Description of Requirement_Asphalt-01JUL21-1.pdf

DESCRIPTION OF REQUIREMENT

Hot Mix Asphalt

REQUIREMENT DESCRIPTION

The Airfields and Pavements Branch (APB) of the U.S. Army Engineer Research and Development Center (ERDC) in Vicksburg, MS, wishes to purchase asphalt surfacing material for the roadway test models.

Figure 1 shows the general location of material delivery at the US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS. The test model requires two different thicknesses of Commercial Surface Mix asphalt as shown in Figure 2. The first test model section is 150 feet long and 12 feet wide and will be surfaced with Commercial Surface Mix to a final compacted depth of 1.5 inches. The second test model section is also 150 feet long and 12 feet wide and will be surfaced with Commercial Surface Mix to a final compacted depth of 3 inches. For both sections, the base course material will be installed, compacted, and graded before asphalt is delivered.

• Work Items and Materials Provided by the Contractor:

1. At least five working days prior to paving of the asphalt test section, the contractor will supply a Job Mix Formula (JMF) for the proposed Commercial Surface asphalt material to be used on the project. The JMF will be reviewed by the Government Contracting Engineer and must be approved prior to start of paving. The JMF will meet the following requirements:

a. Combined Aggregate Gradation: The combined aggregate gradation will meet the requirements of the following table. The Commercial Surface Mix should contain 20% recycled asphalt pavement (RAP).

Nominal Maximum

Sieve Size 3/8 inch

Sieve Size Percent Passing ½ inch 100

3/8 inch 87 - 100 No. 4 54 - 80 No. 8 32 - 63 No. 16 No. 30 12 - 33 No. 50 6 - 20 No. 100 No. 200 2 - 10

b. Asphalt Binder Grade: An unmodified asphalt binder will be used that shall conform to requirements of AASHTO M320 for a PG 67-22 or conform to the requirements of AASHTO M 226 for an AC-30.

c. Asphalt Content: For this Commercial Surface Mix, the percentage of new asphalt added to the mix shall be between 4.5 and 5.5%. The total asphalt content, including contribution from the RAP, shall be between 5.5 and 6.5%.

2. The contractor will provide and deliver hot Commercial Surface Mix material to the job site meeting the JMF requirements. The Contractor shall provide the necessary equipment to spread, finish, and compact the asphalt test section. Production and placement equipment shall be in good working order and meet the applicable requirements of Section 401 of the latest edition of the Mississippi Department of Transportation (MDOT) Standard Specifications for Road and Bridge Construction.

Material will be delivered during normal working hours (6 am to 6 pm) on weekdays (Monday through Friday) unless extenuating circumstances require an alternate work schedule. Any alternate delivery schedule must be requested in writing at least 24 hours in advance and be approved by the Government Contracting Engineer.

DELIVERY

Delivery must occur within 60 days from date of award or a date agreed upon between the Government and contractor. Delivery dates/times will be coordinated with Government point of contact to ensure access to facility.

SAFETY

It is the responsibility of the contractor to ensure worker safety by informing the workers of any potential hazardous practices. Occupational Safety and Health Administration (OSHA) guidelines must be followed at all times for hazardous practices for handling and placing asphalt concrete.

Workers are required to be informed of all hazardous materials and practices that may involve exposure to toxic materials in the workplace. Material Safety Data Sheets (MSDS) must be available to all workers at the work site.

Figure 1. Paving Location at ERDC Low Volume Road Test Track.

Figure 2. Layout of Roadway Test Models (Not to Scale).

1.5 in thick asphalt 3.0 in. thick asphalt12 ft

150 ft 150 ft