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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: Influence of Passive Reinforcement on Creep and Shrinkage of Concrete: Long-Term Observations
Author(s): K. Audenaert and L. Taerwe
Publication: Special Publication
Appears on pages(s): 217-228
Keywords: creep; long-term behavior; shrinkage; stress redistribution
Abstract:In most concrete structures, a gradual stress transfer occurs between concrete and steel due to the time-dependent concrete deformations. This aspect is of particular interest in partially prestressed concrete members where significant tensile stresses may develop due to the restrained concrete deformations. To study this effect, a long-term research project was started in the 1970’s.
In 1979, 16 concrete prisms with dimensions 140 x 150 x 4000 mm were manufactured. They differed by the amount of passive reinforcement (rs respectively 0; 1.5; 3 and 6 %) and by the level of the applied compressive stress (sc = 0; 5; 10 or 15 N/mm²). The compressive force was applied at 28 days by means of unbonded strands. The prisms were placed in an air-conditioned room at 20 ± 1 °C and 60 ± 3 % R.H.
During more than 25 years, deformation measurements were carried out to determine the redistribution of stresses due to the restraining effect of the passive reinforcement on shrinkage and creep of concrete.
In this article the results of the deformation measurements will be given and compared with an analysis based on the model for creep and shrinkage given in the CEB-FIP Model Code 1990.
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