Detailed Exploration of the Locking Point Concept in Mix Design

The project will use x-ray computed tomography and mechanical performance tests to evaluate the manner in which aggregate particles pack during mix design to assess whether there is a point where aggregates no longer pack but simply move around. This will be compared to empirical definitions of locking point, which try to define the same thing. Then contemporary performance tests will be used to quantify the performance consequences for alternate mix design practices that attempt to increase binder content and durability without sacrificing permanent deformation (rutting resistance).

• Supplemental Notes:
  • Program Information: Surface Transportation Research, Pavement Materials Team

Language

• English

Project

• Status: Completed
• Contract Numbers:

  DTFH61-08-D-00001

• Sponsor Organizations:

  Federal Highway Administration

  Turner-Fairbank Highway Research Center
  McLean, VA  United States  22101
• Project Managers:

  Gibson, Nelson

• Performing Organizations:

  Federal Highway Administration

  Turner-Fairbank Highway Research Center
  McLean, VA  United States  22101
• Principal Investigators:

  Gibson, Nelson

• Start Date: 20090901
• Expected Completion Date: 0
• Actual Completion Date: 20130227

Subject/Index Terms

• TRT Terms: Aggregates; Binder content; Durability; Mechanics; Mix design; Rutting; Tomography
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01573574
• Record Type: Research project
• Source Agency: Department of Transportation
• Contract Numbers: DTFH61-08-D-00001
• Files: RIP, USDOT
• Created Date: Aug 25 2015 4:33PM