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SECTION 1028 -- SUPERPAVE ASPHALTIC CONCRETE

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SECTION 1028 -- SUPERPAVE ASPHALTIC CONCRETE
1028.01 -- Description

1. a. Superpave Asphaltic Concrete is a Contractor-designed mix.


b. The Contractor will be required to define properties using a
gyratory compactor that has met the Superpave evaluation test procedures,
during mix design and production.
2. a. Before production of asphaltic concrete, the Contractor shall
submit, in writing, a tentative job mix formula for approval to the NDR Flexible
Pavement Engineer at the Lincoln, Nebraska Central Laboratory.


b. The job mix formula shall identify the mineral aggregates and
mineral filler, if needed, with the value of the percent passing each specified
sieve for the individual and blended materials.


c. (1) The Contractor shall submit 6 gyratory pucks prepared for
moisture susceptibility and 3 proportioned 20 lb. (10,000-gram) samples of the
blended mineral aggregates to be used in the mixture to the NDR Materials
and Research Central Laboratory at least 10 NDR working days before
production of asphaltic concrete. These samples will be used to correlate the
Contractors Superpave mix design test results.
(2) Submitted with these samples shall be a copy of the
Contractors results for all Superpave mix design tests.



(3) This mix design shall include at a minimum:




(i) The bulk specific gravity of the blended aggregate. (The
bulk specific gravity shall be determined from an unwashed sample.)
(ii)
The
target
binder
content.




(iii) The supplier and grade of PG Binder.




(iv) The maximum specific gravity of the combined mixture
(Rice).




(v) The average bulk specific gravity and air voids at N initial
(Nini), N design (Ndes) and N maximum (Nmax) of the compacted gyratory
specimens.




(vi) Voids in the Mineral Aggregate (VMA) and Voids Filled
with Asphalt (VFA) at Ndes.
(vii)
Fine
Aggregate
Angularity
(FAA),
Coarse
Aggregate
Angularity (CAA), Flat and Elongated Particles and Clay Content of the
aggregate blend.
(viii) Location
description
and/or
legal
descriptions
and
producers of materials used in the mix.


d. Before the mix design is approved, the Materials and Research
Laboratory shall verify all properties.
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3. PG Binder in Recycled Asphalt Pavement:
a. The Contractor may approach the State with a proposal to
supplement the virgin aggregates of the asphaltic concrete mix with a
Contractors specified percentage of recycled asphalt pavement (RAP). The
State may accept or reject the proposal based on whether the mix design
meets the specified criteria of the asphaltic concrete proposed. The RAP may
come from the project or an existing stockpile. The Contractor is responsible
for investigating the quality and quantity of the RAP material.


b. In recycled asphaltic concrete mixtures, the allowable maximum
percent of Reclaimed Asphalt Pavement (RAP) will be as shown in Table
1028.01. If the Contractor elects to exceed these values, the Contractor will be
required to lower the minimum pavement design temperature of the PG
Binder, one grade, according to AASHTO MP1.
Table 1028.01
Asphaltic Concrete Type
Percent, Maximum RAP
SPS 50
SP0 45
SP1 35
SP2 25
SP3 25
SP4 15
SP5 15

4. Quality Control Program:


a. The Contractor shall establish, provide, and maintain an effective
Quality Control(QC) Program. The QC Program shall detail the methods and
procedures that will be taken to assure that all materials and completed
construction conforms to all contract requirements.
b. Although guidelines are established and certain minimum
requirements are specified herein and elsewhere in the contract, the
Contractor shall assume full responsibility for placing a pavement course that
meets the target field values.


c. The Contractor shall establish a necessary level of control that will:



(1) Adequately provide for the production of acceptable quality
materials.



(2) Provide sufficient information to assure both the Contractor
and the Engineer that the specification requirements can be met.
(3) Allow the Contractor as much latitude as possible in
developing control standards.


d. (1) The Contractor shall develop and provide the Engineer a copy
of the QC Program no less than 10 NDR working days prior to the
preconstruction conference or no less than 10 NDR working days prior to
beginning production of project materials.
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(2) The Contractor shall not begin any construction or production
of materials until the Engineer has approved the QC Program.


e. The QC Program shall address, as a minimum, the following
items:
(1)
QC
organization
chart.
(2)
The
mix
design.
(3)
Submittals
schedule.
(4)
Inspection
requirements.
(i)
Equipment.
(ii)
Asphalt
concrete
production.
(iii)
Asphalt
concrete
placement.
(5)
QC
testing
plan.
(6)
Documentation
of
QC
activities.
(7) Requirements for corrective action when QC and/or
acceptance criteria are not met.



(8) Any additional elements deemed necessary.



(9) A list, with the name and manufacturers model number, for all
test equipment used during laboratory testing.



(10) A description of maintenance and calibration procedures,
including the frequency that the procedures are performed.


f. The QC organization chart shall consist of the following personnel:
(1)
A
Program
Administrator:




(i) The Program Administrator shall be a full-time employee
of the Contractor or a Subcontractor (Consultant) hired by the Contractor.




(ii) The Program Administrator shall have a minimum of
5 years experience in highway construction.




(iii) The Program Administrator need not be on the job site at
all times but shall have full authority to institute any and all actions necessary
for the successful implementation of the QC Program.
(iv)
The
Program
Administrator's
quali-fications
and
training
shall be described in the QC Program.



(2) One or more Quality Control Technicians:




(i) The quality control technicians shall report directly to the
Program Administrator and shall perform all quality control tests as required by
the contract.
(ii) The QC technicians shall be certified by the NDR
Materials and Research Division.
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(iii) Certification at an equivalent level by a state or nationally
recognized organization may be acceptable.




(iv) The QC technician's credentials and NDR training records
shall be submitted to the NDR Materials and Research Division.
(v) The Contractor may have a non-certified technician
working under the direct supervision of a certified technician for no more than
one construction season.


g. (1) Inspections shall be performed daily to ensure continuing
compliance with contract requirements until completion of the work.



(2) QC test results and periodic inspections shall be used to
ensure the mix quality and to adjust and control mix proportioning.
h.
QC
Testing
Plan:



(1) The testing plan shall include the NDR statistically based
procedure of random sampling for acquiring test samples.



(2) The Contractor may add any tests necessary to adequately
control production.



(3) All QC test results shall be documented by the Contractor with
a copy provided to the Engineer within 1 week after the tests are complete.
Daily review by the Engineer will be allowed if requested.



(4) Copies of all forms to be used shall be included in the QC
Testing Plan.
i. Corrective
Action
Requirements:
(1) The Contractor shall establish and utilize QC charts for
individual QC tests. The requirements for corrective action shall be linked to
the control charts.



(2) The Contractor's QC Program shall detail how the results of
QC inspections and tests will be used to determine the need for corrective
action.



(3) (i) A clear set of rules to determine when a process is out of
control and the type of correction to be taken to regain process control will be
provided.




(ii) As a minimum, the plan shall address the corrective
actions that will be taken when measurements of the following items or
conditions approach the specification limits:
(I)
Plant
produced
mix
grada-tions
at
laydown.
(II)
Binder
content.
(III)
Air
voids.
(IV)
VMA





(V) VFA
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(VI)
FAA AASHTO
T
304
CAA ASTM
D
5821




(iii) Corrective actions that will be taken when the following
conditions occur:





(I) Rutting
(II)
Segregation
(III)
Surface
voids
1028.02 -- Material Characteristics

1. The type of PG Binder shall be shown in the plans or special
provisions.
2.
Aggregates:


a. Aggregates for use in superpave asphaltic concrete shall be tested
on an individual basis.


b. With the exception of Asphaltic Concrete Type SPS the blended
mine