Thomco Construction Inc. 6/14/2021

I CITY OF EVERETT SPECIAL PROVISIONS The mix design will be the initial JMF for the class of HMA. The Contractor may request a change in the JMF. Any adjustments to the JMF will require the Engineer's approval and may be made in accordance with this section. 5-04.3(9)A HMA Tolerances and Adjustments 1. Job Mix Formula Tolerances — Provide mixture at the time of acceptance within the following tolerances: For Asphalt Binder and Air Voids (Va), the acceptance limits are determined by adding the tolerances below to the approved JMF values. These values will also be the Upper Specification Limit (USL) and Lower Specification Limit (LSL) required in Section 1-06.2(2)D2. Property Non-Statistical Commercial Evaluation Evaluation Asphalt +/- 0.5% +/- 0.7% Binder Air Voids, Va 2.5% min. and 5.5% N/A max For Aggregates in the mixture: a. First, determine preliminary upper and lower acceptance limits by applying the following tolerances to the approved JMF. Aggregate Percent Non-Statistical Commercial Evaluation Passing Evaluation 1", 3/4", 1/", and 3/8" sieves +/- 6% +/- 8% No. 4 sieve +/-6% +/- 8% No. 8 Sieve +/- 6% +/-8% No. 200 sieve +/- 2.0% +/- 3.0% b. Second, adjust the preliminary upper and lower acceptance limits determined from step (a) the minimum amount necessary so that none of the aggregate properties are outside the control points in Section 9-03.8(6). The resulting values will be the upper and lower acceptance limits for aggregates, as well as the USL and LSL required in Section 1-06.2(2)D2. 2. Job Mix Formula Adjustments — An adjustment to the aggregate gradation or asphalt binder content of the JMF requires Engineer's approval. Adjustments to the JMF will only be considered if the change produces material of equal or better quality and may require the development of a new mix design if the adjustment exceeds the amounts listed below. a. Aggregates — 2 percent for the aggregate passing the 11/2", 1", 3/" 1/2" %", and the No. 4 sieves, 1 percent for aggregate passing the No. 8 sieve, and 0.5 percent for the aggregate passing the No. 200 sieve. Provide the adjusted JMF within the range of the control points in Section 9-03.8(6). b. Asphalt Binder Content—The Engineer may order or approve changes to asphalt binder content. The maximum adjustment from the approved mix design for the asphalt binder content is 0.3 percent. Water Main Replacement"V" Division 5—SURFACE TREATMENTS April,2021 WO No.—UP3730 AND PAVEMENTS SP-154 I