Whitetoppings – Long Term Performance and Recommendations

Field tests have been carried out with thin, high strength concrete overlays (whitetoppings) placed on top of the milled asphalt pavement The aim is to find methods to restore rutted asphalt pavements and iliclease their rutting resistance. The whitetopping was limited to 70 mm. Both plain and steel fibre reinforced concrete have been studied. Two different joint spacings have been investigated: 1.25 and 3.5 m. Also a test section with an overlay consisting of open asphalt filled with high strength cementitious mortar has been included in the investigation. Aftcr more than four years in service, the test section performance is satisfactory. Besides test results, the paper provides recommendation for the construction of whitetoppings and suggests needs for further research.