Materials. (a) Class 7 Base. Materials for aggregate base course shall meet the requirements of the ARDOT Standard Specifications (2014) Section 303 for Class 7. (b) Rip Rap Limestone. Stone for riprap shall be from an approved source and shall consist of a durable material with a percent of wear not greater than 45 by the Los Angeles Abrasion Test (AASHTO T96). Riprap stone shall have angular or fractured faces and shall not weigh less than 140 pounds per cubic foot. Riprap stone shall be well graded to produce a minimum of voids. The maximum size of each piece shall be no greater than 12” in any dimension, and approximately 50% of material shall consist of pieces weighing 35 pounds or more. (c) Shot Rock. Material for Shot Rock shall include stone obtained from an approved source and shall consist of hard and durable limestone. The stone shall be greater than 1 ½” and less than 30” graded and angular, with fractured faces on at least 75% of the surface and shall not contain more than 10% overburden or fines less than 1 ½” in maximum cross-section. The stone shall weigh not less than 150 pounds per solid cubic foot and shall have a percent of wear not greater than 45 by Los Angeles Test (AASHTO T96). (d) Concrete Aggregate (1”) #57. Material shall meet AASHTO M43. (e) Concrete Aggregate (3/4”) #67. Material shall meet AASHTO M43.
