Laserfiche WebLink
CITY OF EVERETT SPECIAL PROVISIONS <br /> <br />Water Main Replacement “Y” – Ph 1 Div 5 – SURFACE TMTS & PVMTS March 2024 <br />Work Order No. UP 3814 SP-168 <br />pavement, and pavement repair. Engineer will need to approve other nonstructural <br />applications of HMA accepted by commercial evaluation. Sampling and testing of HMA <br />accepted by commercial evaluation will be at the Engineer’s option. <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 Engineer’s <br />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 <br />determined by adding the tolerances below to the approved JMF values. <br />These values will also be the Upper Specification Limit (USL) and Lower <br />Specification Limit (LSL) required in Section 1-06.2(2)D2. <br />Property <br />Non-Statistical <br />Evaluation <br />Commercial <br />Evaluation <br />Asphalt <br />Binder +/- 0.5% +/- 0.7% <br />Air Voids, Va <br />2.5% min. and <br />5.5% max N/A <br /> <br />For Aggregates in the mixture: <br />a. First, determine preliminary upper and lower acceptance limits by <br />applying the following tolerances to the approved JMF. <br />Aggregate Percent Passing <br />Non-Statistical <br />Evaluation 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 <br />of the aggregate properties are outside the control points in Section 9- <br />03.8(6). The resulting values will be the upper and lower acceptance <br />limits for aggregates, as well as the USL and LSL required in Section 1- <br />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 <br />Engineer’s approval. Adjustments to the JMF will only be <br />considered if the change produces material of equal or better <br />quality and may require the development of a new mix design if <br />the adjustment exceeds the amounts listed below. <br />a. Aggregates – 2 percent for the aggregate passing the <br />1½″, 1″, ¾″, ½″, ⅜″, and the No. 4 sieves, 1 percent for <br />aggregate passing the No. 8 sieve, and 0.5 percent for <br />the aggregate passing the No. 200 sieve. Provide the <br />adjusted JMF within the range of the control points in <br />Section 9-03.8(6).