ITEM 446 ASPHALT CONCRETE CORE DENSITY ACCEPTANCE
446.01 Description. This specification describes the acceptance criteria for asphalt concrete
surface and intermediate courses using mat and joint cores from each day’s production. The Department will base acceptance of the compacted mixture in place on the level of density attained as sampled by the Contractor and analyzed by the Department.
446.02 Joint Construction. Make a hot longitudinal joint between the mainline pavement lane
and the adjoining shoulder and all ramps and the adjoining shoulders. If a hot longitudinal joint is specified between the mainline pavement lanes, the Contractor may construct a cold longitudinal joint between the mainline pavement lanes and the adjoining shoulders.
446.03 Core Procedures. Obtain core samples only in the presence of the Engineer and
immediately surrender each core sample to the Engineer for testing. If taken, locate cores obtained for Contractor quality control (QC comparison core) longitudinally from and within 4 inches (100 mm) of the Department core. In addition to the QC comparison cores, three extra cores may be taken from the first lot of a JMF for testing to correlate density gauges. Do no t take additional cores beyond what is noted above unless clearly identified in the Contractor’s QCP. Clearly label all cores with mat locations so that they may be readily identified. Any unlabeled cores may be destroyed by the Department. Notify the Department if any questions arise. Do not store additional cores anywhere (on the project, in vehicles, or at the plant) beyond those required for testing. Test all Contractor cores and maintain records of all tests (core tests and correlated gauge tests) according to the QCP. Destroy all Contractor cores immediately after testing is complete. Fill core holes by the next workday with asphalt concrete. Before filling, ensure the holes are dry and tack them with asphalt material conforming to 407.02. Properly compact the asphalt concrete used for filling the hole and leave it flush with the pavement.
446.04 Density Acceptance. Obtain ten, 4 -inch (100 mm) cores for the Department to test to
determine the in-place density of the compacted mixture as a percentage of the average QC Maximum Specific Gravity (MSG) for the production day the material was placed. If Department MSG VA tests show poor comparison to the average QC MSG according to 403.10 use Department determined MSG VA results in the density calculation for each production day. Payment for compaction of the completed mainline pavement and ramps is by Lot, based upon the degree to which density is attained. Compact shoulders using the same equipment and procedures as used on the mainline pavement. Payment for shoulders depends on the degree to which the density is obtained on the adjacent mainline pavement lane or ramp. However, when a cold longitudinal joint is made between a mainline pavement lane and an adjoining shoulder, payment for the shoulder will be based on the degree to which the density is obtained on the shoulder. A Lot consists of the area of pavement, including shoulders, placed using material produced in one production day as defined in 403.05. If any production day exceeds 3000 tons (2700 metric tons), the Engineer will divide the production day into two lots. If less than 400 tons (400 metric tons) is produced in a production day, then that production day is combined with the next production day into a single lot. On the last production day of the project, if greater than 250 tons (250 metric tons) are produced, then the day’s production is a separate Lot. If less than 250 tons (250 metric tons) is produced on the last production day for the project, it is part of the previous Lot for acceptance, provided the previous Lot was placed within 3 days; otherwise, it is a separate Lot. Within 48 hours after the pavement is placed, obtain ten cores for each Lot at random locations the Engineer determines. The Engineer will divide a Lot into five equal sublots and calculate two random core locations in each sublot as described below using ODOT TE -217 procedure. Both mainline pavement and ramps will be included in Lot determinations. The Engineer will not give the Contractor random core locations early in the Lot placement. The Engineer will tell the Contractor the method used to determine random locations as noted below before project start and will use the same method for all Lots. Take three cores from cold longitudinal joints (joint cores) and seven cores from the mat (mat cores). If locations not according to this specification are given, immediately inform the Engineer. Do not take joint cores from ramp joints. Take joint cores from the first, last and randomly from one of the three remaining sublots. Determine by random number the longitudinal location of the joint cores, and which longitudinal joint to core when the mat placed has two cold joints. Take joint cores such that the core's closest edge is 4 inches (100 mm) from the cold longitudinal joint. Obtain the mat cores from at least 12 inches (300 mm) away from the longitudinal joint. The Department will determine the pay factor for each Lot cored by the pay schedule in Table 446.04- 1 for Lots with three cold longitudinal joint cores and Table 446.04-2 for Lots with less than three cold longitudinal joint cores. If less than 10 cores are available for determining the mean, OMM will determine disposition of the Lot. The Contractor may dispute the results of the cores following
403.10 G.
TABLE 446.04-1 FOR LOTS WITH 3 COLD JOINT CORES Mean of Cores [1] Pay Factor Surface Course Intermediate Course 98.0% or greater [2] [2] 97.0 to 97.9% 0.94 [2] 96.0 to 96.9% 1.00 0.94 93.4 to 95.9% 1.04 [4] 1.00 92.4 to 93.3% 1.00 1.00 91.4 to 92.3% 0.98 1.00 90.4 to 91.3% 0.90 0.94 89.4 to 90.3% 0.80 0.88 88.4 to 89.3% [3] [3] Less than 88.4% [2] [2] [1] Mean of cores as percent of average MSG for the production day. [2] For surface courses, remove and replace. For other courses, the District will determine whether the material may remain in place. If the material may not remain in place, remove and replace this course and all courses paved on this course. The pay factor for material allowed to remain in place is 0.60. [3] The District will determine whether the material may remain in place. If the material may not remain in place, remove and replace this course and all courses paved on this course. The pay factor for material allowed to remain in place is 0.70. [4] No incentive will be paid if any single cold joint core is less than 91.0%. TABLE 446.04-2 FOR LOTS WITH LESS THAN 3 COLD JOINT CORES Mean of Cores [1] Pay Factor Surface Course Intermediate Course 98.0% or greater [2] [2] 97.0 to 97.9% 0.94 [2] 96.0 to 96.9% 1.00 0.94 94.0 to 95.9% 1.04 [4] 1.00 93.0 to 93.9% 1.00 1.00 92.0 to 92.9% 0.98 1.00 91.0 to 91.9% 0.90 0.94 90.0 to 90.9% 0.80 0.88 89.0 to 89.9% [3] [3] Less than 89.0% [2] [2] [1] Mean of cores as percent of average MSG for the production day. [2] For surface courses, remove and replace. For other courses, the District will determine whether the material may remain in place. If the material may not remain in place, remove and replace this course and all courses paved on this course. The pay factor for material allowed to remain in place is 0.60. [3] The District will determine whether the material may remain in place. If the material may not remain in place, remove and replace this course and all courses paved on this course. The pay factor for such material allowed to remain in place is 0.70. [4] No incentive will be paid for lots where 3 joint cores are required to be taken but less than 3 cores are taken.
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