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Determination of stress relaxation parameters of concrete in tension at early-age by ring test
Highlights ► A ring test based method to determine the stress relaxation parameters of concrete in tension is developed. ► The creep relaxation parameters of three kinds of concretes under tension are obtained. ► The stress relaxation parameters are used in shrinkage stress tests and good agreement between model and test data is found.
Abstract In this paper, the ring test is used to determine the stress relaxation parameters of concrete in tension at early-age. Through ring test, the steel–concrete interfacial compressive stress generated from shrinkage of concrete is obtained first. Meanwhile, the theoretical value of the interfacial compressive stress is precisely calculated by a model for given shrinkage of concrete. In the model, a power function with three unknown constants was used to model the viscoelastic behavior of concrete under tension. The expected stress relaxation constants can then be determined with the condition that the difference between calculated and tested interfacial compressive stresses satisfies the required tolerance. Using this mythology, the creep relaxation parameters of three kinds of concretes with compressive strength at 28days around 30MPa, 50MPa and 80MPa are obtained. The determined stress relaxation parameters are used in the existing experimental results of shrinkage stress tests that are independently carried out and reasonable agreement between model and test data is found.
Determination of stress relaxation parameters of concrete in tension at early-age by ring test
Highlights ► A ring test based method to determine the stress relaxation parameters of concrete in tension is developed. ► The creep relaxation parameters of three kinds of concretes under tension are obtained. ► The stress relaxation parameters are used in shrinkage stress tests and good agreement between model and test data is found.
Abstract In this paper, the ring test is used to determine the stress relaxation parameters of concrete in tension at early-age. Through ring test, the steel–concrete interfacial compressive stress generated from shrinkage of concrete is obtained first. Meanwhile, the theoretical value of the interfacial compressive stress is precisely calculated by a model for given shrinkage of concrete. In the model, a power function with three unknown constants was used to model the viscoelastic behavior of concrete under tension. The expected stress relaxation constants can then be determined with the condition that the difference between calculated and tested interfacial compressive stresses satisfies the required tolerance. Using this mythology, the creep relaxation parameters of three kinds of concretes with compressive strength at 28days around 30MPa, 50MPa and 80MPa are obtained. The determined stress relaxation parameters are used in the existing experimental results of shrinkage stress tests that are independently carried out and reasonable agreement between model and test data is found.
Determination of stress relaxation parameters of concrete in tension at early-age by ring test
Gao, Yuan (author) / Zhang, Jun (author) / Han, Po (author)
Construction and Building Materials ; 41 ; 152-164
2012-12-04
13 pages
Article (Journal)
Electronic Resource
English
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