ITEM 446 ASPHALT CONCRETE

446.01 Description

446.02 JMF Field Adjustments

446.03 Monitoring

446.05 Density Acceptance

446.07 Basis of Payment

446.01 Description. This work consists of constructing a surface course or an intermediate course of aggregate and asphalt binder mixed in a central plant and spread and compacted on a prepared surface.

The requirements of Item 441 apply, except as modified by this specification.

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 JMF Field Adjustments. Determine the need for any JMF gradation adjustments, provided for in 441.05, in the first 3 days or first 3000 tons (3000 metric tons) of production, whichever comes last. Give the DET written notice of JMF adjustments no later than the end of the following day’s production.

For projects smaller than the above JMF field adjustment period, give the DET written notice of any JMF gradation adjustments within 1 workday following the last day of production.

446.03 Monitoring. If there is poor comparison between the Department’s comparison samples and the Contractor’s quality control tests, the Monitoring Team may at any time disallow production to continue under Item 446. In this case, conform to Items 448 and 446. The Department will notify the Contractor in writing to stop production.

446.04 Reports. Submit the Quality Control Report according to 441.11 on the workday following the production day of the material represented by the report.

446.05 Density Acceptance. Use compaction equipment meeting the requirements of 401.13 or other types acceptable to the Director. A three-wheel roller and a vertical longitudinal joint is not required. If a wedge joint is used, construct it using a maximum slope of 3:1.

Obtain 10 cores for the Department to test to determine the in-place density of the compacted mixture as a percentage of the average Maximum Specific Gravity (MSG) for the production day the material was placed. Compact shoulders using the same equipment and procedures as used on the mainline pavement. The requirements of 401.16, except for the last four paragraphs, are waived.

Payment for compaction of the completed mainline pavement and ramps is by Lot, based upon the degree to which density is attained. 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 an area of pavement placed during a production day, including the shoulders. 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. If greater than 250 tons (250 metric tons) and less than 400 tons (400 metric tons) is produced on the last day of production for the project, 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 areas and calculate the two random core locations from the mainline pavement or ramps. Cores can be obtained anywhere in the pavement mat up to 3 inches (75 mm) between the pavement edge and core edge. For the first part of a wedge joint, the pavement edge is defined as the point where the Contractor starts decreasing the thickness. For the second part of a wedge joint, the pavement edge is defined as the line where the second part meets the first part (the visible joint). Obtain cores 3 inches (75 mm) from the edge of the pavement when random numbers locate a core closer to the pavement edge than 3 inches (75 mm). Locate cores for the Contractor’s quality control (sister core) longitudinally from and within 4 inches (100 mm) of the random core.

The Department will determine the pay factor for each Lot cored by the pay schedule in Table 446.05-1. The Department will verify the MTD if the MSG determination has a deviation from the MTD of less than or equal to 0.020. If the MTD is not verified, establish a new MTD according to the procedures established in 441.09. If less than 10 cores are available for determining the mean, the Laboratory will determine disposition of the Lot.

Fill core holes by the next workday. 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.

TABLE 446.05-1

Mean of Cores[1]	Pay Factor
Mean of Cores[1]	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	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 District determines the course should be removed and replaced, the Contractor shall 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 District determines the course should be removed and replaced, the Contractor shall 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.

446.06 Joints. 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 Engineer may allow the Contractor to construct a cold longitudinal joint between the mainline pavement lanes and the adjoining shoulders.

446.07 Basis of Payment. The Department will pay for accepted quantities, completed in place, at the contract prices, as modified by 446.05, as follows:

Item unit Description

446 Cubic Yard Asphalt Concrete
(Cubic Meter) Intermediate Course, Type ___

446 Cubic Yard Asphalt Concrete Surface
(Cubic Meter) Course, Type ___