Pavement Preservation with Micromilling in Georgia: Follow-Up Study

The micromilling technique to mill asphalt surface mix continues to be studied in the state of Georgia as part of a pavement preservation treatment in conjunction with thin asphalt overlays. Earlier research showed the results of micromilling on a deteriorated open-graded surface, which was overlaid with a new open-graded surface on I-75, south of Macon, Georgia. The micromilling produced a much finer surface texture than did conventional milling, with a ridge-to-valley depth (RVD) of less than 3 mm, and the technique could more accurately mill the deteriorated open-graded layer. A new open-graded surface was placed on top of that layer with no need for a new dense- or gap-graded layer. The result was a large cost savings compared with conventional milling and overlay. This paper summarizes research performed on a micromilling and open-graded inlay project on I-95 near Savannah, Georgia, and compares the results with those from the previous research. The new research affirms that significant cost savings ...