U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| 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 Hardware 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) during pavement production. Approach is to be applicable to all asphalt binders whether neat, modified or containing ground tire rubber. | |
| Deliverables: | 1. Name: Asphalt binder quality assurance/quality control (QA/QC) equipment and test. Product Type(s): Research report, Hardware, Draft standard, specifications, or guidelines Description: The deliverable is a rapid test procedure for evaluating all asphalt binders in a sample tin. 2. Name: Noncontact displacement measurement of asphalt cores and pavements. Product Type(s): Research report, Hardware, Article Description: The deliverable is a test procedure for conducting noncontact strain measurement at the pavement surface and of asphalt mixtures (cores). | |
| FHWA Topics: | Research/Technologies--Turner-Fairbank Highway Research Center (TFHRC) | |
| TRT Terms: | Quality Assurance Asphalt Binders Infrastructure Pavements Research Asphalt Mixtures |
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| FHWA Disciplines: | Pavement and Materials |
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| Subject Areas: | Maintenance and Preservation Materials Research |
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