Correlation analysis between International roughness index and pavement distresses :: Case study at national highway of Central Java Province Indonesia

ARUAN, Natalia Rahmawati, Ir. Djoko Murwono, M.Sc

2010 | Tesis | S2 Magister Sistem Teknik

Ministry of Public Works has two indicator of pavement performance. Those are International Roughness Index (IRI) and Surface Distress Index (SDI). IRI is collected by automatic device called Roughometer. SDI is obtained by visual inspection to crack area, crack width, pothole and rutting. The research was conducted in order to investigate the relationship between IRI and pavement distresses. There were many pavement distresses. The distresses focused on this research were the distresses that used by Ministry Of Public Works to develop SDI, i.e. Crack Area, Crack Width, Pothole and Rutting. The agency often used IRI and SDI as indicator to analyze the pavement condition. From the analysis were concluded that there was a strong relationship between IRI and SDI with Coefficient of Correlation 0,809 and R Square value 0,655. A model could be develop between IRI and SDI, i.e. Y = 2,183 + 0,109 X., where Y = IRI and X = SDI. When, the analyses were done simultaneously to all distresses, the Crack Width and Pothole significantly can be included into the model. The model is Y = 2.200 + 0,286 X1 + 0.113 X2 where Y = IRI ; X1 = Crack Width ; X1 = Pothole. However, when the analyses were done separately by each distress, it was only Pothole that significantly had a relation with IRI, with Coefficient of Correlation 0,760 and R Square 0,578. The model is Y = 3,507 + 0,095 X where Y = IRI and X = Pothole. The other distresses, i.e. Crack Area, Crack Width and Rutting, within the 95% confident level, were not believed having relations with IRI because their sig. value were more than the requirement (0,05).

Kata Kunci : International Roughness Index ( IRI), Surface Distress Index (SDI), Pavement Distress, Roughometer II, correlation analyses