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2025 PAVEMENT MAINTENANCE OVERLAY SPECIAL PROVISIONS <br />PW# 3830 <br /> SP-55 March 26, 2025 <br /> <br /> 1 <br />For Asphalt Binder and Air Voids (Va), the acceptance limits are determined 2 <br />by adding the tolerances below to the approved JMF values. These values 3 <br />will also be the Upper Specification Limit (USL) and Lower Specification Limit 4 <br />(LSL) required in Section 1-06.2(2)D2 5 <br /> 6 <br />Property Non-Statistical Evaluation Commercial Evaluation <br />Asphalt Binder +/- 0.5% +/- 0.7% <br />Air Voids, Va 2.5% min. and 5.5% max N/A <br /> 7 <br />For Aggregates in the mixture: 8 <br /> 9 <br />a. First, determine preliminary upper and lower acceptance limits by applying 10 <br />the following tolerances to the approved JMF. 11 <br /> 12 <br />Aggregate Percent <br />Passing <br />Non-Statistical <br />Evaluation <br />Commercial <br />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 /> 13 <br />b. Second, adjust the preliminary upper and lower acceptance limits 14 <br />determined from step (a) the minimum amount necessary so that none of 15 <br />the aggregate properties are outside the control points in Section 9-16 <br />03.8(6). The resulting values will be the upper and lower acceptance limits 17 <br />for aggregates, as well as the USL and LSL required in Section 1-18 <br />06.2(2)D2. 19 <br /> 20 <br />2. Job Mix Formula Adjustments – An adjustment to the aggregate gradation or 21 <br />asphalt binder content of the JMF requires approval of the Engineer. Adjustments 22 <br />to the JMF will only be considered if the change produces material of equal or 23 <br />better quality and may require the development of a new mix design if the 24 <br />adjustment exceeds the amounts listed below. 25 <br /> 26 <br />a. Aggregates –2 percent for the aggregate passing the 1½″, 1″, ¾″, ½″, ⅜″, and 27 <br />the No. 4 sieves, 1 percent for aggregate passing the No. 8 sieve, and 0.5 28 <br />percent for the aggregate passing the No. 200 sieve. The adjusted JMF shall 29 <br />be within the range of the control points in Section 9-03.8(6). 30 <br /> 31 <br />b. Asphalt Binder Content – The Engineer may order or approve changes to 32 <br />asphalt binder content. The maximum adjustment from the approved mix 33 <br />design for the asphalt binder content shall be 0.3 percent. 34 <br /> 35 <br />5-04.3(9)A Vacant 36 <br /> 37 <br />5-04.3(9)B Vacant 38 <br /> 39 <br />5-04.3(9)C Mixture Acceptance – Nonstatistical Evaluation 40