Shear Characteristics and Design for High-Strength Self-Consolidating Concrete
Publication: Journal of Structural Engineering
Volume 136, Issue 8
Abstract
To achieve adequate flow and homogeneous concrete for precast, prestressed members, self-consolidating concrete (SCC) typically has higher paste and lower coarse aggregate volumes than conventional concrete (CC). The lower aggregate content of SCC can affect the shear capacity of concrete systems. This research performed 48 push-off tests to investigate the influence of SCC aggregate and paste volumes on the shear capacity and these results were compared with those obtained from similar CC samples. The variables included coarse aggregate type (river gravel and limestone), three coarse aggregate volumes for the SCC mixtures, and two target 16-h release strengths [34 and 48 MPa (5 and 7 ksi)]. The aggregate type, aggregate volume, and concrete strength were found to have significant effects on the aggregate interlock. Test results were used to propose new aggregate interlock models based on the modified compression field theory adopted in the AASHTO Load and Resistance Factor Design Specifications. More appropriate expressions have been developed to determine the limiting value of concrete shear strength for CC and SCC precast, prestressed concrete girders with similar mixture proportions, and a 28-day compressive strength greater than 70 MPa (10 ksi).
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Acknowledgments
This study was conducted at Texas A&M University (TAMU) and was supported by TxDOT and FHWA through the Texas Transportation Institute (TTI) as part of Project 0-5134, Self-Consolidating Concrete for Precast Structural Applications. This study was jointly performed with Dr. David Fowler and Dr. Eric Koehler at the University of Texas at Austin, who focused on developing the mixture proportions and evaluating the fresh properties of SCC. Their collaboration is greatly appreciated. The valuable input of J. Tucker (TxDOT), R. Browne (TxDOT), J. Moore (TxDOT), and P. Forsling (FHWA) is appreciated. The writers also wish to thank Dr. P. Keating, M. Potter, S. Smith, and J. Perry of the Civil Engineering High Bay Structural and Materials Laboratory (HBSML) at TAMU and all the students who assisted with the study. The writers also thank BASF Construction Chemicals LLC (A. Pinnelli, V. Bui, E. Attiogbe, and B. Rogers) for their support and suggestions throughout this research.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 8 • August 2010
Pages: 989 - 1000
Copyright
© 2010 ASCE.
History
Received: Feb 24, 2009
Accepted: Jan 24, 2010
Published online: Jul 15, 2010
Published in print: Aug 2010
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