necessary equipment and qualified personnel including at least one certified Asphalt Field and Compaction Technician at each project during paving operations. Additionally, a certified Asphalt Field and Compaction Technician with certification to perform nuclear density testing of asphalt pavements shall perform all testing necessary to assure compaction of the asphalt meets spe cification requirements.
410.6.2 -Job Mix Formula Field Verification : For each JMF, a mix design field verification shall be conducted during the first days of plant production. For Marshall and Superpave designs, the verification shall be in accordance with the guidelines established in MP 401.02.31. The field verification is for the purpose of demonstrating that the JMF can be produced within the specified tolerances set forth in the MP 401.02.31. If the mix cannot be produce within these requirements, a new mix design will be required.
410.6.3 -Quality Control Testi ng Requirements: After the JMF design field verification has been successfully completed, sampling frequency and test requirements for quality control shall be as set forth in MP 401.02.31 for Marshall and Superpave designs. If the Division determines th at a mix cannot be consistently produced within the tolerance limits of the specified design properties, approval of the mix may be revoked and the contractor will be required to provide a new mix design.
410.7 -ACCEPTANCE TESTING : 410.7.1 -Acceptance Testing of Asphalt: For Interstates and divided National Highway System (NHS) Highways, material from the paving of the traveled lanes and shoulders will be accepted in the field on a lot -by-lot basis. Lots will be established cumulatively and will be specific for each JMF. Each lot consists of five equal sublots (n=5). A completed sublot will have cores obtained for Pavement Density, and Bond Strength and a L oose Mixture sample for gradation and asphalt content. Samples for mat density and bond strength shall also be used to measure lift thickness prior to any preparation for density or bond strength. All field samples shall be obtained from locations determined as per MP 401.07.20 and MP 401.07.21. A normal lot size is 2,500 tons with five, 500 -ton sublots (n=5), unless operational conditions or project size dictate otherwise. If operational conditions or project size dictate, readjustment of the lot will be made as specified in Table 410.7.1. When lots are adjusted, all sublots shall be of equal size. Breakdowns or stoppages of short periods due to such causes as weather or equipment failure will not be considered as reason to adjust the lot size. The original lot will be continued when work resumes after stoppages of less than 5 days. If a lot is terminated due to a stoppage of 5 days or more, adjust the lot size and number of sublots as specified in Table 410.7.1. For two lane and non -divided NHS Routes, refer to Section 410.13.7.1.
204 TABLE 410.7.1 Re-adjustment of Lot Size and Associated Number of Sublots Remaining Quantity Following Last Full Lot Action Less than 500 tons without a combination of one mixture acceptance sample and one density core Quantity combined with the previous lot, (n=5) Less than 500 tons with a combination of one mixture acceptance sample and one density core One new sublot def ined and quantity combined with the previous lot, (n=6) 500 tons to less than 1,000 tons without a combination of two mixture acceptance samples and two density cores One new sublot defined and quantity combined with the previous lot, (n=6) 500 tons t o less than 1,000 tons with a combination of two mixture acceptance samples and two density cores Two new sublots defined and quantity combined with the previous lot, (n=7) 1,000 tons to less than 1,500 tons without a combination of three mixture acceptance samples and three density cores Two new sublots defined and quantity combined with the previous lot, (n=7) 1,000 tons to less than 1,500 tons with a combination of three mixture acceptance samples and three density cores New lot defined, (n=3) 1,500 tons to less than 2,000 tons without a combination of four mixture acceptance samples and four density cores New lot defined, (n=3) 1,500 tons to less than 2,000 tons with a combination of four mixture acceptance samples and four density cores New lot defined, (n=4) 2,000 tons to less than 2,500 tons without a combination of five mixture acceptance samples and five density cores New lot defined, (n=4) 2,000 tons to less than 2,500 tons with a combination of five mixture acceptance samples and fi ve density cores New lot defined, (n=5)
Immediately after each sample is taken, it shall be identified by labeling or otherwise with the following information:
205 A sample labeling standard is shown in MP 401.07.20 Sampling of Loose Asphaltic Pavement Mixtures and MP 401.07.21. Upon fully identifying, marking, or labeling, and securing, samples shall be transported to the District Materials Laboratory for testing unless otherwise indicated in the proposal.
410.7.1.1 -Mixture Acceptance Samples : The Inspector will select sample locations in each sublot according to MP 401.07.20 Sampling of Loose Asphaltic Pavement Mixtures. The Inspector or in the presence of the Inspector, one loose mixture sample shall be obtained for each sublot. This sample is to be taken directly from the uncompacted mixture and immediately processed in accordance with the MP.
410.7.1.2 -Compaction : Compaction testing for mat density shall be performed for all traveled lanes, ramps and shoulders. Work will be evaluated based on an Upper Specification Limit (USL) of 98.0 and a Lower Specification Limit (LSL) of 91.5 for all mats within travel lanes. Acceptance of mat density shall be in accordance with subsection
410.13.3
Maximum density values that are supplied by the asphalt producer shall be verified by the District Materials st aff by determining the theoretical maximum specific gravity in accordance with AASHTO T209 Theoretical Maximum Specific Gravity (Gmm). This verification of Gmm shall be conducted once per lot for all mixes, or one in each five reported values from the asphalt producer. This Gmm value must be within 0.024 of the asphalt producer’s daily average. Any deviation of greater shall warrant special evaluation. Joint density testing is required. The joint density shall be evaluated based on a Lower Specification Limit (LSL) of 89% of a maximum density established by averaging the maximum densities for the paved mats adjacent to the constructed longitudinal joint. The joint density requirement shall only apply to the surface lift of the pavement structure. Lots for joint density shall also be established cumulatively and laid out as per the applicable provisions within MP 401.07.21. A normal lot size for evaluation of joint density is 10,000 linear feet of constructed joint with five, 2000 foot long sublots, unless operational conditions or project size dictate otherwise. Lots for joint density determined to be 4000 feet in length or less shall be incorporated into the previous full lot. If the length is 2000 feet or less, then on e sample shall be taken, and the lot be evaluated with six equal sublots (n=6). If the length is greater than 2000 feet, then two samples shall be taken, and the lot be evaluated with seven equal sublots (n=7). Lots for joint density that are greater than 4000 feet in length shall have samples taken representative of each 2000 -foot long sublot or portion thereof. Acceptance for joint density shall be as per 410.13.4. Patching -and-leveling and scratch courses shall not be included in determining the total new pavement thickness to be tested for compaction. When asphalt is placed in areas that require a non -uniform thickness or is tapered to a thin edge, the method of acceptance testing shall be determined by the Engineer. Acceptance testing is not required on areas in which a full -size roller is restricted from compacting the mat properly. These areas shall be compacted to the satisfaction of the Engineer.
410.7.1.3 -Shoulders and Ramps: As per MP 401.07.21, shoulders and ramp areas that are constructed simultaneously with the mainline are not included in the sampling plan. However, these simultaneously constructed shoulder and ramp areas shall be included in the lot of the adjacent mainline for the purposes of penalty calculations for compaction and mixture properties.
206 Shoulders that are constructed 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: