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Research and Development (R&D) Project Sites

Project Information
Project ID:   FHWA-PROJ-09-0035
Project Name:   Asphalt Pavement Embrittlement: Evaluating the Relationship Between Field and Lab Aging
Project Status:   Terminated
Start Date:  September 1, 2009
End Date:  August 31, 2012
Contact Information
Last Name:  Gibson
First Name:  Nelson H
Telephone:  202-493-3073
E-mail:  nelson.gibson@dot.gov
Office:   Office of Infrastructure Research and Development
Team:   Pavement Materials Team [HRDI-10]
Program:   Innovative Pavement Research and Deployment
Laboratory:   Binder Laboratory
Project detail
Roadmap/Focus area(s):   Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:   This activity seeks to provide tools for agencies to be able to take more active measures against flexible pavement deterioration rather than passively observing cracking distress before taking action. Both full-scale mixture tests and reduced scale mixture tests are to be applied from the current research knowledge. The type of full-scale tests that will be applied are those that can be used in mix design and/or acceptance tests. The full-scale tests balance practicality with more engineering significance of cracking and damage because they are to be able to be performed in the asphalt mix performance tester (formerly simple performance tester) but go beyond |E*| stiffness. One test is viscoelastic continuum damage push-pull that provides continuum crack initiation context, and the second test is a fracture mechanics crack propagation type test. These are in harmony with Federal Highway Administration research stakeholders. The small-scale tests focus on viscoelastic properties generated from the ubiquitous Bending Beam Rheometer. This thrust is geared more towards surrogates of the full-scale mix tests and maximize practicality by allowing field (throughout a pavement's life cycle) sampling of thinner layers. The mixture itself is tested without the cumbersome and expensive solvent extraction routines. Further, the small-scale test allows much greater flexibility and resolution in laboratory accelerated aging to be explored in three different candidates: long-term oven aging, pressure aging vessel, and Weatherometer. The greater resolution in simulated aging provides more data points to emulate the lifetime of a pavement.
Goals:   The key project objective is to develop laboratory test protocols for binders and mixtures with┬árecommended criteria to quantify remaining crack resistant life.
Product Type:   Draft standard, specifications, or guidelines
Research report
Expected Benefits:   The expected benefit is reduced maintenance and rehabilitation costs from improved preservation.
Deliverables: Name: Improved laboratory age conditioning (oxidation) of asphalt binder and mixtures.
Product Type(s): Research report, Draft standard, specifications, or guidelines
Description: Test protocol to measure the in situ aged fatigue life along with the mixture's binder properties to estimate the change in fatigue life relative to the original material properties and compute expected crack resistance life.
FHWA Topics:   Roads and Bridges--Pavement and Materials
TRT Terms:   Asphalt
Aging (Materials)
Fatigue Cracking
FHWA Disciplines:   Pavement and Materials
Subject Areas:   Pavements


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