Angela Street Bridge_AA 2023-0515

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February 26, 2018 Page 4 of 7 HMA.06 (intentionally left blank) HMA.07 Mix Criteria HMA wedge and leveling mixtures shall consist of surface or intermediate mixtures in accordance with HMA.04. Aggregate requirements of 904.03(d) do not apply when the wedge and leveling mixture is covered by a surface or intermediate mixture. Temporary HMA mixtures shall be the type specified in accordance with HMA.04. A MAF in accordance with 402.05 will not apply. HMA curbing mixes shall be HMA surface type B in accordance with 402 except 402.05 shall not apply and RAP shall not be used. The binder content shall be 7.0% and the gradations shall meet the following: HMA Curbing Gradations Sieve Size Percent Passing 1/2 in. (12.5 mm) 100.0 3/8 in. (9.5 mm) 80.0 – 100.0 No. 4 (4.75 mm) 73.0 ± 5.0 No. 30 (600 µm) 20.0 – 50.0 No. 200 (75 µm) 6.0 – 12.0 HMA.08 Recycled Material Recycled Materials shall meet the requirements of Section 401.06. MAXIMUM BINDER REPLACEMENT PERCENTAGE Mix Type Base and Intermediate Surface Dense Graded Dense Graded 25.0 mm 19.0 mm 12.5 mm 9.5 mm 12.5 mm 9.5 mm 4.75 mm A 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* B 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* C 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0/40.0* 25.0* 25.0* 25.0* *Note: The contribution of RAS to any HMA mixture shall be ≤ 3.0% by total mass of mixture and ≤ 15.0% binder replacement. IMPORTANT NOTE: The above table gives the designer the option to specify a maximum binder replacement of either 25.0% or 40.0% for all dense graded asphalt mixtures, excluding Type C surfaces. In 2016, INDOT revised their specifications to reduce the maximum allowable binder replacement percentage from 40.0% to 25.0% for all dense graded asphalt mixtures. However, higher RAP/RAS mixtures are more sustainable and economical. It is NAPA (National Asphalt Pavement Association) and APAI’s positions that higher binder replacement percentages can be utilized without compromising durability and longevity of the asphalt pavement when properly designed. The Departments of Transportation for some surrounding states allow for higher binder replacement percentages than 25.0%. For asphalt projects using this Guide Specification, the Agency/Owner should use proper engineering judgement on a project-by-project basis to select the maximum binder replacement in the table above.