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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: Fatigue of Reinforced Concrete in Sea Water
Author(s): W. S. Paterson
Publication: Special Publication
Appears on pages(s): 419-436
Keywords: beams (supports); crack width and spacing; cyclic loads; fatigue (materials); fatigue tests; loads (forces); reinforced concrete; sea water.
Abstract:Tests have been carried out to determine the fatigue life of Torbar cold worked reinforcement in concrete beams in a seawater environment at a loading frequency of 0.1 Hz (near wave frequency) and also at 3.0 Hz so that long endurance tests at low stress ranges could be accomplished within a reasonable time scale. The adoption of a mechanical loading system offered a considerable saving in construction and running costs of the rigs compared with conventional servo-hydraulic systems. It also simplified the arrangements for tests at a simulated water depth of 30m which were performed in a purpose made pressure chamber. The results have indicated that the fatigue life of Torbar in seawater is lower than in air when the test duration is greater than 1 to 2 months when the conditions exist for a fatigue crack to initiate at a corrosion site. A significant feature of the research was that the beams exhibited the phenomenon of 'cyclic stiffening' resulting from a build up of deposits in the cracks in the concrete. This caused a progressive reduction in the deflection range, the applied load range remaining unchanged. While the stress range in the Torbar was correspondingly reduced, corrosion was not inhibited.
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