Title:
Mechanism of Cyclic Creep of Concrete
Author(s):
A.M. Neville and G.A. Hirst
Publication:
Symposium Paper
Volume:
55
Issue:
Appears on pages(s):
83-102
Keywords:
adsorption; concretes; creep properties; cyclic loads;
; deformation; fatigue tests; microcracking; prestressed concrete;
( shrinkage; strains; stresses; temperature
DOI:
10.14359/6610
Date:
8/1/1978
Abstract:
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.