ABSTRACT
ABSTRACT: Babaei express-way, length of 16 kilometers with three lines in every direction, is located in the north of Tehran. Investigation showed that the state of pavement is unsuitable and it was damaged very widely. On the other hand, there were longitudinal and transverse cracking and mostly alligator crack on the pavement layer. Our observation showed that the state of the lower layers of asphalt was fundamentally unsuitable; also there was a large quantity of clay seen in these layers. Under these circumstances, all of the asphalt was milled and the lower layers were improved. Then the cold recycled asphalt with cement and foamed bitumen was replaced. This study, tries to state the executive approach and the results of operations. It is necessary to notice that we have used a new experiment in Iran for asphalt recycling in addition to lime stabilization of the soil layer for heavy rehabilitation of Babaei express-way.
