In-situ characterization of pavement materials stabilized with foamed asphalt and cement

Recycled material stabilized with foamed asphalt and cement was used as a base of a rehabilitated semi-rigid pavement of a heavily trafficked highway. Documentation concerning the in-situ characterization of foamed asphalt recycled material has been limited to low to medium volume roads. In order to investigate the in-situ performance of the aforementioned stabilized material, the Laboratory of Highway Engineering of the National Technical University of Athens (NTUA) undertook a field experiment. A comprehensive in-situ testing and data analysis research study was conducted on a trial section, incorporating non-destructive tests (NDTs), as well as laboratory tests on specimens and cores. Laboratory estimated stiffness of the foamed asphalt material proved not as sensitive to temperature changes, in comparison with dense-graded AC. According to the deflection analysis at different load levels, an indication of stress dependent behavior of the recycled material was observed along the outer wheel path. A significant difference between the mix design and related in-situ results was observed at the stage of the present analysis.