface curvature index. These surface deflections basins are later used to evaluate the structural capacity of the existing pavement. KGPBACK was used for back-calculation.
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