Use of Lasers for Laboratory Measurements of Aggregate Shape, Angularity, and Texture

Aggregate shape, texture, and angularity are considered crucial for the development of high quality adhesive systems with asphalt binder, and a good quality aggregate skeleton in asphalt and concrete mixtures. These properties are currently measured using the aggregate image measurement system (AIMS), which is based on analyzing images of aggregate samples taken with a digital camera to determine aggregate shape, angularity, and texture. Texas Department of Transportation (TxDOT) owns and operates the current camera-based imaging system. However, the current system may provide misleading results when scanning aggregates of dissimilar surface color. This shortcoming is significant because it may lead to erroneous rankings of materials. In practice, texture measurements are commonly made using lasers for in-service pavements, and for specimens compacted in the laboratory or taken from field sections. Indeed, specifications used in practice to measure texture are based on laser measurements. There is a need to investigate the application of these optical sensors for measuring aggregate profiles to determine shape, angularity, and texture, and to compare these measurements with those from the AIMS and from other advanced scanning techniques to improve the current image analysis method.

• Record URL:
  http://library.ctr.utexas.edu/Presto/content/Detail.aspx?ctID=M2UxNzg5YmEtYzMyZS00ZjBlLWIyODctYzljMzQ3ZmVmOWFl&rID=NTIx&sID=MQ==&qrs=VHJ1ZQ==&q=KHJwLlN0YXJ0RGF0ZT1bMjAxNTAxMDEwMDAwMDAgVE8gMjAxNjEyMzEwMDAwMDBdKQ==&qcf=M2UxNzg5YmEtYzMyZS00ZjBlLWIyODctYzljMzQ3ZmVmOWFl

Language

• English

Project

• Status: Completed
• Funding: $671,011
• Contract Numbers:

  0-6921

• Sponsor Organizations:

  Texas Department of Transportation

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

  Adams, Joe

• Performing Organizations:

  University of Texas, Arlington

  P.O. Box 4089
  Arlington, TX  United States  76010

  Texas A&M Transportation Institute

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

  Walker, Roger

• Start Date: 20160101
• Expected Completion Date: 20171231
• Actual Completion Date: 0

Subject/Index Terms

• TRT Terms: Aggregate gradation; Aggregates; Angularity; Binders; Digital cameras; Lasers; Shape; Texture
• Identifier Terms: Texas Department of Transportation
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01618965
• Record Type: Research project
• Source Agency: Texas Department of Transportation
• Contract Numbers: 0-6921
• Files: RiP, STATEDOT
• Created Date: Dec 20 2016 12:49PM