181-26 Exhibit A- Final Specifications_compressed.pdf

DIVISION 900 – MATERIALS SECTION 902 – ASPHALT 902.01.01 Asphalt Binder THE FIRST TWO PARAGRAPHS ARE CHANGED TO: Use an asphalt binder that is storage-stable and conforms to AASHTO M 332. Include compliance with the elastic response requirement in Figure 1 of AASHTO R 92, if applicable. 902.02.01 Mix Designations PART (4) IS CHANGED TO: 4. “E” The fourth field in the Item description designates the high temperature designation of the performance- graded binder. Options are “64” for PG 64S-22 and “E” for PG 64E-22. 902.02.03 Mix Design THE FOLLOWING IS ADDED TO THE FIRST PARAGRAPH: Unless otherwise approved by the engineer, only one source of supply for hot mix asphalt surface course may be used on the project. 902.02.04 Sampling and Testing A General Acceptance Requirements. THE SECOND PARAGRAPH OF SECTION (A) IS CHANGED TO: For PG 64S-22, ensure that the temperature of the mixture at discharge from the plant or surge and storage bins is at least 290 °F when the ambient temperature is less than 50 °F or is at least 275 °F when the ambient temperature is greater than or equal to 50 °F. For PG 64E-22, ensure that the temperature of the mixture at discharge from the plant or surge and storage bins is at least 10 °F above the manufacturer’s recommended laydown temperature. For mixes produced using a WMA additive or process, ensure that the temperature of the mixture at discharge from the plant or surge and storage bins is at least 10 °F above the WMA manufacturer’s recommended laydown temperature. D. Acceptance Testing and Requirements. PART D IS CHANGED TO: The ME will determine volumetric properties at Ndes for acceptance from samples taken, compacted, and tested at the HMA plant. The ME will compact HMA to the number of design gyrations (N des) specified in Table 902.02.03-2, using equipment according to AASHTO T 312. The ME will determine bulk specific gravity of the compacted sample according to AASHTO T 166. The ME will use the most current QC maximum specific gravity test result in calculating the volumetric properties of the HMA. The ME will determine the dust-to-binder ratio from the composition results as tested by the QC technician. Ensure that the HMA mixture conforms to the requirements specified in Table

e HMA. The ME will determine the dust-to-binder ratio from the composition results as tested by the QC technician. Ensure that the HMA mixture conforms to the requirements specified in Table 902.02.04-1, and to the gradation requirements in Table 902.02.03-1. If the test results are outside of the gradation or volumetric requirements specified in Table 902.02.03-1 or Table 902.02.04-1 for an acceptance sample, immediately run a quality control sample. If the quality control sample is also outside of the requirements specified in Table 902.02.03-1 or Table 902.02.04-1, determine if a plant adjustment is needed and take corrective action to bring the mix into compliance. Take an additional quality control sample immediately after completing the corrective action to ensure that the mix is within the requirements. If the mix is within the requirements based on the quality control sample results, then the ME will HELEN AVE., LAWRENCE AVE., FLORENCE PL., AND LOWELL AVE., IMPROVEMENTS PROJECT Page 69 of 76