80GSFC20B0002 Attachment H revised 9-8-20.pdf
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- Solicitation number
- 80GSFC20B0002
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This document provides specifications and clarifications for the Airfield Repair Project, FCLP Phase 7 solicitation issued by NASA Goddard Space Flight Center. Key requirements include repair of pavement spalls at Wallops Flight Facility not exceeding 1 inch depth, placement of joint sealant flush with the pavement surface to minimize foreign object debris, use of a rubber tire roller on pavement to concrete joints, compaction of hot mix asphalt within 2 hours of mixing and meeting minimum temperature requirements for placement, ensuring air voids in placed cores are less than 6%, use of a material transfer vehicle to reheat and remix hot mix asphalt, and removal of overly segregated pavement surfaces. Active utilities are to be adjusted to final grades while abandoned utilities are to be removed to the milled depth and voids grouted before paving.
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ATTACHMENT H
80GSFC20B0002
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
GODDARD SPACE FLIGHT CENTER
WALLOPS FLIGHT FACILITY
WALLOPS ISLAND, VA 23337
WALLOPS AIRFIELD REPAIR PROJECT, FCLP PHASE 7
SPECIFICATION/DRAWING SUPPLEMENTAL CLARIFICATION
Wallops Airfield Repair Project, FCLP Phase 7
LOCATED
AT
NASA GSFC/WALLOPS FLIGHT FACILITY
WALLOPS ISLAND, VIRGINIA
Date: September 8, 2020
Wallops Airfield Repair Project, FCLP Phase 7 Specification/Drawing Supplemental Clarification
September 8, 2020
No wire brush sweepers can be operated for the project.
Contractor shall ensure stability of closure markings and ensure sandbags/etc. used to weight them down are replaced as necessary to avoid FOD hazards on the runway.
Transverse straight edge testing (smoothness requirements) shall be performed within 24 hours of the placement of a lane and shall apply to the lane, across the joints, and longitudinal transition from existing pavement to new pavement.
The QC Manager and SSHO/Superintendent cannot be the same person. The QC Manager and SSHO/Superintendent are both full time required positions for this project, if either is not present then all work shall stop until the project is properly manned. The QC Manager and SSHO shall both have at least 5 years of experience working on similar size and scope and Airfield Pavement Projects to be acceptable.
Sheet CS501 Detail A Overcutting of PCC shall not exceed 1” per spall repair notes on CS501.
Sheet CS501 Detail F, G, H, J The final elevation of the joint sealant shall be 1/8” from surface to minimize FOD.
Hot Mix Asphalt Airfield Paving -JMF shall state the minimum placement temperature of HMA.
-Production pavement cannot begin until all tests are back and approved for the test strip. The equipment and workers that place the test strip MUST be the same workers and equipment that applies production pavement.
-All test, reports, certifications, invoices, control charts, etc must be reviewed and approved by the QC prior to submittal to the Government for acceptance.
-Lab must be located at the batch plant.
-HMA specimen must be compacted and tested within 2 hours of mixing and prior to HMA bulk production (no reheat allowed on HMA production specimen).
-HMA must be in place 3 hours or less from the plant (for uninsulated trucks) and must meet minimum temperature requirements or cannot be placed and cannot be recycled, must be discarded offsite.
-JMF should be designed for a TMD of 4% air void and the in place cores should have actual air voids less than 6% to be acceptable.
-Testing lab must be certified per ASTM D3666
-JMF test must be less than 6 months old
-PG 70-22 binder should exceed 5% and may be as high as 7% to provide a properly consolidated matt
-Crushed aggregate should have more than 75% that have 2 or more fractured faces
-No RAP allowed in surface
-No more than 3 passes are allowed on the matt with a vibratory roller (additional passes can be made with vibration turned off), this should be established with the approved roller pattern established during the test strip
-Must use an oscillatory vibratory roller on joints
-Must use a rubber tire roller on PCC to HMA joints
-Must mark each lot and core location in the field for Government verification
-Required Material Transfer Vehicle must reheat and remix HMA and be self-propelled with an articulated arm
-If batch plant is located onsite, Contractor must ensure that plant meets all safety requirements, labeled panels, containment berms, spill protection kits, fire extinguishers, first aid kits, handrails on elevated platforms, confined space signage, etc.
-Must cut back longitudinal joints by 3” minimum if temperature is below 175F before next matt placement. Or can trim and reheat edge if approved
-No tack balls or tracking of tack is allowed on subgrade or on new HMA matt or on existing station infrastructure, can use trackless tack.
-Overly segregated surface will be rejected and must be removed and repaved, overly segregated surface promotes premature failure due to freeze and thaw and creates a FOD hazard on an Airfield, Airfield segregation does not ‘heal’.
G-003 General Notes, addition to #3
a. Several abandoned utilities were located upon site visit that were not in the specs and drawings:
Utilities to be Abandoned Include Sewer Clean Out, Runway Lamp, and Electric Vault Remove existing structure to milled depth. Grout voids and pave.
b. For Active Utilities
(1) For existing sewer clean out and water cut off valve, adjust elevation of utilities as required to match proposed grades.
(2) For the existing electric vault, the structure is to remain at current elevation.
Adjust paving to match grade at structure edges.
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