Performance Study on Asphalt Pavement Preservation Technologies in Gansu Province
Pavement preservation majorly includes preventive maintenance, routine maintenance, and minor rehabilitation. Pavement preservation has many benefits when utilized correctly including life extension of the existing pavement, low treatment costs, reduced user costs, improved safety and overall network health, etc. A strong preservation program is essential to asset management because it is more cost effective to address minor distresses early, before the defects become major costly problems. Pavement preservation consists of many different kinds of treatments; however, each location has its suitable treatments, particularly in those complex climate environment. Gansu province has various geological and climate conditions, which create challenges to pavement engineering. To find the suitable pavement preservation treatments, a series of pilot testing sections using various pavement preservation technologies have been set up for a long-term pavement performance (LTPP) study. This comprehensive study involves four climate regions (Hexi desert region, Longnan rainy regions, Gannan alpine region and Longdong loess region), six types of general observation sections (Asphalt Concrete, SUPERPAVE, Asphalt Treat Base and so on), and five types of special preservation sections (SPS) (micro-surfacing, cape seal, ultrathin overlay, rubberized asphalt, and Stone mastic asphalt mixture). These test sections are used to help treatment design, strategy selection, and long-term performance modeling of pavement preservation treatments. For the test sections, pavement performance measures, such as pavement distresses, pavement condition index (PCI), Rutting Depth Index (RDI), are observed quarterly each year. To further support the analysis, weather stations have been established to collect temperatures and humidity information for pavements. The collected data are used to determine the influence of different maintenance technologies on pavement performance. The current study results have shown that pavements are more susceptible to crack and rut in the Hexi large temperature variation areas, and the cape seal technology and rubberized asphalt overlay are more suitable for retarding reflective cracking.
KeywordsPavement preservation Maintenance technology Long term pavement performance Pavement condition
This study was a part of the project funded by the Administrator of Gansu Transportation.
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