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Geotextile Separation Layer for Aggregate Base Courses

Project Information

Project ID: 
Project Status: 
Temporarily Suspended
Start Date: 
Thursday, October 1, 2009
End Date: 
Monday, December 31, 2012
FHWA Program: 
FHWA Subprogram: 
Pavement and Materials
TRT Terms: 
Geosynthetics; Granular Bases; Separation; Infrastructure; Materials; Research; Pavements Highways
FHWA Discipline: 
Pavement and Materials
Subject Area: 
Pavements, Materials, Research

Contact Information

First Name: 
Last Name: 
(202) 493-3090
Email Address: 
Infrastructure Materials Team
Office of Infrastructure Research and Development
Office Code: 

Project Details

Project Description: 

The motivation for this research activity is to protect lower volume roads which may become higher volume roads and experience increased truck traffic loads and volumes.  The Accelerated Pavement Testing Facility at present cannot be used for such testing due to concerns with disturbing the site and adversely impacting existing Accelerated Pavement Testing experiments. Test pits are available with loading frames for conducting this research. The test pits are very attractive due to their large size, ability to instrument the site, and, more importantly, the ability to control saturation and water table level. Proposed is the development of a very low-cost repeated loading system to quantify performance and cost benefits from using a geotextile as a separation layer to keep subgrade fines and a high quality granular base from migrating and contaminating. The test pits would afford the opportunity to have a more robust research program than using the Accelerated Pavement Testing Facility, as more material and variable thickness can be readily constructed and tested.


This project will gather saturated and unsaturated full-scale performance properties with and without separators to define particular changes in engineering properties for performance simulations to develop life-cycle cost analyses.