YOUNG’S MODULUS AND DEFLECTION ASSESSMENT ON PAVEMENT USING A LIGHTWEIGHT DEFLECTOMETER

Abstract

This research implemented direct assessment in the field on road structures using the Light
Weight Deflectometer (LWD) method. This method is similar to the Falling Weight Deflectometer (FWD)
method. The LWD method uses a lower loads compared to the FWD method. LWD method was chosen
because the equipment is quite portable and straightforward allowing it to be used directly in the field, making
inspection easier. The LWD method is more suitable for assessing the pavement conditions in which the
volume of road use is not too high. This study aims to determine the value of the road structure conditions
based on material properties. The location of the survey was Kupang City, East Nusa Tenggara, and Indonesia.
The number of test points is 77 main points, with each point consisting of several tests. The test results obtained
in this study are the value of deflection and modulus of elasticity at each test point. In addition, a radius of
curvature analysis was carried out to determine the base of the pavement structure conditions. LWD testing by
giving a load on the surface of the pavement was found to predict the base conditions of the road structure.
This study also analyzes the EFWD conversion value from the ELWD test results and the correlation between
these methods is presented.