Rapid Tests and Specifications for Construction of Asphalt-Treated Cold Recycled Pavements

Pavement recycling offers significant economic and environmental benefits through reductions in material and energy consumption cost of construction and user delays. However, there are currently no universally agreed upon rapid process control and product acceptance test methods to ensure that the constructed materials comply with commonly specified parameters and are ready for traffic and surfacing. Asphalt-based recycling agents (foamed asphalt or emulsified asphalt) are used in the following pavement cold recycling processes: cold in-place recycling (CIR), cold central-plant recycling (CCPR), and full-depth reclamation (FDR). Cold recycled materials have traditionally been accepted on the basis of moisture content and compaction in the field and performance tests in the laboratory. These tests do not readily lend themselves to assessing the as-constructed quality and performance of cold recycled materials, nor do they help determine the proper time when traffic and surfacing can be applied without causing damage. Many agencies specify either a maximum moisture content or a mandatory curing period of 2 to 14 days before the recycled layer can accept surfacing. If the actual curing can be measured, significant construction delays may be avoided. Several state departments of transportation (DOTs) and some local government agencies have developed construction specifications for the various forms of cold recycling, which may vary widely from jurisdiction to jurisdiction. Therefore, a guide specification for process control and product acceptance of cold recycling operations is needed to promote consistency among agencies and allow contractors to more easily operate within multiple jurisdictions. Many existing cold recycling specifications are method-based and generally lack process control and product acceptance tests and criteria. Thus, research is also needed to develop appropriate time-critical tests, generally performed during construction, that allow an agency to quickly determine the quality of the as-constructed cold recycled pavement and evaluate its readiness for traffic and surfacing. The results of this project should lead to the future development of specifications aligned to a quality management approach. The objectives of this research are to develop (1) time-critical tests for asphalt-treated CIR, FDR, and CCPR materials and (2) a guide specification using these tests for process control and product acceptance that provides the agency with a basis for determining when the pavement can be opened to traffic and surfaced. Deliverables shall include, at a minimum: Phase 1 of the project will provide: 1. A critical review of the literature and a survey to identify current and emerging test methods for quality assessment of pavement materials and structural layers, including cold recycled asphalt pavement materials, and related specifications. At a minimum, the review shall consider product uniformity, moisture, compaction, and curing. 2. A technical memorandum that discusses time-critical tests proposed for development and validation in Phases II and III. 3. A detailed Phase II experimental design to develop and validate tests that are simple, practical, and provide time-critical results. The design shall identify potential field projects and agency and industry partners. 4. An interim report that presents (a) findings and conclusions of the critical review, (b the test methods proposed for development and validation in Phase II, and (c) the Phase II experimental design. Phase II of the project will provide: 1. Execution of the experiment approved in Phase I. 2. A suite of simple, practical tests in American Association of State Highway and Transportation Officials (AASHTO) standard format that provide time-critical properties and/or parameters for process control and product acceptance. 3. A draft guide specification in AASHTO standard format that incorporates the test methods as well as appropriate inspection methods. 4. A field experimental design to evaluate the guide specification in Phase III. Phase III of the project will provide: 1. Execution of the field experiment approved in Phase II. 2. A technical memorandum discussing lessons learned in the field evaluation. 3. The final proposed guide specification and test methods in AASHTO standard format. 4. Proposed tools for implementation of the guide specification and tests by agencies and industry. 5. A final report that documents results, summarizes findings, draws conclusions, and presents: (a) the proposed guide specification and tests in AASHTO standard format; (b) the technical memorandum on lessons learned in the field evaluation; and (c) the proposed tools for implementation of the guide specification and tests. Proposals have been received. The project panel will meet in late January to select a contractor to perform the work.


  • English


  • Status: Proposed
  • Contract Numbers:

    Project 09-62

  • Sponsor Organizations:

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Harrigan, Edward

  • Start Date: 20161211
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 41291

Subject/Index Terms

Filing Info

  • Accession Number: 01618755
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 09-62
  • Files: TRB, RiP
  • Created Date: Dec 11 2016 1:00AM