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ACPA Pavement Research Update. Presented to: FAA Pavement Working Group April 26, 2012 Gary L. Mitchell, P.E. Vice President Airports and Pavement Technology. ACPA Pavement Research . Conducted by Innovative Pavement Research Foundation Cooperative Agreement 01-G-002

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acpa pavement research update

ACPA Pavement Research Update

Presented to: FAA Pavement Working Group

April 26, 2012

Gary L. Mitchell, P.E.

Vice President

Airports and Pavement Technology

acpa pavement research
ACPA Pavement Research
  • Conducted by Innovative Pavement Research Foundation
  • Cooperative Agreement 01-G-002
  • Funded from 2001 until 2006
  • Grant closed out in October 2011
iprf program status
IPRF Program Status
  • Over 30 projects – reports on the IPRF website.
  • Research funded to date over $12.99 million
  • Program closed out October, 2011.
  • At least six FAA documents have been revised as a direct result of the IPRF research projects
  • IPRF still exist – limited funds
faa documents updated
FAA Documents Updated
  • Engineering Brief Number 70:  ASR in Portland cement concrete pavements exposed to runway deicing chemicals
  • Advisory Circular 150/5320-6E – Airport Pavement Design and Evaluation
  • Advisory Circular 150/5370-10D – Standards for Specifying Construction of Airports (four standards within this AC)
    • Item P-304, Cement Treated Base
    • Item P-306, Econocrete Base Course
    • Item P-501, Portland Cement Concrete Pavement
    • Item P-219, Recycled Concrete Base Course
  • First Report – Best Practices Manual
  • ACPA published and update in 2011

Canceled

iprf research on durability of concrete pavements at airports summary of what we have learned
IPRF Research on Durability of Concrete Pavements at Airports - Summary of what we have learned -
  • Concrete pavements can provide a long-lasting pavement surface for airports, provided they are designed and constructed per specifications.
  • Implementation of specifications has been an issue (IPRF 05-7).
  • Durability problems in pavements were avoidable
  • The predominant reason for the ASR in the pavements
    • lack of adequate implementation of existing specifications (in case of newer pavements) and
    • lack of adequate specifications (in case of older pavements).
  • Deicers,
    • Possibly capable of triggering ASR (lab)
    • Do not appear to be the primary reason for the ASR in the field
      • inability to penetrate deeper into concrete
      • results only in near surface impact.
  • FAA Engineering Brief 70 was ineffective and flawed – result: canceled
iprf research on durability of concrete pavements at airports summary of what we have learned1
IPRF Research on Durability of Concrete Pavements at Airports - Summary of what we have learned -
  • Concentration of accumulated deicer in the near surface region of concrete can have more significant impact on the freeze-thaw durability of pavements rather than ASR.
  • Laboratory studies showed
    • Concrete subjected to freeze-thaw test in the presence of deicers failed
    • Presence of water performed significantly better.
  • Research need exists to determine the mechanism of freeze-thaw failure in the presence of deicers, and how and why traditional air-entrainment may be lacking in offering adequate protection.

F-T Test on Concrete Core

in Presence of KAc Deicer

Deterioration of Concrete Pavement

Subjected to KAc Deicer

F-T Test of Concrete Core

in Presence of Water

research needs
Research Needs

F-T Durability

  • The impact of airfield pavement deicers on freeze-thaw durability of concrete needs to be investigated.
  • The effectiveness of existing air-entraining agents in protecting concrete against the effects of freeze-thaw durability needs to be investigated.

Stability of Hydrated Cement Paste

  • Impact of KAc deicer on stability of certain hydrated cement paste compounds has been identified to be another important durability mechanism.
  • Detailed studies have not yet been conducted.
  • Research need exists in determining the impact of interactions between deicer solutions and hydration products on other durability issues such as F-T and Shrinkage characteristics of concrete.
slide8

Please contact Gary L. Mitchell

with questions or comments:

gmitchell@ACPA.org