Asphalt and Cement-Treated Open-Graded Drainage Layer

Asphalt and cement-treated open-graded drainage layers are produced at asphalt or concrete plants and laid using an asphalt or concrete spreader. For best results, the following should be applied:

• Proper mixture design is essential to ensure the optimum asphalt or cement content for the chosen aggregate gradation.
• The finished surface should be within ± ¼inch of the design profile grade.