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Electrical tests to analyse the transport properties of concrete – I: modelling diffusion and electromigration

Abstract

In this chapter, a measurement of electromigration is analysed. The ‘rapid chloride permeability test’ (RCPT) is described in ASTM standard C1202. The aim of the analysis is to obtain the fundamental properties of the concrete (diffusion coefficient and capacity factor) from the test. A computer model is described. The model represents the key processes of diffusion and electromigration using standard equations but then maintains charge neutrality by modelling changes to the voltage distribution. Results are presented to show that the measurement of the non-linearity of the voltage distribution can be used to detect cement ...

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