The Use of IRE^s LWD for Overlay Design of Flexible Pavement
Siegfried 1), F. Mulyawati 2), I. Sudarsono 3)

Institute of Road Engineering, Directorate General of Highways, Bandung 1)
Department of Civil Engineering, University of Langlang Buana, Bandung 2) 3)

Abstract

One activity of pavement management system is to design the overlay thickness need of a road link to accommodate design traffic. To do so the main data required is the surface deflection tested on the evaluated road links. Most of current design method suggest to use Falling Weight Deflectometer (FWD) as the standard testing equipment. Because of the limited number of FWD available in Indonesia, The Institute of Road Engineering (IRE) as the government research center in Indonesia carried out the research about the Light Weight Deflectometer (LWD) as an alternative equipment for FWD. The research was done in the fiscal year of 2012 - 2014 and performed a prototype called IRE^s LWD. To conform the suitability of the use of LWD on overlay design some other research has also been done by comparing the results of overlay design by using this two equipment. The research is done by taking 3 location in indoor road trial section of Alusan laboratory using FWD and IRE^s LWD successively. The deflection data is then used to design overlay for 5 million CESA. The results found that the difference between each other is below 10% in thickness. This finding brings to the conclusion that the use of IRE^s LWD for design overlay thickness of flexible pavement is acceptable especially for the road links classified as medium to low traffic.

Keywords: Overlay design, IRE^s LWD, FWD

Topic: Engineering