Proposals Due November 9, 2007
Non Destructive Testing to Identify Delamination of HMA Airport Pavements
One of the more serious problems that can occur on HMA airfield pavements is the delamination of hot mix asphalt (HMA). Several instances have been documented where pavements that have not previously been identified as having delamination problems have experienced significant damage when subjected to an application of jet blast or other horizontal loading from an aircraft. The presence of undetected delamination and/or discontinuities in asphalt pavement also provides paths for moisture damage and development of other distresses such as foreign object debris (FOD), slippage cracks, pavement deformation and reduction in pavement strength. The types of distress associated with delamination typically require the need for continual maintenance until major corrective actions are taken. A rapid nondestructive test method is needed to determine the existence and extent of delamination and/or discontinuities in asphalt pavements.
The objective of this study is to provide a comprehensive procedure and guidance to identify the presence and extent of HMA delamination in airport pavements. The procedures developed in this study shall concentrate on the capability of identifying delamination and discontinuities within the upper 5 inches of the asphalt pavement but not be limited to the upper 5 inches. The selected contractor shall investigate common conditions of past instances of major damage to airport HMA pavements resulting from delamination and determine key indicators that may be used to identify potential areas of delamination. In addition, the contractor shall identify existing non-destructive test (NDT) procedures and/or equipment that have been used to address the problem and determine if these methods, modifications of these methods, or new methods should be pursued to provide a rapid, effective way to determine if pavements have delamination and present a risk of significant damaged by jet blasts or other aircraft operations. Although the causes for delamination and discontinuities of asphalt pavement are important, no significant time is expected to be devoted to that element in this project. The main objective of this study is to identify and develop non-destructive procedures that are capable of locating areas of delamination and discontinuities.
This study is divided into two phases. Phase I will consist of a literature review of the historical records of pavement delamination failures from jet blasts, methods presently used to identify delamination and discontinuities, assessment of the applicability and effectiveness for use in airfield pavements, and proposal of a comprehensive study/experimental plan to validate recommended approaches. Phase II shall consist of modifications, if needed, to the recommended procedures/equipment and conducting experiments to verify that the procedure is applicable to airfield HMA pavements.
Specific conditions for airfield pavements that should be considered are:
The products for this project shall consistent of: (1) comprehensive review and documentation of existing procedures and equipment used for identifying delamination and discontinuities in HMA pavements; (2) development and documentation of a rapid, economical test to be used to determine the presence of delamination of HMA pavements; and (3) documented field verification of recommended non-destructive testing procedures/equipment. These products shall be developed by addressing the following tasks:
Task 1 -- Literature search of case histories of instances where jet blast damage to asphalt pavements has been exacerbated by delamination. The search shall include a review of existing methods and equipment used to identify delamination and summary of common causes for delamination damage and distress present before the jet blast damage occurred.
Task 2 -- Assessment of the potential use of existing NDT methods for airfield HMA pavements application. The result of this task shall be a comprehensive table of existing methods and equipment used for identifying the presence of discontinuities and delamination in asphalt pavements. The table shall contain but not be limited to the following items:
Task 4 -- Develop a work plan for field verification of test methods and equipment.
Task 5 -- Provide a report outlining findings to date and proposed future actions for this research. The report is expected to be presented to the technical panel at a mutually agreed upon location approximately 6 months after award. The purpose of this meeting is for the technical panel to provide comments and direction on the completion of Phase I and approval for work to be conducted in Phase II.
Task 6 -- Upon approval of the Phase II work plan by the technical panel, conduct laboratory/field testing as indicated in the work plan.
Task 7 -- Provide draft final report for panel review and comments. The final report shall contain all products to be delivered under this study. The technical panel will provide comments within one (1) month after receiving drafts.
Task 8 -- Make revisions to the draft final report and other documents per panel comments. Provide the final report and recommended NDT test protocol. Submit camera ready copy of the final documents and an electronic copy in press quality PDF format.
All written documentation will be prepared using Microsoft Word unless otherwise stated. All reports will be the property of the AAPTP and Auburn University and will be supplied in a format that complies with the FAA's Section 508 requirements for electronic documents.
Proposal Evaluation Criteria
The deliverable products for this project shall include:
Quarterly progress reports (one hard copy and an electronic copy in Microsoft Word format) are required from the research agency and are to be prepared on the basis of calendar quarters. The research agency will mail the report directly to the AAPTP and will e-mail each of the members of the technical review panel a copy of the progress report. Each report will include a cover letter and the following:
The formats for the Interim and Final reports are provided under "Research Process."
Funds Available: $190,000
Contract Time: 18 months (includes 1 month for AAPTP to review and for the contractor to revise the final report.)
Staff Responsibility: Monte Symons, 334-844-4964, firstname.lastname@example.org
Proposals Due: November 9, 2007
Submit Proposals To: AAPTP, 277 Technology Parkway, Auburn, AL, 36830
Authorization to Begin Work: January 2, 2008 -- estimated
Maintained by Linda Kerr