Creep Response of Compacted Waste Foundry Sands for Use as Roadway Embankment Fill
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 2
Abstract
Compressibility of five different samples of waste foundry sand (WFS) was evaluated through one-dimensional and triaxial compression tests to assess permanent strains under vertical and deviator stresses present in typical highway embankments. Results show that WFS containing a blend of sand and bentonite had higher compressibility than compacted natural sand. Compressibility of WFS is dependent on stress magnitude, time, and bentonite content. All samples of WFS exhibited one-dimensional secondary compression and deviatoric creep response similar to that of compacted natural soils. Compressibility and potential for creep rupture systematically increased with increasing bentonite content. For samples with relatively high bentonite content (12.8%), the maximum deviator stress to prevent creep rupture was reduced to 65% of the material’s compressive strength. One-dimensional compressibility parameters for compacted WFS were characterized as functions of bentonite content. Models were developed to estimate secondary compression ratio, deviatoric creep strain rates, and time to creep rupture for WFS at different stress levels and bentonite contents.
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Acknowledgments
Authors acknowledge the foundry companies for providing the WFS samples. These include AFK Corporation (Ripon, Wisconsin), Arrowcast, Inc. (Shawano, Wisconsin), Neenah Foundry (Neenah, Wisconsin), Grede Foundry (Milwaukee, Wisconsin), and Grede Foundry (Browntown, Wisconsin). The authors are also grateful to Dr. Kuo Tian for his help with SEM tests and to Mr. Xiaodong Wang for his assistance with the compression tests. The first author acknowledges support from the Jiangsu Government Scholarship for Overseas Studies (JS-2013-092) and NSFC (41402251 and 51478209). The opinions, findings, conclusions, and recommendations expressed herein are those of the authors and do not necessarily represent the views of the sponsors.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 2 • February 2018
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©2017 American Society of Civil Engineers.
History
Received: Jan 24, 2017
Accepted: Jun 28, 2017
Published online: Dec 15, 2017
Published in print: Feb 1, 2018
Discussion open until: May 15, 2018
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