Specifications include, but are not limited to: This material shall consist of crushed limestone or approved equal, complying with the requirements of ASTM C-136 for stone size #89 or #9 in the following manner: SIEVE SIZE - SQUARE OPENING PERCENTAGE BY WEIGHT PASSING 3/8" No. 4 No. 8 No. 16 No. 50 90-100 20-55 5-30 0-10 0-5 The bituminous material shall be Liquid Asphalt Blend. When prepared from a base asphalt stock either AC-10, AC-2000, AR-4000, 85-100 penetration or 120-150 penetration, and blended. The formula shall be in the 4.5 to 7.0 percent range for a job mix. COMPOSITION OF MIXTURE Modification in the graduation of the aggregate and for the amount of bitumen in the mix may be made to obtain optimum placing and finishing characteristics. However, these modifications shall be made only when approved or directed by the City Engineer and/or Director of Public Works. Any modification approved or directed will be made at no change in the unit prices stated in the proposal.
