Concrete Placement and Curing

Aside from adequate surface preparation for bonded overlays, the placement and curing processes are similar to those of conventional concrete paving. As noted in previous sections, excess shrinkage and/or improper surface preparation can lead to debonding at the concrete-asphalt interface. Thus, placement of the thin concrete overlay requires care. For example, if the surface temperature of the existing pavement is particularly high (e.g., in excess of 120 °F [49 °C]), it is recommended to sprinkle the surface with water to cool, and then remove standing water using compressed air just ahead of the paver. In addition, thin bonded overlays should be placed when the difference in the mix temperature and the existing pavement is minimal.

Figure 4 shows the placement of a thin bonded overlay on a milled asphalt pavement in North Dakota.