Old roads in need of strengthening have been stabilised using bitumen emulsion of foamed bitumen. The results have been compared with those from other strengthening methods. Such bituminous treatments can be performed by using mix-in-place techniques of plant mixes, either mobile or stationary installations. Results from several road tests are reported. The aims have been to study production techniques and mix design and to monitor long-term road performance. Also the results from materials investigations in the laboratory are reported, including mechanical properties, freeze-thaw resistance and moisture. It could be said that the choice of binder type and mix design must be based on proper testing of mechanical properties and especially the durability of the mixture. To achieve good results in practice, sufficient information about the road to be strengthened must also be available. Furthermore, the crew performing the work must be skilled and motivated. (A)
Abstract