independently of the mainline shall be tested as per MP 401.07.21. However, compaction penalty calculations for these independently constructed shoulders shall not apply.
410.7.1.4 -Thickness: Thickness testing shall be performed on all traveled lanes, ramps and independently constructed shoulders. Cores obtained for mat density and bond strength will both be measured for thickness as per MP 410.07.22 Measurement for Thickness of Asphalt Pavement Using Drilled Cores, prior to those subsequent analyses. The core measurements which represent the thickness of the sampling units shall be analyzed to determine the average value of the pavement thickness. Pavement Thickness (T) shall include all of the pavemen t layers as specified excluding any patch and level course and scratch courses. This value will be used to determine the degree of compliance with the provisions and to develop certain factors to be used in the derivation of equitable deductions as set forth in Section 410.13.5, in the event the provisions of this Specification are not met.
410.7.1.5 -Bond Strength : Bond Strength Testing shall be conducted to ensure the creation of a monolithic layered pavement; this is typically achieved by the applic ation of a tack coat between pavement layers. Any tack coats applied by the Contractor shall be applied in accordance with Section 408. Bond Testing shall be performed on all surface layers beginning with the existing pavement layer and then all intermediate pavement layers called for in the proposal and plans, this testing shall be performed on all traveled lanes and shoulders. Bond Testing is not required for pavement layers placed on top of a granular type layer (aggregate base, rubblized concrete, maca dam, etc.). If an asphalt pavement layer is to be placed atop a concrete surface, Bond Strength testing is not required however, a tack coat shall be applied in accordance with Section 408 to ensure complete coverage of the surface and to the satisfaction of the Engineer. Core bond strength shall exceed a minimum of 100 psi when tested in accordance to MP 410.07.23 Guide to Determining Interface Bond Shear Strength.
410.7.2 -Surface Tolerance: Shall be in accordance with Section 720 on the finished mat.
410.7.3 -Pattern Segregation: Pattern segregation is continuous or repeated areas of non - uniform distribution of coarse and fine aggregate particles in the finished mat. The Division will address pattern segregation as follows:
410.7.3.1 -Evaluating Pattern Segregation: If the Engineer observes pattern segregation that may result in defective pavement, then:
ii. The Contractor may continue to work at their own risk while they immediately and continually adjust the operation to eliminate the pattern segregation from future work. iii. As a minimum and in the presence of the Engineer and the Contractor’s Representative, Division personnel shall determine the average dep th of pavement surface macrotexture according to MP 401.07.24 in areas with the pattern segregation and in areas with non -segregated pavement. The pattern segregation is unacceptable if the difference in average pavement texture depth between the non - segregated and segregated areas exceeds the following:
207 a. For 9.5 mm or Wearing I mixes – 0.012 inch
iv. The Engineer will determine if the pavement is defective as specified in Section 410.7.3.3.
410.7.3.2 -Test Section : If the macrotexture tests identify unacceptable pattern segregation, then:
segregation according to the Paving Operation QC Plan. Provide proposed corrective actions to the Engineer and do not resume placing the asphalt course until after the Engineer reviews the proposed corrective actions and authorizes paving to continue. ii. Determine if the pattern segregation resulted in defective pavement as specified in iii. After the Engineer allows paving to resume, place a test section not to exceed 200 tons. If the corrective actions do not eliminate observed pattern segregation, the Department will suspend paving, even if it is before the Contractor places the entire test section. Propose additional corrective actions and construct another test section. Resume normal paving operations after constructing an entire test section without pattern segregation as determined by the Engineer.
410.7.3.3 -Defective Pavement : At lo cations selected by the Engineer and with the Engineer present, drill three six (6) inch diameter cores from the area of pattern segregation and three cores from the pavement representing a non-segregated area. Do not compress, bend, or distort samples during cutting and handling and immediately provide the cores to the Inspector. The Inspector will transport cores to the producer’s laboratory. With the Engineer present, test the cores at the plant for density, asphalt content, and gradation. Additional cores and/or additional testing as per MP 401.07.24 Measuring Pavement Macrotexture Depth can be used to further evaluate the pavement. An area of pattern segregation contains defective pavement if:
JMF;
The core density is defective, or the cores are defective for asphalt content or gradation of the 75 μm (No. 200) sieve if the PWL is less than 55 as determined in accordance with MP 401.13.50 and based on three samples (n=3). Remove and replace the full width of the affected lane and a minimum of five ( 5) feet beyond each end of the area with unacceptable pattern segregation. Construct replacement pavement conforming to the appropriate surface tolerances.
410.7.4 -Flushing: Provide a mix that will not flush. Fl ushing is continuous or repeated areas of excessive asphalt on the pavement surface. The Division may recognize flushing until the Division approves the project through final inspection. The Division will address flushing as follows: