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A study on the difference of chloride ion diffusibity and degradation of cement mortar due to NaCI and CaCl2 ingress



Title: A study on the difference of chloride ion diffusibity and degradation of cement mortar due to NaCI and CaCl2 ingress
Author(s): M. Hisada
Paper category : conference
Book title: Third International RILEM Workshop on Testing and Modelling Chloride Ingress into Concrete
Editor(s): C. Andrade and J. Kropp
Print-ISBN: 2-912143-48-9
e-ISBN: 2912143578
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 269 - 280
Total Pages: 12
Nb references: 9
Language: English


Abstract: Recently, we have a lot of useful information about the chloride ion diffusivity through
concrete or concrete structures. And most of these researches are based on the Fick's
first and second low, which describes the chloride diffusion by the concentration
difference as driving force. But there is only few discussions about the difference of
chloride diffusivity from the simple viewpoint that "Can we evaluate the diffusion of
chloride from NaCl and that from CaCl2 as the similar phenomenon?"
From these viewpoints, the diffusivity and the change of chemical and physical
properties of hardened cement mortar exposed into NaCl and CaCl2 solutions were
investigated in this paper. As the first step, the mechanisms of chloride diffusivity of
NaCl and CaCl2 solution in mortar specimen were discussed. Ion diffusion cells were
used in these investigations. Secondly, as the chemical change of mortar specimens, the
cement hydration products, Ca(OH)2, CSH, and AFm were quantitatively measured.
Furthermore, micro pore volume and Vickers hardness were measured as the change of
physical properties of mortar. Through these measurements, the relation between ion
diffusivity and the change of mortar properties were discussed.


Online publication: 2002-12-15
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143578.018