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CITY OF EVERETT SPECIAL PROVISIONS <br /> <br />3rd Ave Water Quality Facility Division 5 – SURFACE TREATMENTS September 12, 2024 <br />AND PAVEMENTS <br />WO No. – UP 3775 SP - 156 <br />The mix design will be the initial JMF for the class of HMA. The Contractor may <br />request a change in the JMF. Any adjustments to the JMF will require the <br />Engineer’s approval and may be made in accordance with this section. <br />5-04.3(9)A HMA Tolerances and Adjustments <br />1. Job Mix Formula Tolerances – Provide mixture at the time of <br />acceptance within the following tolerances: <br />For Asphalt Binder and Air Voids (Va), the acceptance limits are determined <br />by adding the tolerances below to the approved JMF values. These values <br />will also be the Upper Specification Limit (USL) and Lower Specification Limit <br />(LSL) required in Section 1-06.2(2)D2. <br />Property Non-Statistical <br />Evaluation <br />Commercial <br />Evaluation <br />Asphalt <br />Binder <br />+/- 0.5% +/- 0.7% <br />Air Voids, Va 2.5% min. and 5.5% <br />max <br />N/A <br />For Aggregates in the mixture: <br />a. First, determine preliminary upper and lower acceptance limits by applying <br />the following tolerances to the approved JMF. <br />Aggregate Percent <br />Passing <br />Non-Statistical <br />Evaluation <br />Commercial Evaluation <br />1”, ¾”, ½”, and 3/8” sieves +/- 6% +/- 8% <br />No. 4 sieve +/-6% +/- 8% <br />No. 8 Sieve +/- 6% +/-8% <br />No. 200 sieve +/- 2.0% +/- 3.0% <br />b. Second, adjust the preliminary upper and lower acceptance limits <br />determined from step (a) the minimum amount necessary so that none of <br />the aggregate properties are outside the control points in Section 9-03.8(6). <br />The resulting values will be the upper and lower acceptance limits for <br />aggregates, as well as the USL and LSL required in Section 1-06.2(2)D2. <br />2. Job Mix Formula Adjustments – An adjustment to the aggregate <br />gradation or asphalt binder content of the JMF requires Engineer’s <br />approval. Adjustments to the JMF will only be considered if the change <br />produces material of equal or better quality and may require the <br />development of a new mix design if the adjustment exceeds the <br />amounts listed below. <br />a. Aggregates – 2 percent for the aggregate passing the 1½″, 1″, <br />¾″, ½″, ⅜″, and the No. 4 sieves, 1 percent for aggregate <br />passing the No. 8 sieve, and 0.5 percent for the aggregate <br />passing the No. 200 sieve. Provide the adjusted JMF within the <br />range of the control points in Section 9-03.8(6). <br />b. Asphalt Binder Content – The Engineer may order or approve <br />changes to asphalt binder content. The maximum adjustment <br />from the approved mix design for the asphalt binder content is <br />0.3 percent.