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Project Information
Project ID:   FHWA-PROJ-12-0006
Project Name:   Application of Laser Shearography to Asphalt Issues
Project Status:   Active
Start Date:  October 1, 2012
End Date:  May 31, 2015
Contact Information
Last Name:  Youtcheff
First Name:  Jack
Telephone:  202-493-3090
E-mail:  jack.youtcheff@dot.gov
Office:   Office of Infrastructure Research and Development
Team:   Pavement Materials Team [HRDI-10]
Program:   Innovative Pavement Research and Deployment
Laboratory:   Pavement Testing Facility
Project detail
Roadmap/Focus area(s):   Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:   Develop quality assurance/quality control (QA/QC) testing equipment and methodology and develop test procedure(s) for conducting noncontact strain measurement at the pavement surface and of asphalt mixtures (cores).
Goals:   The key project objective is to apply the sensitivity of laser shearography in measuring shear deformations to the development of new test methods for asphalt binders, asphalt mixes, and pavements.
Background Information:   Current quality assurance/quality control (QA/QC) testing of asphalt binders is conducted long after the completion of the project. The Federal Highway Administration's (FHWA's) goal is to develop a rapid test procedure for conducting onsite QA/QC testing of the binder. An added advantage of this test is that the sample is not disturbed in its preparation for testing. This allows researchers to study steric and physical hardening phenomenon.  Current strain measurements of asphalt cores are conducted using strain gages. The goal is to develop a noncontact strain measurement of asphalt mixtures (cores). Current strain measurements of pavements are conducted using strain gages embedded in the pavement. The Federal Highway Administration's (FHWA's) goal is to develop a test procedure for conducting noncontact strain measurement of asphalt pavements.
Product Type:   Article
Draft standard, specifications, or guidelines
Research report
Test Methodology:   A prototype device is being developed. A diverse suite of modified and unmodified binders with known rheological master curves will be tested on this device. Responses from a quality assurance/quality control (QA/QC) test device will be compared with rheological data. The equipment will be modified to address any issues that might arise, and additional testing will be performed. Finite element modeling (FEM) will be concurrently conducted to validate this approach. A prototype device will be developed to measure minute deformations and possible crack formation of specimens subjected to push-pull testing. Modeling will be conducted such that the shear deformations can be related to strain measurements. The device developed will be used to evaluate the deflection basin at the Accelerated Load Facility (ALF) and assess deformations in the ALF pavement sections.
Expected Benefits:   The expected benefit is rapid verification of asphalt binder quality assurance/quality control (QA/QC).
Deliverables:   The deliverable is a rapid test procedure for evaluating asphalt binders in a sample tin.
FHWA Topics:   Research/Technologies--Turner-Fairbank Highway Research Center (TFHRC)
TRT Terms:   Quality Assurance
Asphalt Mixtures
FHWA Disciplines:   Pavement and Materials
Subject Areas:   Maintenance and Preservation


Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000
Turner-Fairbank Highway Research Center | 6300 Georgetown Pike | McLean, VA | 22101