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Edgewater Creek Bridge Replacement November 2023 98 • The WSDOT Mix Design Evaluation Report from the current WSDOT QPL, or 1 one of the mix design verification certifications listed below. 2 • The proposed HMA mix design on WSDOT Form 350-042 with the seal and 3 certification (stamp & sig-nature) of a valid licensed Washington State 4 Professional Engineer. 5 • The Mix Design Report for the proposed HMA mix design developed by a 6 qualified City or County laboratory that is within one year of the approval date.** 7 8 The mix design shall be performed by a lab accredited by a national authority such as 9 Laboratory Accreditation Bureau, L-A-B for Construction Materials Testing, The 10 Construction Materials Engineering Council (CMEC’s) ISO 17025 or AASHTO 11 Accreditation Program (AAP) and shall supply evidence of participation in the AASHTO: 12 resource proficiency sample program. 13 14 Mix designs for HMA accepted by Nonstatistical evaluation shall; 15 16 • Have the aggregate structure and asphalt binder content determined in 17 accordance with WSDOT Standard Operating Procedure 732 and meet the 18 requirements of Sections 9-03.8(2), except that Hamburg testing for ruts and 19 stripping are at the discretion of the Engineer, and 9-03.8(6). 20 • Have anti-strip requirements, if any, for the proposed mix design determined in 21 accordance with AASHTO T 283 or T 324, or based on historic anti-strip and 22 aggregate source compatibility from previous WSDOT lab testing. 23 24 At the discretion of the Engineer, agencies may accept verified mix designs older than 12 25 months from the original verification date with a certification from the Contractor that the 26 materials and sources are the same as those shown on the original mix design. 27 28 Commercial Evaluation Approval of a mix design for “Commercial Evaluation” will be 29 based on a review of the Contractor’s submittal of WSDOT Form 350-042 (For 30 commercial mixes, AASHTO T 324 evaluation is not required) or a Mix Design from the 31 current WSDOT QPL or from one of the processes allowed by this section. Testing of the 32 HMA by the Contracting Agency for mix design approval is not required. 33 34 For the Bid Item Commercial HMA, the Contractor shall select a class of HMA and 35 design level of Equivalent Single Axle Loads (ESAL’s) appropriate for the required use. 36 37 5-04.2(2)B Using Warm Mix Asphalt Processes 38 The Contractor may elect to use additives that reduce the optimum mixing temperature 39 or serve as a compaction aid for producing HMA. Additives include organic additives, 40 chemical additives and foaming processes. The use of Additives is subject to the 41 following: 42 43 • Do not use additives that reduce the mixing temperature more than allowed in 44 Section 5-04.3(6) in the production of mixtures. 45 • Before using additives, obtain the Engineer’s approval using WSDOT Form 350-46 076 to describe the proposed additive and process. 47 48