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Comparative Design of Flexible Pavement Using Different Countries’ Methodologies


Author(s):

B V Jogarao , MVGR COLLEGE OF ENGINEERING; S. Murali Sagar Varma, MVGR COLLEGE OF ENGINEERING; W. Sai Deepak, MVGR COLLEGE OF ENGINEERING; A. Vara Prasad, MVGR COLLEGE OF ENGINEERING; Kalyan A.V.S, MVGR COLLEGE OF ENGINEERING

Keywords:

AustRoads, AASHTO, DMRB, IRC-37, pavement structure, comparative design

Abstract:

AASHO road test conducted by American Association of State Highway and Transportation Officials in the late 1950’s is the first systematically conducted test data on pavement performance with different pavement layer compositions and different axle load repetitions. Based on AASHO road test results AASHTO-1961 was released with empirical design formulae for pavement structural design for both flexible and rigid pavements which was subsequently updated and released in 1972 and 1993. For many years this remained the source/ inspiration for majority of the pavement design manuals across the world, until the recent times when most of these codes/manuals were updated and rewritten to suit the weather, axle load composition and performance characteristics of pavements in respective countries. Indian Roads Congress’s code IRC-37 for design of flexible pavements was based on AASHTO. In this project an attempt has been made to study the differences / variations in the pavement layer thicknesses as designed from IRC-37 and AASHTO-1993. To make the comparisons useful in assessing the level of up-gradation of IRC, pavement designs were made with design codes of AUSTROADS (Australia) and DMRB (UK). Pavement structures were designed for 4 different sub-grade CBR values and 5 different expected traffic loadings (in MSA) using IRC-37. Keeping the Base and sub-base thicknesses same as obtained in IRC-37, top layer thicknesses were designed using AASHTO-1993, AUSTROADS-2010 and DMRB-2006 and these values were compared to see how much economical our IRC design is. It is observed that IRC designs were very much optimized and updated that in most cases IRC gave most economical section compared to AASHTO-1993, and these designs were very close to those given by AUSTROADS and DMRB too showing the level of upgradation of IRC-37 based on research and field performance studies.


Other Details:

Manuscript Id :IJSTEV2I7114
Published in :Volume : 2, Issue : 7
Publication Date: 01/02/2016
Page(s): 165-168
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