HM Pacific Northwest Inc. 5/18/2023

I 1 The mix design will be the initial JMF for the class of HMA. The Contractor may request a 2 change in the JMF. Any adjustments to the JMF will require the approval of the Engineer I 3 and may be made in accordance with this section. 4 5 HMA Tolerances and Adjustments I 6 1. Job Mix Formula Tolerances —The constituents of the mixture at the time of 7 acceptance shall be within tolerance. The tolerance limits will be established as 8 follows: 9 For Asphalt Binder and Air Voids (Va), the acceptance limits are determined 10 by adding the tolerances below to the approved JMF values. These values I 11 will also be the Upper Specification Limit (USL) and Lower Specification Limit 12 (LSL) required in Section 1-06.2(2)D2 Property Non-Statistical Evaluation Commercial Evaluation Asphalt Binder +/-0.5% +/-0.7% Air Voids,Va 2.5% min. and 5.5% max N/A 13 For Aggregates in the mixture: 14 a. First, determine preliminary upper and lower acceptance limits by applying the I 15 following tolerances to the approved JMF. Aggregate Percent Non-Statistical Commercial Passing Evaluation Evaluation 1", 3/", 1/2", and 3/8"sieves +/-6% +/-8% No.4 sieve +/-6% +/-8% No. 8 Sieve +/-6% +/-8% No. 200 sieve +/-2.0% +/-3.0% I 16 b. Second, adjust the preliminary upper and lower acceptance limits determined 17 from step (a) the minimum amount necessary so that none of the aggregate 18 properties are outside the control points in Section 9-03.8(6). The resulting I 19 values will be the upper and lower acceptance limits for aggregates, as well as 20 the USL and LSL required in Section 1-06.2(2)D2. 21 2. Job Mix Formula Adjustments —An adjustment to the aggregate gradation or I 22 asphalt binder content of the JMF requires approval of the Engineer. Adjustments 23 to the JMF will only be considered if the change produces material of equal or 24 better quality and may require the development of a new mix design if the I 25 adjustment exceeds the amounts listed below. 26 a. Aggregates —2 percent for the aggregate passing the 11/2", 1", 3/4", 1/2", 3/", and 27 the No. 4 sieves, 1 percent for aggregate passing the No. 8 sieve, and 0.5 I 28 percent for the aggregate passing the No. 200 sieve. The adjusted JMF shall 29 be within the range of the control points in Section 9-03.8(6). 30 b. Asphalt Binder Content— The Engineer may order or approve changes to 31 asphalt binder content. The maximum adjustment from the approved mix 32 design for the asphalt binder content shall be 0.3 percent 33 34 5-04.3(9)A Vacant III 35 36 5-04.3(9)B Vacant I 37 38 5-04.3(9)C Mixture Acceptance — Nonstatistical Evaluation I 39 HMA mixture which is accepted by Nonstatistical Evaluation will be evaluated by the 40 Contracting Agency by dividing the HMA tonnage into lots. I 2023 FEDERAL OVERLAY FEDERAL AID#STBGUL-2715(011) I WO#3788 March 2,2023 SP-82