Specifications include, but are not limited to: Asphalt surface treatments shall be designed so the proposed materials are of sufficient quality and have the desired properties to provide the expected performance. Proper design also ensures the proper application rates are being used. The design procedure presented herein is a modified version of the McLeod design procedure (McLeod 1969, Janisch and Gaillard 1998). The procedure is based on two basic principles: • The aggregate application rate is designed to provide an asphalt surface treatment that is one stone thick (i.e., there should be a single layer of uniformly sized chips) with minimal excess. • The voids in the aggregate are designed to be 70% filled with asphalt cement for good performance (i.e., the chips should be 70% embedded).
