Authors: M.Fakhri, Reza Shahni Dezfoulian
Abstract:Since the road construction cost is significant, it is considered as a national asset, the preservation and maintenance of which is a necessity. In other words, pavement maintenance programming and prioritization are considered as main goal in road agencies. Maintenance activities affect work scheduling and resource allocation. Their prioritization, which depends on various factors like pavement conditions, traffic volume, environmental effects, performance standards and financial constraints, is a necessity for the optimal use of the resources and selection of the better choices. Factors such as the significant cost of data collection, the lack of long-term pavement performance data (complete and reliable) and the lack of developed and calibrated pavement deterioration models, which are suited to the conditions of a country, are important reasons that can affect the implementation of pavement management system and the selection of a treatment prioritization model for pavement sections. In the absence of these main needs, the implementation of pavement management system will be difficult to justify. In this case, providing a simple method, which is commensurate with this status, can be used as a short-term (1 year) management decisions for pavement maintenance management. This paper, Based on expert opinion, develops a short-term maintenance management approach considering the treatment-based method (a first generation prioritization method) wherein prioritization is based mainly on the type of treatment and traffic range; in fact, maintenance activities hierarchy and road type are the bases for prioritization. While doing a general evaluation of the surface distress, in this paper, treatment cost and the importance of road performance and communication role (connectivity), “road type” (wide main road, ordinary main roads, freeway and expressway), which has been combined with the traffic range, have been considered in 2 scenarios (with and without budget limitation) to develop the method as a new approach; furthermore, crack sealing, patching, and thin overlay have been chosen as maintenance activities. To check the results of the proposed method, the surface distress of flexible pavements in Ilam province, Iran, were investigated in 2013 through rapid visual evaluations, also GIS software, as a practical tool, has been used to display pavement section distress and the result of prioritization.
Keywords: Asphalt Pavements; Maintenance; Prioritization; Simplified Methods; Iran.