448Asphalt Concrete Gauge Density Acceptance

448.01 Description. This specification describes the acceptance criteria for asphalt concrete

surface and intermediate courses using density gauge and laboratory testing. The Department will determine acceptance of the mixture by Lot, based on the field density and mix composition of random samples taken and tested by the Contractor and verified by the Department.

448.02 Density. Conduct density gauge quality control testing on the asphalt mat according to

Supplement 1055. Do NOT enter a density gauge offset of any kind into the gauge. If an offset is already in the gauge remove it. Verify to the Engineer daily that no offset is present in the gauge. All values used in controlling mat density according to Supplement 1055 will be as calculated and written on forms supplied in Supplement 1055.

448.03 Reports. Report density gauge QC testing results according to Supplement 1055.

448.04 Acceptance. Acceptance is by Lot as defined in 403. A Lot is considered acceptable for

gradation and asphalt binder content if the deviation of the average from the JMF and the Range is no more than the tolerances shown in Table 448.04-1. TABLE 448.04-1 DEVIATION FROM THE JMF AND RANGE TOLERANCES [1] Mix Property Deviation from JMF (Percent) Range (Percent) Asphalt Binder Content 0.30 1.00 1/2 inch (12.5 mm) sieve 6 15 No. 4 (4.75 mm) sieve 5 15 No. 8 (2.36 mm) sieve 4 15 [1] Based on average of four Lot Acceptance tests. If the average of the Lot acceptance tests for a particular sieve or sieves, or for asphalt binder content deviates from the JMF by more than the tolerances shown in Table 448.04-1 but falls within the tolerances shown in Table 448.04-2, then the Lot is considered reasonably acceptable and may remain in place with payment at a reduced pay factor as show in Table 448.04-2. If the Range of the Lot acceptance tests for asphalt binder content or for any particular sieve, or sieves, exceeds the tolerance shown in Table 448.04-1, the Department will apply a pay factor of 0.95. TABLE 448.04-2 448 ACCEPTANCE SCHEDULE [1] Mix Property Pay Factor Tests Tests Tests Asphalt Binder Content 1.00 0 to 0.47 0 to 0.36 0 to 0.30 0.98 0.48 to 0.54 0.37 to 0.42 0.31 to 0.35 0.90 0.55 to 0.61 0.43 to 0.48 0.36 to 0.40 0.80 0.62 to 0.68 0.49 to 0.54 0.41 to 0.45 0.60 0.69 to 0.75 0.55 to 0.59 0.46 to 0.50 [2] > 0.75 > 0.59 > 0.50 1/2 inch (12.5 mm) sieve 1.00 0 to 8.5 0 to 6.9 0 to 6.0 0.99 8.6 to 9.9 7.0 to 8.1 6.1 to 7.0 0.97 10.0 to 11.3 8.2 to 9.2 7.1 to 8.0 0.94 11.4 to 12.7 9.3 to 10.4 8.1 to 9.0 0.90 12.8 to 14.1 10.5 to 11.5 9.1 to 10.0 [3] > 14.1 > 11.5 > 10.0 No. 4 (4.75 mm) sieve 1.00 0 to 7.1 0 to 5.8 0 to 5.0 0.99 7.2 to 8.5 5.9 to 6.9 5.1 to 6.0 0.97 8.6 to 9.9 7.0 to 8.1 6.1 to 7.0 0.94 10.0 to 11.3 8.2 to 9.2 7.1 to 8.0 0.90 11.4 to 12.7 9.3 to 10.4 8.1 to 9.0 [3] > 12.7 > 10.4 > 9.0 No. 8 (2.36 mm) sieve 1.00 0 to 5.7 0 to 4.6 0 to 4.0 0.99 5.8 to 7.1 4.7 to 5.8 4.1 to 5.0 0.97 7.2 to 8.5 5.9 to 6.9 5.1 to 6.0 0.94 8.6 to 9.9 7.0 to 8.1 6.1 to 7.0 0.90 10.0 to 11.3 8.2 to 9.2 7.1 to 8.0 [3] > 11.3 > 9.2 > 8.0 [1] Based on average of Lot Acceptance tests from the JMF. [2] Remove and replace material [3] Engineer will determine if the material may remain in place. Pay factor for material allowed to remain in place is 0.70. The Department will determine payment for the Lot by multiplying the contract unit price by the pay factor. When any pay factors for a specific Lot are less than 1.00, use the lowest pay factor to calculate the payment. The Department will base acceptance of partial Lots on the average and the Range of the results of tests on the number of samples obtained Payment for compaction of the completed pavement is based on quality assurance (QA) testing according to Supplement 1055. Each QA density test represents one half (1/2) day’s production. The Department will use Table 448.04-3 to determine the percent deduction pay adjustment due to density for each one half (1/2) day’s production represented by the QA test. TABLE 448.04-3 DENSITY PAY DEDUCTIONS Density (%) Payment Deduction One Test Below 91.0% Both Tests Below 92.0% 91.0 to 91.9 n/a 5% 90.0 to 90.9 5% 10% 89.0 to 89.9 15% 15% 88.0 to 88.9 30% 30% Less than 88.0 Remove and replace