Expansive Behavior in Circular Steel Tube Stub Columns of SCC Blended with CFB Bottom Ashes
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 11
Abstract
This work provides a systematic analysis of the expansive and load-deformation behaviors in circular steel tube stub columns (CSTCs) of self-compacting concrete (SCC) blended with ground circulating fluidized bed (CFB) bottom ashes (BAs). A series of SCCs with different expansive properties was fabricated by adding CFB-BAs. As the dosage of CFB-BAs increased, the time-dependent circumferential and axial strains increased. The expansive and load-deformation behaviors of cured SCCs filling the CSTCs were evaluated. Time-dependent expansive strain (TDES) measurements revealed that the expansive behavior in both the circumferential and axial directions had the same variation trend. The circumferential TDES values were much larger than the axial values. The axial load-displacement relations indicated that the specimen with 30% CFB-BAs had a 34% higher ultimate load, and it had a 54% higher ultimate load when 1.5% sodium sulfate was added to the specimen. The prestress had a significant impact on the ultimate capacity of concrete-filled steel tubes (CFTs). However, the ultimate capacity still was determined by the compressive strength of the core concrete, and it was not directly proportional to the initial prestress. The specimen with a 4-mm wall thickness and 30% CFB-BAs gained the most ultimate stress, indicating that the wall thicknesses of steel tubes had a distinct influence on the load-deformation behavior.
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Acknowledgments
This work was financially supported by the Graduate Student Education Innovation Projects of Shanxi Province (No. 2016163), Science Fundamental Research Projects of Shanxi Province (Nos. 201601D202048 and 201801D221233), Key Research and Development (R&D) Projects of Shanxi Province (No. 201803D121037), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No. 2015062), and Key Research Projects of Shanxi Province (No. 201703D321009-2).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 11 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 13, 2017
Accepted: Jun 5, 2019
Published online: Sep 4, 2019
Published in print: Nov 1, 2019
Discussion open until: Feb 4, 2020
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