ABSTRACT
Test sections have been carried out on three sites, in Linköping in 1985 and in 1989 and in Kristinehamn in 1986. Test variables are: asphalt concrete thickness, type of asphalt concrete including polymer modified binders, and presence of geogrids and geotextiles. Minor cracking and some damages exist, but the overall performance is promising. In the paper, the influences of the different variables on the cracking behaviour will be reported and discussed. Keywords: asphalt pavements, cement bound roadbases, field tests, reflective cracking
1 Introduction
Cement bound roadbases were introduced in Swedish test roads during the 1950s, see Hobeda [1]. A 7 km long road - the first major project of this kind - was constructed in V&rg&rda close to Goteborg in 1969. Three layers of asphalt with a total thickness of about 120 mm were placed on top of a 175 mm thick cement bound roadbase. Severe transverse cracking was, however, observed few years later. Water has penetrated into the unbound layers through the wide cracks. Frost heave was observed at the cracks. The damage progress is typical for the ultimate effects of reflective cracking, see, e.g., Foulkes [2].
