EVALUATING THE QUANTITATIVE INFLUENCE OF DIFFERENT CAUSES OF RAVELLING FOR IMPROVED MAINTENANCE STRATEGIES

摘要

Planning of pavement maintenance is often based on field measurements of the technicalrnpavement condition, including surface distress (cracks and ravelling). Its objective andrnaccurate quantification remains a challenge. This work, being a collaboration ofrngovernment, science and industry, reveals the causes of ravelling and provides arnquantitative measure of their relative importance.rnDevelopment of ravelling may be influenced by various factors. This contributionrnelucidates their relative importance by means of a statistical model. The model uses datarncollected within an extensive field study. We surveyed real pavement performance of 740rnlane kilometres of motorways in four European countries over one or two winters. Resultsrnindicate that ravelling development depends mainly on the overall wear type of thernpavement expressed by its age and the percentage of initially ravelled area. Moreover, inrnwinter porous asphalt ravels twice faster than asphalt concrete. Other factors, such as thernheavy traffic intensity or local structure and weather conditions have lower impact onrnravelling development.rnQuantitative results complement our physical and mechanical understanding of ravellingrndevelopment. We apply these insights to evaluate the influence of an innovative treatmentrnpreventing frost damage. An analysis based on pavement management system confirmsrneffectiveness of the novel treatment.