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2025 PAVEMENT MAINTENANCE OVERLAY SPECIAL PROVISIONS <br />PW# 3830 <br /> SP-59 March 26, 2025 <br /> <br />Roadway cores for density may be obtained by either the Contracting Agency or the 1 <br />Contractor in accordance with WSDOT SOP 734. The core diameter shall be 4-inches 2 <br />minimum, unless otherwise approved by the Engineer. Roadway cores will be tested by 3 <br />the Contracting Agency in accordance with WSDOT FOP for AASHTO T 166. 4 <br /> 5 <br />If the Contract includes the Bid item “Roadway Core”, the cores shall be obtained by the 6 <br />Contractor in the presence of the Engineer on the same day the mix is placed and at 7 <br />locations designated by the Engineer. If the Contract does not include the Bid item 8 <br />“Roadway Core”, the Contracting Agency will obtain the cores. 9 <br /> 10 <br />For a lot in progress with a CPF less than 0.75, a new lot will begin at the Contractor’s 11 <br />request after the Engineer is satisfied that material conforming to the Specifications can 12 <br />be produced. 13 <br /> 14 <br />HMA mixture accepted by commercial evaluation and HMA constructed under conditions 15 <br />other than those listed above shall be compacted on the basis of a test point evaluation 16 <br />of the compaction train. The test point evaluation shall be performed in accordance with 17 <br />instructions from the Engineer. The number of passes with an approved compaction 18 <br />train, required to attain the maximum test point density, shall be used on all subsequent 19 <br />paving. 20 <br /> 21 <br />HMA for preleveling shall be thoroughly compacted. HMA that is used for preleveling 22 <br />wheel rutting shall be compacted with a pneumatic tire roller unless otherwise approved 23 <br />by the Engineer. 24 <br /> 25 <br />Test Results 26 <br />For a sublot that has been tested with a nuclear density gauge that did not meet the 27 <br />minimum of 92 percent of the reference maximum density in a compaction lot with a CPF 28 <br />below 1.00 and thus subject to a price reduction or rejection, the Contractor may request 29 <br />that a core be used for determination of the relative density of the sublot. The relative 30 <br />density of the core will replace the relative density determined by the nuclear density 31 <br />gauge for the sublot and will be used for calculation of the CPF and acceptance of HMA 32 <br />compaction lot. 33 <br /> 34 <br />When cores are taken by the Contracting Agency at the request of the Contractor, they 35 <br />shall be requested by noon of the next workday after the test results for the sublot have 36 <br />been provided or made available to the Contractor. Core locations shall be outside of 37 <br />wheel paths and as determined by the Engineer. Traffic control shall be provided by the 38 <br />Contractor as requested by the Engineer. Failure by the Contractor to provide the 39 <br />requested traffic control will result in forfeiture of the request for cores. When the CPF for 40 <br />the lot based on the results of the HMA cores is less than 1.00, the cost for the coring will 41 <br />be deducted from any monies due or that may become due the Contractor under the 42 <br />Contract at the rate of $200 per core and the Contractor shall pay for the cost of the 43 <br />traffic control. 44 <br /> 45 <br />5-04.3(10)A HMA Compaction – General Compaction Requirements 46 <br />Compaction shall take place when the mixture is in the proper condition so that no undue 47 <br />displacement, cracking, or shoving occurs. Areas inaccessible to large compaction 48