Self-Consolidating Concrete for Use in Drilled Shaft Applications
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 3
Abstract
When conventional concrete is used in congested drilled shafts, coarse aggregates may bridge between reinforcing bars, which may lead to segregation of the concrete between the inside and outside of the reinforcing cage. The use of self-consolidating concrete (SCC) was evaluated to overcome this problem. The purpose of this study was to compare conventional drilled shaft concrete and SCC in a drilled shaft application. This paper reports on the data collected during the construction and evaluation of five drilled shafts that were 1.0 m in diameter and 7.3 m deep. Three shafts were constructed with conventional drilled shaft concrete and two shafts were constructed with SCC. The five shafts were exhumed, cleaned, and visually inspected to evaluate the quality of the as-built concrete. Cross sections of the exhumed shafts were cut in order to observe the uniformity and the amount of segregation between the inside and outside of the cage. Based on the results of this project, it is concluded that SCC may be feasible for use in congested drilled shaft applications.
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Acknowledgments
The assistance of Mr. Charles Bell during the development of the SCC mixture and during construction of the shafts is appreciated. Dr. Gray Mullins of University of Southern Florida and his team are appreciated for making a portion of the field study possible. The guidance and support of Mr. Rickey Swancey from Degussa Admixtures, Inc. is appreciated. The assistance of Jagan Gudimettla, Carrie McKinney, and Zack Thomas are gratefully acknowledged.
References
American Concrete Institute, (ACI). (2002). “Building code requirements for structural concrete and commentary.” ACI 318 Committee Rep., Farmington Hills, Mich.
Hodgson, D., III. (2003). “Laboratory and field investigations of self-consolidating concrete (SCC).” MS thesis, Civil Engineering, Auburn University, Auburn, Ala.
Neville, A. M. (1995). Properties of concrete, 4th Ed., Wiley, New York.
Petersson, Ö. (1998). “Brite-EuRam project BRPR-CT96-0366: Final Report of Task 2 (Workability).” Brite-EuRam Project, ⟨http://scc.ce.luth.se/public/report/workability⟩ (May 14, 2003).
RILEM. (2001). “Self-compacting concrete: state-of-the-art report of RILEM technical committee 174-SCC self-compacting concrete.” RILEM TC 174, Å. Skarendahl and Ö. Petersson, eds., RILEM Publications S.A.R.L., Paris.
Su, N., Hsu, K. C., and Chai, H. W. (2001). “A simple mix design method for self-compacting concrete.” Cem. Concr. Res., 31(2), 1799–1807.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 3 • June 2005
Pages: 363 - 369
Copyright
© ASCE.
History
Received: Apr 2, 2004
Accepted: Jul 7, 2004
Published online: Jun 1, 2005
Published in print: Jun 2005
Notes
Note. Associate Editor: Nemkumar Banthia
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