University of Illinois Urbana-Champaign

Some aspects of fatigue of concrete

Neal, John A.; Kesler, Clyde E.

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https://hdl.handle.net/2142/112365

Description

Title
Some aspects of fatigue of concrete
Author(s)
  • Neal, John A.
  • Kesler, Clyde E.
Contributor(s)
  • Illinois. The Division of Highways
  • U.S. Department of Commerce. Bureau of Public Roads
Issue Date
1965-07
Keyword(s)
  • Concrete, Fatigue Of
  • Fatigue Of Concrete
Abstract
"Previous studies of fatigue behavior of plain concrete are reviewed and discussed. In particular, the fundamental studies at the University of Illinois into fatigue behavior, shrinkage stresses and strains, effect of rate of load application, dynamic properties, and fracture mechanics are considered . The relations of each of these areas to the fatigue problem and to each other are discussed. For example, it is suggested that the rate of application of the fatigue load is responsible for an apparent strength greater than the static strength when the curve is extrapolated to one cycle of load. Similarities and differences between static and fatigue failures of plain concrete are discussed . It is proposed that the failure under static and fatigue conditions take place by mechanisms which are physically similar but different in degree or in ""speed"". The macroscopic mechanism is discussed and the frequently observed phenomenon that strains increase rapidly toward the end of a fatigue test is explained by this macroscopic mechanism and the observation that all strain measuring devices have a finite gage length. A microscopic mechanism of static and fatigue failure is proposed which involves minute relocations of particles of cement gel and the gradual transfer of load to primary bonds and mechanical contact forces in the gel structure. It is shown that the proposed mechanism is consistent with observed behavior both in fatigue and in delayed elasticity phenomena. Finally, the current state of knowledge in fatigue of plain concrete is summarized, and specific suggestions for proposed work areas are offered."
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 657
  • 1981-8537
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112365
Sponsor(s)/Grant Number(s)
Illinois Highway Division 65/07; Commerce Department Bureau of Public Roads 65/07 PROJ IHR 73 65/07
Copyright and License Information
Copyright 1965 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.