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    What Is a “Massive” Concrete Structure at Early Ages? Some Dimensional Arguments

    Source: Journal of Engineering Mechanics:;2001:;Volume ( 127 ):;issue: 005
    Author:
    Franz-Josef Ulm
    ,
    Olivier Coussy
    DOI: 10.1061/(ASCE)0733-9399(2001)127:5(512)
    Publisher: American Society of Civil Engineers
    Abstract: The risk of early-age concrete cracking depends on the capacity of hardening concrete to support the thermal stresses caused by the exothermic nature of the hydration process. This has been recognized for “massive” concrete structures. However, with the increasing use of high performance concretes, it is apparent that this problem also concerns traditionally “thin” structural members (columns, beams). The definition of a “massive” concrete structure, and how the structural dimension affects intensity and occurrence of chemically-induced strucctural degradation is the main focus of this paper. Based on dimensional analysis of the governing equations, a characteristic length scale, the hydration heat diffusion length, is derived; beyond this length the structure needs to be considered as “massive,” and latent hydration heat effects affect the long-term structural integrity. From experimental data of normal strength concrete and high performance concrete, it is shown that this hydration heat diffusion length of high performance concrete is of the order of ℓ
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      What Is a “Massive” Concrete Structure at Early Ages? Some Dimensional Arguments

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    http://yetl.yabesh.ir/yetl1/handle/yetl/85382
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    contributor authorFranz-Josef Ulm
    contributor authorOlivier Coussy
    date accessioned2017-05-08T22:39:33Z
    date available2017-05-08T22:39:33Z
    date copyrightMay 2001
    date issued2001
    identifier other%28asce%290733-9399%282001%29127%3A5%28512%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/85382
    description abstractThe risk of early-age concrete cracking depends on the capacity of hardening concrete to support the thermal stresses caused by the exothermic nature of the hydration process. This has been recognized for “massive” concrete structures. However, with the increasing use of high performance concretes, it is apparent that this problem also concerns traditionally “thin” structural members (columns, beams). The definition of a “massive” concrete structure, and how the structural dimension affects intensity and occurrence of chemically-induced strucctural degradation is the main focus of this paper. Based on dimensional analysis of the governing equations, a characteristic length scale, the hydration heat diffusion length, is derived; beyond this length the structure needs to be considered as “massive,” and latent hydration heat effects affect the long-term structural integrity. From experimental data of normal strength concrete and high performance concrete, it is shown that this hydration heat diffusion length of high performance concrete is of the order of ℓ
    publisherAmerican Society of Civil Engineers
    titleWhat Is a “Massive” Concrete Structure at Early Ages? Some Dimensional Arguments
    typeJournal Paper
    journal volume127
    journal issue5
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)0733-9399(2001)127:5(512)
    treeJournal of Engineering Mechanics:;2001:;Volume ( 127 ):;issue: 005
    contenttypeFulltext
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