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Federal Highway Administration Research and Technology
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Research and Development (R&D) Project Sites

Project Information
Project ID:   FHWA-PROJ-10-0011
Project Name:   Full-Scale Aggregate Base Design and Construction
Project Status:   Active
Start Date:  March 1, 2010
End Date:  December 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:   Pavement Testing Facility
Project detail
Roadmap/Focus area(s):   Infrastructure Research and Technology Strategic Plan and Roadmap
Project Description:   This activity is aligned with the International Center for Aggregates Research and National Stone, Sand, and Gravel Association research priority list. The activity addresses the issue of using higher modulus, more dense bases construction for thinner asphalt concrete layers, thereby saving agencies money. This activity began to explore methods, which advance the state of the practice in granular base construction, material selection/specification, recycling and blending, and performance modeling. It has evolved with many attributes. Three main aspects are:  Alternative construction techniques.Pavement design structural configuration.Improved materials characterization and modeling.  Validation of the International Center for Aggregate Research cross-anisotropic resilient modulus material model for use in design and contributions to performance prediction is key.
Goals:   To evaluate the viability of the inverted pavement design to provide long-term performance with local materials.
Product Type:   Data
Draft standard, specifications, or guidelines
Research report
Partners:   Virginia Department of Transportation; Role(s): Other stakeholder
Expected Benefits:   Successful inverted pavements require both the performance and costs to be acceptable. Inverted pavements require more crushed stone, additional construction effort, and potentially less asphalt concrete, which reduces the overall pavement cost. A successful research project will lead to further steps towards implementation in the form of guidance for agency specifications or contractor practices.
Deliverables: Name: Materials, construction, and design guidelines for alternative inverted pavement structure.
Product Type(s): Research report, Data, Draft standard, specifications, or guidelines, Techbrief
Description: Research report documenting the laboratory materials characterization, construction specifications, and results in particular for the alternative high density aggregate base and performance. Performance will be documented in two manners: primary responses (stress, strain, deformation), and distresses (rutting and fatigue cracking).
Project Findings:   Initial findings must wait for the completion of construction to compare pavement primary responses from embedded instrumentation with those from external falling weight deflectometer. Ultimate findings must wait for the actual pavement performance to develop over time and accumulated traffic.
FHWA Topics:   Roads and Bridges--Pavement and Materials
TRT Terms:   Aggregates
Pavement Design
FHWA Disciplines:   Pavement and Materials
Subject Areas:   Design


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