Mechanism of Cyclic Creep of Concrete


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Title: Mechanism of Cyclic Creep of Concrete

Author(s): A.M. Neville and G.A. Hirst

Publication: Special Publication

Volume: 55


Appears on pages(s): 83-102

Keywords: adsorption; concretes; creep properties; cyclic loads; ; deformation; fatigue tests; microcracking; prestressed concrete; ( shrinkage; strains; stresses; temperature

Date: 8/1/1978

It is shown that the mechanism of cyclic creep, which has been previously suggested to be an accelerated static creep, is made up of two distinct parts: non-elastic deformation and microcracking. The non-elastic deformation in these short-term tests was not affected significantly by shrinkage as such, but rather by the presence of water within the cement paste, and is explained using Ruetz's hypothesis. Microcracking is shown to take place during the first few hours under a cyclic stress and manifests itself as an increase of the internal temperature. The microcracking explains the largely irrecoverable nature of cyclic creep.