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    Experimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration

    Source: Journal of Structural Engineering:;2018:;Volume ( 144 ):;issue: 008
    Author:
    Karthik Madhu M.;Mander John B.;Hurlebaus Stefan
    DOI: 10.1061/(ASCE)ST.1943-541X.0002102
    Publisher: American Society of Civil Engineers
    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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      Experimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration

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    contributor authorKarthik Madhu M.;Mander John B.;Hurlebaus Stefan
    date accessioned2019-02-26T07:34:17Z
    date available2019-02-26T07:34:17Z
    date issued2018
    identifier other%28ASCE%29ST.1943-541X.0002102.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4247974
    description abstractSlight 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.
    publisherAmerican Society of Civil Engineers
    titleExperimental Behavior of Large Reinforced Concrete Specimen with Heavy ASR and DEF Deterioration
    typeJournal Paper
    journal volume144
    journal issue8
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0002102
    page4018110
    treeJournal of Structural Engineering:;2018:;Volume ( 144 ):;issue: 008
    contenttypeFulltext
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