Experimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration
Publication: Journal of Structural Engineering
Volume 144, Issue 8
Abstract
Slight and moderate amounts of deterioration caused by alkali silica reaction (ASR)/delayed ettringite formation (DEF)-induced expansion in reinforced concrete specimens do not markedly or detrimentally affect its structural load-carrying capacity. However, effects of severe (late-stage) ASR/DEF deterioration on the load-carrying capacity of structures is not known. A large-scale reinforced concrete C-beam specimen with heavy ASR/DEF deterioration is load tested in the laboratory. A comparison of the force-deformation results of the severely deteriorated specimen with the undamaged control specimen, and slightly and moderately ASR/DEF-deteriorated specimens, shows that there is no reduction in the load-carrying capacity. The mode of failure of the specimen is a brittle joint-shear failure similar to the other C-beam specimens. However, a reduction in the ductility of the heavily deteriorated specimen is observed. Postfailure examination shows a significant degree of corrosion in the longitudinal and transverse reinforcement. Significant bulging and complete debonding of the lapped transverse U-bars in the specimen knee-joint caused considerable loss in confinement of the softened concrete, resulting in an embrittled performance and sudden early loss of load in the heavily damaged specimen. It is not known how further corrosion in conjunction with severe ASR/DEF deterioration could affect the future behavior of the structure.
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Acknowledgments
This research was made possible through financial support from the Texas Department of Transportation and Federal Highway Administration (Grant No. 0-5997). The work presented was also part of the first author’s Ph.D. dissertation under the supervision of Professor John B. Mander and Professor Stefan Hurlebaus.
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Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 22, 2017
Accepted: Feb 4, 2018
Published online: May 31, 2018
Published in print: Aug 1, 2018
Discussion open until: Oct 31, 2018
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