Modeling Early Age Tensile Creep and Shrinkage of Concrete

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Title: Modeling Early Age Tensile Creep and Shrinkage of Concrete

Author(s): M. D. D’Ambrosia and D. A. Lange

Publication: Special Publication

Volume: 227

Issue:

Appears on pages(s): 349-366

Keywords: creep; early age; modeling; restrained drying; shrinkage

Date: 3/1/2005

Abstract:
Creep and shrinkage of concrete were studied under constant load and restrained conditions during the first week after casting. Concrete behavior was characterized by a uniaxial test that measures shrinkage deformation and restrained shrinkage stress. The extent of stress relaxation by tensile creep was determined using superposition analysis. The experimental measurements were compared with current creep and shrinkage models to assess their validity for early age prediction. The ACI 209 equation for creep is currently not applicable to early age, but modifications are proposed that fit a database of early age behavior. The B3 model has been previously modified to accommodate early age creep, and this modification was employed in the current study. Test results for normal concrete with different w/c ratios are discussed.