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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: Service Life Demonstration Based on Simulated Exposure and Numerical Modeling
Author(s): N. R. Buenfeld
Publication: Special Publication
Appears on pages(s): 1-10
Keywords: cement; chloride; concrete; life prediction; numerical modelling; simulated exposure
Abstract:Modelling chloride transport is usually an integral part of demonstrating that a concrete structure in a chloride-rich environments will have the required service life. Ideally this should take account of spacial and temporal variations in exposure environment and concrete properties. This paper describes how this may be approached through a combination of simulated natural exposure and numerical modelling. This approach helps to reduce the errors associated with coupling different transport processes. The example taken is a reinforced concrete tunnel exposed to chloride-contami-nated groundwater. In a laboratory experiment, opposite faces of specimens of tunnel lining concrete were exposed to the maximum hydrostatic head (30m) of groundwater and the minimum relative humidity (35%) expected inside the tunnel and water outflow and chloride accumulation were monitored over a 3 year period. Water vapourdiffusion, chloride binding and porosity measurements were made on parallel specimens. The measurements were used as inputs to a numerical model of water and chloride transport to extrapolate from the measured chloride profiles to predict future chloride profiles. The results were very sensitive to ground water chloride concentration and chloride threshold level, but relatively insensitive to hydrostatic head.
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