6.3        Pavement Design

6.3.1            Airfield Pavement Design

A.     The preferred pavement mixes used on the airside shall be the following:

B.     The design and construction of all Martin State (MTN) Airport projects shall include the requirement of placing an additional layer of AASHTO #3 Stone under the design pavement section. The AASHTO #3 stone shall not be considered part of the structural pavement. Due to the excessive amount of unsuitable material located at MTN, MDOT MAA requires the consultant place a minimum of 12” of AASHTO #3 Stone and filter fabric over the entire paved area. The unsuitable material shall be removed and backfilled as determined by the engineer. AASHTO #3 Stone shall then be placed at a depth determined by the engineer prior to the placement of the subbase material. In addition, the engineer shall require filter fabric to be placed below and above the section of AASHTO #3. Refer to exhibit on the following page titled “MARTIN STATE AIRPORT SECTION” dated April 2005.

C.      Subbase and Base Course: Cement Treated Base Course materials shall not be used in the design and construction of flexible pavements in projects at BWI Marshall or Martin State Airports.

6.3.1.1          Federal Aviation Administration (FAA) Specification Incentives

There are no incentive payments for either Specification P-401 or Specification P-501.

6.3.2            Landside Pavement Design

The preferred pavement mixes used on the landside shall be from this list:

·        9.5 mm PG 64-22 Level 2

·        9.5 mm PG 64-22 Level 2 HPV

·        9.5 mm PG 64-22 Level 4

·        9.5 mm PG 64-22 Level 4 HPV

·        9.5 mm PG 76-22 Level 4

·        9.5 mm PG 76-22 Level 4 HPV

·        9.5 mm PG 76-22 Level 4 GAP

·        12.5 mm PG 64-22 Level 2

·        12.5 mm PG 64-22 Level 2 HPV

·        12.5 mm PG 64-22 Level 4

·        12.5 mm PG 64-22 Level 4 HPV

·        12.5 mm PG 76-22 Level 4

·        12.5 mm PG 76-22 Level 4 HPV

·        12.5 mm PG 76-22 Level 4 GAP

·        19.0 mm PG 64-22 level 2

·        19.0 mm PG 64-22 Level 4

·        25.0 mm PG 64-22 Level 2

·        25.0 mm PG 64-22 level 4