Development of In-Place Density Method for Cold In-Place Recycling

Typically, in-place compaction of asphalt bound layers is controlled through the measurement of the density of the compacted mat and the calculation of in-place air voids. In the case of hot-mix asphalt (HMA), a combination of cores and nuclear density gauge is used to determine the in-place density of the compacted mat following well-established American Association of State Highway and Transportation Officials (AASHTO) and Agency’s procedures. The implementation of the same procedures for cold in-place recycling (CIR) faces serious limitations due to: (1) the inability of cutting cores from the CIR mat until full curing of the CIR mix has occurred which requires 10-14 days; and (2) the ineffectiveness of the nuclear density gauge during the compaction process because of the high moisture content of the CIR mix. The above limitations have led to the construction of CIR projects without the effective control of in-place compaction. Hence, the overall objective of this research project is to develop a practical method to measure the in-place density of the CIR layer during the construction and compaction process. First, the possible methodologies that can be used for directly or indirectly measuring the in-place density of CIR layer will be identified. Second, the promising technologies will be evaluated in the laboratory. Finally, the laboratory-validated method will be implemented on field projects and guidelines will be developed for inclusion in construction specifications.

Language

• English

Project

• Status: Completed
• Funding: $101271
• Sponsor Organizations:

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  University of Nevada, Reno

  College of Engineering
  Reno, NV  United States  89557
• Performing Organizations:

  University of Nevada, Reno

  College of Engineering
  Reno, NV  United States  89557
• Principal Investigators:

  Sebaaly, Peter

• Start Date: 20160301
• Expected Completion Date: 20180930
• Actual Completion Date: 20180131

Subject/Index Terms

• TRT Terms: Air voids; Asphalt pavements; Cold in-place recycling; Compaction; Curing agents; Hot mix asphalt; Nuclear density gages; Recycled materials
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01595997
• Record Type: Research project
• Source Agency: Center for Advanced Transportation Education and Research (CATER)
• Files: UTC, RIP
• Created Date: Apr 13 2016 11:47AM