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Browsing Conference Proceedings (VTTI) by Author "AECOM (Firm)"
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- Innovative Approach to Airfield Pavement Inspections and Distress Identification at Oakland International AirportKeegan, Katherine; Jung, Kenneth (2015-06-04)Visual collection of surface distresses on airfield pavement in support of pavement management is becoming increasingly challenging for airports. Operational constraints limit access time for inspections on high priority pavements, and reductions in funding and operational staff resources lead to constraints in access to visually inspect pavements. Airports are increasingly relying on contractors and consultants to provide their own escorts, driving up the cost of Airport Pavement Management System (APMS) program. The use of high speed imagery for airfield pavement management is not a new concept. It has historically been limited in its ability to provide accurate distress data used to determine the Pavement Condition Index (PCI) in accordance with Federal Aviation Administration (FAA) Advisory Circular 150/5380-6B. The limitations and challenges have ranged from poor image quality to difficulty referencing images to the pavement management segmentation and sample units. This paper will review a case study with the most current technology completed at Oakland International Airport in California, USA that discusses an innovative approach to data collection, analyses and processing techniques using geospatial methods. This allowed the airport to benefit from highly specialized data collection equipment that generally is used to collect data for large roadway networks one lane wide, such as State highway networks, and report basic crack data summarized by milepost. Airfields require distress data at a more detailed level and also need the data to be presented across full pavement widths which can exceed ten times the width of a data collection pass in the case of runways. The airport was able to realize the benefits of this approach by quick data collection that reduced the operational impact and necessary pavement closures; high quality 3-D imagery that is now maintained as a permanent record of condition and displayed and accessible on their in-house GIS (Port View); 100 percent distress coverage on key pavement features; and improved maintenance plans.
- The Use of Measured Pavement Performance Indicators and Traffic in Determining Optimum Maintenance Actions for a toll road in South Africa and Comparison with HDM-4 PredictionsWeidemann, Jurgens; Madsen-Leibold, Surita; Redivo, Stefano; Mkabela, Cebile (2015-06-04)The Bela-Bela/Polokwane toll road on National Route 1 was the first Build, Operate and Transfer (BOT) type contract in South Africa. Extensive data on the pavement performance and traffic loading was collected as part of a detailed monitoring program since the opening of the road in 1997. This data was used to determine cost-effective and optimal maintenance actions in order to reduce life cycle costs. This case study illustrates how the measurement of pavement performance indicators and traffic were used to effectively design the maintenance actions required over the life of the pavement. This paper also includes a comparison of the actual pavement performance data collected for this 156.43 km long toll road with the performance as predicted by HDM-4 pavement deterioration models. An objective of this paper is to evaluate the appropriateness of the HDM-4 models for the specific climatic and traffic loading conditions that this specific pavement was subjected to. A significant feature of the comparative study is that the data used was collected on project level using short road segments and relatively short time intervals.