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    Behavior of Reinforced Concrete Beams with Recycled Concrete Coarse Aggregates

    Source: Journal of Structural Engineering:;2015:;Volume ( 141 ):;issue: 003
    Author:
    Adam M. Knaack
    ,
    Yahya C. Kurama
    DOI: 10.1061/(ASCE)ST.1943-541X.0001118
    Publisher: American Society of Civil Engineers
    Abstract: This paper investigates the flexural and shear behavior of reinforced concrete beams that use recycled concrete aggregates (RCA) as replacement for coarse natural aggregates (e.g., crushed stone, gravel). The experimental results from 12 twin pairs of normal strength concrete beam specimens are presented and compared with predictions from existing code methods and analytical models for conventional concrete. Each pair of beams is saw-cut from a single, longer member to investigate the inherent variability in the results, specifically focusing on locally available recycled materials with minimal processing and construction methods that are consistent with current U.S. practice. It is found that the use of RCA does not cause an observable change in the progression of nonlinear behavior and failure. The effect of RCA on the flexural and shear strength of the beams is also small; however, there is a considerable reduction in the initial stiffness and an increase in the ultimate flexural deflections as the amount of RCA is increased. In general, the predicted results are reasonably close to the measured trends, indicating that existing analytical models and code-based procedures for conventional concrete can also be applied to RCA concrete beams.
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      Behavior of Reinforced Concrete Beams with Recycled Concrete Coarse Aggregates

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    contributor authorAdam M. Knaack
    contributor authorYahya C. Kurama
    date accessioned2017-05-08T22:06:45Z
    date available2017-05-08T22:06:45Z
    date copyrightMarch 2015
    date issued2015
    identifier other28766287.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/71589
    description abstractThis paper investigates the flexural and shear behavior of reinforced concrete beams that use recycled concrete aggregates (RCA) as replacement for coarse natural aggregates (e.g., crushed stone, gravel). The experimental results from 12 twin pairs of normal strength concrete beam specimens are presented and compared with predictions from existing code methods and analytical models for conventional concrete. Each pair of beams is saw-cut from a single, longer member to investigate the inherent variability in the results, specifically focusing on locally available recycled materials with minimal processing and construction methods that are consistent with current U.S. practice. It is found that the use of RCA does not cause an observable change in the progression of nonlinear behavior and failure. The effect of RCA on the flexural and shear strength of the beams is also small; however, there is a considerable reduction in the initial stiffness and an increase in the ultimate flexural deflections as the amount of RCA is increased. In general, the predicted results are reasonably close to the measured trends, indicating that existing analytical models and code-based procedures for conventional concrete can also be applied to RCA concrete beams.
    publisherAmerican Society of Civil Engineers
    titleBehavior of Reinforced Concrete Beams with Recycled Concrete Coarse Aggregates
    typeJournal Paper
    journal volume141
    journal issue3
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)ST.1943-541X.0001118
    treeJournal of Structural Engineering:;2015:;Volume ( 141 ):;issue: 003
    contenttypeFulltext
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