Strength characterization of open-graded aggregates for structural backfills

Nicks, J. E.; Gebrenegus, T.; Adams, M. T.

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Strength characterization of open-graded aggregates for structural backfills

2015-06-01
By Nicks, J. E. ; Gebrenegus, T. ; Adams, M. T.

File Language:

English

[PDF - 11.00 MB]

Details

Creators:

Nicks, J. E. ; Gebrenegus, T. ; Adams, M. T.
Corporate Creators:

United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
Corporate Contributors:

United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
Subject/TRT Terms:
Publication/ Report Number:

FHWA-HRT-15-034
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
Abstract:

Open-graded aggregates are common in road and bridge construction because they are easy to place, and they have the advantages of very low fine content, free-draining characteristics, low frost heave potential, and simple quality assurance testing. They are a suitable alternative to well-graded aggregate blends in many applications. Another key benefit is their strength, but this attribute it is often not accounted for in design. This report presents strength characteristics of 16 open-graded aggregates commonly selected as structural backfills and discusses the impact of different test and data interpretation methods. Results of large-scale direct shear and large diameter triaxial tests indicate higher strengths for these materials than typical default values typically assumed in design. It was also observed that the mean grain size, sphericity, angularity, and void ratio play a role in the measured friction angles. This information will help designers better understand these backfills and aid in the cost-effective design of retaining walls and bridge foundations.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/35884/dot_35884_DS1.pdf
File Type:

[PDF - 11.00 MB]
Collection(s):

Federal Highway Administration
Main Document Checksum:

urn:sha-512:eab16be13a40cd8ec9c7d8a6c5763e108753eb76abaaa9547f057bbc49af0f9e35fc10064037fd9e562e3f6cc3f256c929f13fae4d314191e54a8d4fd93abfac

File Language:

English

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