ITEM 448 ASPHALT CONCRETE
448.01
Description
448.02 JMF Field Adjustments
448.03 Density
448.04
Reports
448.05
Acceptance
448.06 Basis of
Payment
448.01 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 Department will determine acceptance of the mixture by Lot, based on the
composition of random samples taken and tested by the Contractor and verified
by the Department.
The
requirements of Item 441 apply, except as modified by
this specification.
448.02 JMF Field Adjustments. Determine
the need for any JMF gradation adjustments, provided
for in 441.05, from the results of quality
control and Department verification tests of the first two acceptance
lots. Following adjustment, the Department will apply the adjusted JMF, for acceptance purposes, to the entire production
including the first two lots. Give the DET
written notice of JMF adjustments no later than the
end of the first workday following the notification of verification test
results of the second acceptance lot.
For
projects with less than two acceptance lots or for any JMF
that will no longer be used on a project, give the DET
written notice of any JMF gradation adjustments
within 1 workday following the notification of acceptance test results.
448.03
Density.
Conduct density gauge quality control testing on the asphalt mat according to Supplement
1055 (S 1055). Conduct density gauge testing on uniform courses of
1.0 in (25mm) or more plan thickness. Conduct density gauge testing on
projects of two adjacent lanes or more and with at least one continuous mile
(1.6 kilometers) of paving (excepting bridges, intersections etc.).
When
Supplement
1055 density gauge testing is required, the requirements of 401.16, except the last four paragraphs, are
waived. The requirements of 401.13 do not
apply. However, rollers must fully and satisfactorily provide the
required compaction, be mechanically sound, and meet Hot Mix Asphalt industry
standards. The Department retains the right to reject the use of rollers
which are not in good repair, or are not designed to do the work required.
A three-wheel roller per 401.17 is not required.
448.04 Reports. Refer to Item 403
for reporting requirements of asphalt mixtures tested at the asphalt
plant. Report density gauge QC testing results according to S
1055.
448.05 Acceptance. Refer to Item 403
for acceptance requirements. If a project includes 448.03 Density, acceptance will include any density
deductions according to S
1055.04.
448.06 Basis of Payment. The
Department will pay for accepted quantities, completed in place, at the
contract prices, or at the contract price as modified in 448.05, as follows:
Item
Unit
Description
448
Cubic
Yard
Asphalt Concrete
(Cubic
Meter)
Intermediate Course, Type ___
448
Cubic
Yard
Asphalt Concrete Surface
(Cubic
Meter)
Course, Type ___