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2025 PAVEMENT MAINTENANCE OVERLAY SPECIAL PROVISIONS <br />PW# 3830 <br /> SP-46 March 26, 2025 <br /> <br />· The Mix Design Report for the proposed HMA mix design developed by a 1 <br />qualified City or County laboratory that is within one year of the approval date. 2 <br /> 3 <br />The mix design shall be performed by a lab accredited by a national authority such as 4 <br />Laboratory Accreditation Bureau, L-A-B for Construction Materials Testing, The 5 <br />Construction Materials Engineering Council (CMEC’s) ISO 17025 or AASHTO 6 <br />Accreditation Program (AAP) and shall supply evidence of participation in the AASHTO: 7 <br />resource proficiency sample program. 8 <br /> 9 <br />Mix designs for HMA accepted by Nonstatistical evaluation shall: 10 <br /> 11 <br />· Be designed for 12 <br />*** 13 <br />o 7500 Evergreen Way, S/B right lane - Bruin Blvd to 75th St – 16.0 14 <br />o Evergreen Way, N/B right lane - Everett Mall Way to 100th St – 14.0 15 <br />o Ross Ave - 35th Ave NE to 12th St NE – 8.0 16 <br />o 34th Ave NE - Ross Ave to SB 529 Off Ramp – 8.0 17 <br />o E Casino Rd - Bruin Blvd to Beverly Blvd – 6.0 18 <br />*** 19 <br />million equivalent single axle loads (ESALs). 20 <br />· Have the aggregate structure and asphalt binder content determined in 21 <br />accordance with WSDOT Standard Operating Procedure 732 and meet the 22 <br />requirements of Sections 9-03.8(2), except that Hamburg testing for ruts and 23 <br />stripping are at the discretion of the Engineer, and 9-03.8(6). 24 <br />· Have anti-strip requirements, if any, for the proposed mix design determined in 25 <br />accordance with AASHTO T 283 or T 324 or based on historic anti-strip and 26 <br />aggregate source compatibility from previous WSDOT lab testing. 27 <br /> 28 <br />At the discretion of the Engineer, agencies may accept verified mix designs older than 12 29 <br />months from the original verification date with a certification from the Contractor that the 30 <br />materials and sources are the same as those shown on the original mix design. 31 <br /> 32 <br />Commercial Evaluation Mix Design. Approval of a mix design for “Commercial 33 <br />Evaluation” will be based on a review of the Contractor’s submittal of WSDOT Form 350-34 <br />042 (for commercial mixes, AASHTO T 324 evaluation is not required) or a Mix Design 35 <br />from the current WSDOT QPL or from one of the processes allowed by this section. 36 <br />Testing of the HMA by the Contracting Agency for mix design approval is not required. 37 <br /> 38 <br />For the Bid Item Commercial HMA, the Contractor shall select a class of HMA and 39 <br />design level of ESALs appropriate for the required use. 40 <br /> 41 <br />5-04.2(2)B Using Warm Mix Asphalt Processes 42 <br />The Contractor may elect to use additives that reduce the optimum mixing temperature 43 <br />or serve as a compaction aid for producing HMA. Additives include organic additives, 44