SYMPOSIA PAPER Published: 01 January 2000

The Moisture Effect on the Diffusion of Chloride Ion in Hydrated Cement Paste


Previous research [1] showed high chloride concentrations (2% / cement) on the outside surface of reinforced concrete structures in the mist zone of marine environments. However, the chloride penetration reaches low depths for the concrete class used. Observed data have raised suspicions as to the effect of moisture content on the diffusion of chlorides. A test method was developed to assess the changes in the chloride diffusion coefficient with changes in moisture content in cement paste. It was concluded that the saturation degree (SD) (percentage of moisture content in the cement paste in relation to maximum water absorption of the cement paste) has a large influence in the chloride diffusion properties of the hardened cement paste, and this factor must be taken into consideration when predicting the service life of a reinforced concrete structure.

Author Information

Guimarães, ATC
University of São Paulo, São Paulo, SP, Brazil
Helene, PRL
University of São Paulo, São Paulo, SP, Brazil
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Developed by Committee: G01
Pages: 135–149
DOI: 10.1520/STP13558S
ISBN-EB: 978-0-8031-5446-9
ISBN-13: 978-0-8031-2873-6