Specifications and Testing for Corrosion Durability of Marine Concrete: the Australian Perspective

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Title: Specifications and Testing for Corrosion Durability of Marine Concrete: the Australian Perspective

Author(s): F. G. Collins and W. R. Grace

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 757-776

Keywords: Blended cements; chlorides; corrosion; diffusion; marine atmospheres; specifications; standards.

Date: 7/1/1997

Abstract:
This paper discusses the present status of specifying concrete for corrosion durability in the Australian marine environment. A modified diffusion model for approximating time to corrosion in marine concrete structures based on chloride penetration is discussed and calibrated to data acquired from 7 years of monitoring of a reinforced concrete jetty. A method is suggested for applying laboratory chloride diffusion testing to service life prediction in marine structures. The Australian Standard AS3600 Concrete Structures Cod has been reviewed from the viewpoint of adequacy in relation to durability, and the provisions tested against the proposed service life model. A case history of an Australian offshore concrete structure is presented to describe the author’s proposed performance based approach to specifying concrete in a marine environment for corrosion resistance. This approach underlines the need to balance the durability performance criteria with various design and construction constraints.