Abstract :
Evaluating existing flexible pavement condition is a pre-requisite to choose improvement technique that has to
be adopted to enhance its quality. To evaluate existing pavements, non-destructive testing methods are desirable.
Benkelman Beam and 5th Wheel Bump Integrator are used to conduct non-destructive tests like deflection and
roughness surveys on the existing pavement of 4 lane divided carriageway of Nandigama – Ibrahimpatnam section of
NH-9 in the state of Andhra Pradesh (India). In this paper, an attempt has been made to develop and validate linear and
logarithmic models between deflection and unevenness index for pavement under study and the correlation between
these two parameters. The section selected for model validation is Naidupet – Sullurpet section of NH-5 in the state of
Andhra Pradesh. It is found that validated unevenness index (UI) values from the model are 90% similar with the UI
values obtained from roughness survey at second location. Conducting deflection and roughness surveys cost around
. 2,00,000 per Km and is time consuming. The objective of the study is to develop a relation between deflection and
unevenness index, such that, if one parameter is known, the second parameter can be calculated and hence, the survey
time and cost can be minimized.
