USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation
OFFICE OF RESEARCH, DEVELOPMENT, AND TECHNOLOGY AT THE TURNER-FAIRBANK HIGHWAY RESEARCH CENTER

Variability in the Engineering Properties of Open-Graded Aggregate Backfills

Publication Information

Publication Type:
Summary Report
Publication Number:
FHWA-HRT-23-046
Abstract:

Open-graded aggregates (OGAs) are a common civil engineering material used in the construction of roads and bridges. Their unit weight and shear strength are important parameters that transportation agencies must consider during design, yet little is known about the variability of those parameters. To address this gap, the Federal Highway Administration initiated a round-robin study in which six laboratories tested three commonly used OGAs from five different quarries for gradation, density, and shear strength using large-scale direct shear devices.


This report presents and analyzes the results from this interlaboratory study and discusses the sensitivity of the physical and mechanical parameters for OGAs. The results of this study should assist State and local transportation agencies, design consultants, contractors, and researchers in determining appropriate design parameters and understanding their reliability.

 


 

Recommended citation: Federal Highway Administration, Variability in the Engineering Properties of Open-Graded Aggregate Backfills: A Large-Scale Direct Shear Round-Robin Study (Washington, DC: 2023) https://doi.org/10.21949/1521990

Publishing Date:
July 2023
Posting Date:
Digital Object Identifier:
https://doi.org/10.21949/1521990
Author(s):
Nicks, Jennifer
Adams, Michael
Culbreth , Nicholas (ORCID: 0000-0003-0434-230X)
Gebrenegus, Thomas (ORCID: 0000-0002-5742-6411)
Publishing Office:
Office of Infrastructure Research and Development
FHWA Program(s):
Research
Infrastructure
AMRP Program(s):
Structures
Pavements and Materials
FHWA Activities:
Long-Term Bridge Performance
Long-Term Pavement Performance
Subject Area:
Research
Bridges and other structures
Pavements