SECTION 401
2.5.4 Whenever the aggregate properties change enough to negate the project’s existing design, a new design shall be
submitted.
2.5.5 Hf it becomes necessary to change the asphalt binder grade or the source of aggregate, a new mix design shall be
developed. Up to 14 calendar days will be required to evaluate a change. Approved changes in target values will not be applied
retroactively for acceptance or payment. If it becomes necessary to change the source of asphalt binder, the Contractor must
submit recent quality test results from the manufacturer for the asphalt binder including a temperature viscosity curve.
2.5.6 The Contractor shall perform a single point verification of an existing project mix design at the beginning of a new
construction season to determine if the design remains valid. If the design is validated, the data from the single point verification
shall be submitted to the Department. If the design cannot be validated, a new design shall be developed.
2.5.7. The Bureau of Materials and Research may require the use of certain chemical additives.
2.5.8 The laboratory performing the design shall be approved by the Department. To obtain the Department’s approval, a
laboratory must demonstrate that it is equipped, staffed, and managed so as to be able to produce job mix formulas and test hot
asphalt mix in accordance with these Specifications. Approval for each laboratory shall remain in effect for a period of one year.
2.6 Method Requirements.
2.6.1 Stockpiled coarse aggregate shall meet the requirements of Table 401-2.
Table 401-2 -- Percent Passing
: BaseMix ; Binder Mix | Wearing Mix Wearing Mix
Sieve Size LO" a Wr 3/8”
as ap pep
LL 1/4" i 90. 0 - 100 '
oP 50.0 88.0100 .
3/4 1 - 10.0 - 50.0 + 90.0-100° | :
pe oa en i007 cece
ee ee 950-100
Fe ee wt. 22.0-53.0
No. 8 © 0-50 0-50 ; 0 - 10.0
2.6.2 After the job mix formula (JMF) is established, all mixtures furnished for the project shall conform within the following
ranges of tolerances:
Passing No. 4 and larger sieves £7,0 percent
“Passing? No. 8 No. 100 sieves (inclusive) _ _£4.0 percent _ a
Passing No.” 200, sieve - tL,
“Asphalt binder i (sti‘C;;!!!!;C OA percent — —
Temperature of mixture E90 OF (ii °C)
2.6.3 When Non-compliant test results, or other conditions make it necessary, it shall be the responsibility of the Contractor to
make all adjustments required to ensure the mix conforms to the JMF.
If two consecutive non-compliant results occur, the Engineer may stop production until satisfactory corrective action has
been taken. A 5% reduction in unit price will be assessed to all tonnage represented by consecutive gradation failures and a 10%
reduction will be assessed to all tonnage represented by consecutive asphalt binder content failures. At the Engineer's discretion,
the Contractor may be required to remove non-compliant material (no payment will be made for this material or its removal).
Contractor quality control personnel will not be required to be on site during production of non-quality control projects, but
contract information shall be posted in the testing lab.
2.7 Performance Requirements (QC/QA).
2.7.1 After any new changed job mix formula is established, all mixtures furnished for the project shall conform thereto,
within the gradation and asphalt binder content reject limits in Table 401-6 in 3.17.3.1.1. Specification limits for pay adjustments
under Performance Requirements (QC/QA) provisions shall be as set forth in Table 401-5 in 3.17.3.1.1.
2016 NHDOT
Go To= TOC Division 100 Division 200 Division 300 Division 400 Standard
Division 500 = Division 600 Division 700 Specifications
