What is an effective means for preventing reflective cracks in thin unbonded overlays?
The American Concrete Pavement Association indicates that bituminous-based materials provide the best results as an interlayer material. The mix should meet standard design specifications and should employ conventionally graded aggregates. The maximum aggregate size should be about half the minimum thickness of the separation course. ACPA suggests 1 inch as a generally adequate thickness for a bituminous separation layer.