Methods of Rehabilitating Pavements with Moisture Damaged Asphalt Layers

Texas has many miles of major flexible highways where a severely moisture damaged (stripped) asphalt layer exists at some depth beneath the surface. It is not unusual to have 4 inches of good hot mix asphalt (HMA) over 2 inches of stripped pea-gravel over several inches of good HMA. These stripped layers lead to surface cracking and greatly reduce the life of any new asphalt overlay. To permanently repair these problem sections, the conventional wisdom is to mill down to the solid HMA and then come back with full depth HMA. This is costly and means that several inches of good materials will be sent to reclaimed asphalt pavement (RAP) stockpiles rather than being recycled and reused. However, recent developments in cold in-place recycling (CIR) and cold central-plant recycling (CCPR) can be considered for addressing this stripping problem while recycling 100% of the existing HMA and placing it as a structurally sound black base layer. Recently, the Virginia Department of Transportation (DOT) reported success with this approach on a distressed section of IH 81. In that case, they used a combination of both cement and foamed asphalt to reclaim a deteriorated HMA layer. After 4 years in service, that section is performing excellently under very heavy traffic. This project will conduct a laboratory and design study to determine if either CIR or CCPR techniques shall be considered to recycle HMA layers containing severely stripped layer in Texas. This project will also determine and analyze the engineering properties of reclaimed layers to determine what level of traffic they can handle. If successful, guidelines and plans shall be developed to construct monitor sections in Texas.

Language

  • English

Project

  • Status: Active
  • Funding: $444825
  • Contract Numbers:

    0-6926

  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Badgley, Sonya

  • Performing Organizations:

    Texas A&M Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135
  • Principal Investigators:

    Sebesta, Stephen

  • Start Date: 20160830
  • Expected Completion Date: 20180831
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01626193
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6926
  • Files: RiP, STATEDOT
  • Created Date: Feb 17 2017 11:57AM