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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: Durability Considerations for Concrete Water-Retaining Structures
Author(s): Nihal Vitharana
Publication: Special Publication
Appears on pages(s): 1379-1410
Keywords: Concretes; cracking (fracturing); durabilty; heat-of-hydration; loads
(forces); shrinkage; stiffness; strains; temperature; thermal stresses.
Abstract:This paper presents the results of several studies carried out on the parameters affecting the durability and serviceability performance of concrete water-retaining structures. It has been identified that one of the main causes for the early deterioration of concrete water-retaining structures is the occurrence of strain-induced loadings arising from temperature changes, shrinkage, and swelling. However, a majority of the current design guidelines and recommendations are quite cursory in this regard. The evaluation of induced strains, as well as stresses generated by the restraining effects, is quite complex compared with the effort needed for much-familiar dead and live loads. It was shown that the strain-induced loadings are as significant as the hydrostatic loading. The inevitable cracking of concrete relaxes the strain-induced loadings and this aspect should be considered if economical and practical designs are to be achieved. Swelling of concrete, occurring after filling the reservoir, generates a differential strain gradient across the wall thickness. A comprehensive analysis method was developed to predict the wall structural behaviour from basic moisture transfer modeling. Creep of concrete would relax the induced stresses by about 50% generally. Concretes with low W/C have been introduced recently in order to achieve improved impermeability properties and strength parameters. An inherent property of low W/C concrete is the autogenous shrinkage taking place during hydration. When restrained, this could cause through-depth cracking, thus making the structures unserviceable.
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