Analisis Tebal Lapis Tambah Dan Umur Sisa Perkerasan Akibat Beban Berlebih Kendaraan (Studi Kasus Ruas Jalan Nasional Di Provinsi Sumatera Barat)

Abstract

Due to limited availability of vehicle load data, estimator often use standard load in order to calculate the pavement thickness and overlay course thickness. This certainly makes the calculation of pavement thickness and overlay course thickness become not accurate. Inaccurate calculation results less capability of the pavement to endure the traffic load, as of the pavement become damaged before it reach it life service as planned. The aim of this study is to calculate overlay course thickness of flexible pavement based on actual load, standard load and remaining life service. The standard load that has been used based on form letter (Surat Edaran) Directorate General of Perhubungan Darat, Department of Public Works No. 2, 2008. The actual load was obtained by vehicle load survey using Portable Weighter instrument. Overlay course thickness was calculated using Manual Design of Pavement No. 02/M/BM/2013. The study case was conducted on four road segments, those are Tanah Badantung – Kiliran Jao road, Batas Kota Padang – Kota Painan road, Batas Provinsi Riau – Payakumbuh road and Sicincin – Lubuk Alung road. The traffic load estimation shows that the actual traffic load is greater than standard load. This results the overlay course thickness based on actual load is greater than the overlay course thickness based on the standard load. The greater distinction is on Tanah Badantung – Kiliran Jao load, wherein the thickness of overlay course that results by actual load is 56.4% greater than the thickness of overlay course that results by standard load. The greater traffic load also results reduction on pavement life service. Due to overloading, life service of Tanah Badantung - Kiliran Jao road is reduces 56.8 % of 5 years life service (2 years and 10 months). Kata kunci: Overlay, Overload Vehicle, Remaining Life.