Determination of diffusion coefficient of chloride in concrete using Warburg diffusion coefficient
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
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| Title |
Determination of diffusion coefficient of chloride in concrete using Warburg diffusion coefficient
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| Creator |
Vedalakshmi, R.
Saraswathy, V. Song, H.W. Palaniswamy, N. |
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| Subject |
Corrosion Science and Engineering
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| Description |
Assessment of diffusion coefficient of chloride (D) using chloride profile method based on Fick’s law (DFL)
is either overestimates or underestimates the time to initiation of corrosion (Ti). An alternate method for
predicting ‘D’ using Warburg diffusion coefficient (DWI) which is determined from Electrochemical
Impedance Spectroscopy technique (EIS) is established. The results reveal that EIS being non-destructive
appears a promising technique to arrive at time-dependent characteristics of DWI in situ in concrete structures.
DWI is an intrinsic effective diffusivity measures the diffusion of free chloride through the pore
solution present in the interconnected pores. Pore constriction by pozzolanic reaction and higher chloride
binding capacity reduces the DWI in PPC and PSC concrete by a factor of 1.65 and 4 times that of OPC concrete
in 20 MPa concrete; 1.83 and 2.52 in 30 MPa concrete; 24 and 16 times in 40 MPa concrete
respectively.
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| Publisher |
Elsevier
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| Date |
2009
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cecri.csircentral.net/313/1/034-2009.pdf
Vedalakshmi, R. and Saraswathy, V. and Song, H.W. and Palaniswamy, N. (2009) Determination of diffusion coefficient of chloride in concrete using Warburg diffusion coefficient. Corrosion Science, 51 (6). pp. 1299-1307. ISSN 0010-938X |
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| Relation |
http://cecri.csircentral.net/313/
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