Expected service life of wearing courses

As part of its 2012 to 2015 strategic plan the World Road Association (PIARC) determined the need to identify and review approaches taken in assessing the service life of wearing courses. This report reviews the different approaches taken by road authorities to determine the service life of wearing courses. The aim is to understand why they are replaced and identify the factors that affect decision-making. The service life of a wearing course depends on several factors such as the type of wearing [...]

State of the art in monitoring road condition and road/vehicle interaction

This report summarises the current state of the art regarding the collection of road condition and road/vehicle interaction data, providing an overview of current practice and emerging technologies. Technologies in the development and experimental stages are generally not discussed. The document is intended to concisely inform the reader of the range of technologies available, and not to replicate the considerable detail that is available elsewhere for specific technologies. Each of the commonly [...]

Monitoring of innovation in road pavements

This report examines road administrations and agencies policies for fostering, assessing and implementing innovation in road design and construction. From an international survey, eight types of innovation policies were identified: adaptation of existing specifications; agency led innovation, special organization processes; technical agreements and certification programs; value engineering proposals by contractors before and after contract bid; end-performance and long-term warranty contracts; [...]

Maintenance methods and strategies

This report presents the results of the answers from 16 countries to a survey regarding improved maintenance methods for flexible and semi-rigid pavements and the maintenance strategies. Regarding improved maintenance methods, the variations in the answers were found to be large. It also became clear that the knowledge about the long-term performance of different maintenance methods varies. It is not always clear whether the durability is an "expected" durability or an "achieved" durability. Some [...]

Guide for maintenance of concrete roads

The report firstly examines the different types of degradations of concrete pavements distinguishing those which are specific to jointed plain concrete pavements and those which relate to continuously reinforced concrete pavements. For each type of degradation, status indicator, status assessment, causes and remedial measures are presented. The report then describes the maintenance techniques providing precise indications on the products to use and the repair method. Three appendices complete [...]