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Identification of viscoelastic behavior for early-age concrete based on measured strain and stress histories

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Abstract

In order to accurately predict the stress of concrete structures that undergo variations of temperature and moisture, a compliance function is required that considers the fast development of material properties in early-age concrete. The purpose of present study is to identify the viscoelastic behavior in actual concrete structures at early ages. To this end, a numerical method to identify the viscoelastic properties from measured strain and stress histories was investigated and a series of full-scale test members was fabricated, from which the behavior of early-age concrete was directly measured. The relaxation function was identified from measured data in the full-scale members and the existing compliance model, which is based on the solidification theory, was modified for incorporation into the early-age behavior. The modified compliance model described the highly viscoelastic behavior of concrete at very early ages and thus allowed more accurate evaluation of deformation and stress in early-age concrete.

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Authors and Affiliations

  1. Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, 3208 Red River, Austin, TX, 78705, USA

    Seongcheol Choi

  2. Department of Civil and Environmental Engineering, Ulsan University, San 29, Muger 2-dong, Ulsan, 680-749, Korea

    Soo Won Cha

  3. Department of Civil Engineering, Seoul National University, San 56-1 Sillim-dong Kwanak-gu, Seoul, 151-742, Korea

    Byung Hwan Oh

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  1. Seongcheol Choi
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  2. Soo Won Cha
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Correspondence to Seongcheol Choi.

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Choi, S., Cha, S.W. & Oh, B.H. Identification of viscoelastic behavior for early-age concrete based on measured strain and stress histories. Mater Struct 43, 1161–1175 (2010). https://doi.org/10.1617/s11527-009-9574-z

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