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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Identification of viscoelastic behavior for early-age concrete based on measured strain and stress histories
Author(s): Seongcheol Choi, Soo Cha, Byung Oh
Appears on pages(s): 1161-1175
Keywords: Compliance function, Early-age concrete, Indentification, Relaxation function, Viscoelastic property
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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