Determination of diffusion coefficient of chloride in concrete: An electrochemical impedance spectroscopic approach
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Determination of diffusion coefficient of chloride
in concrete: An electrochemical impedance spectroscopic approach
|
|
| Creator |
Vedalakshmi, R.
Renughadevi, R. Emmanuel, B. Palaniswamy, N. |
|
| Subject |
Corrosion Protection
|
|
| Description |
For predicting the service life of concrete
structures in marine environment, diffusion of chloride
(D) is an important parameter. Electro-migration
tests and ponding tests are two techniques conventionally
adopted, however they are destructive in
nature. EIS (Electrochemical impedance spectroscopy)
being non-destructive appears a promising
technique to arrive at ‘DR’ (D from EIS) in situ in
structures. The DR of ordinary Portland cement
concrete (OPC) was compared with that of Portland
pozzolana cement concrete (PPC). The effect of
curing on DR was analyzed. The splash zone condition
was created by subjecting the specimens to
alternate wetting and drying cycles. At the end of
28 days of curing, the DR of PPC concrete is only
66.7% of that obtained in OPC concrete. A linear
correlation was established between DR and the
porosity of the concrete. Due to pozzolanic reaction,
the rate of pore refinement is faster in PPC concrete
compared to OPC concrete. In M25-PPC concrete at
the end of 28 days of curing, the pore size is
decreased to 14.6% of that obtained at the end of
3 days of curing. The reduction of pore size by
densification of pore structure due to pozzolanic
reaction reduces the DR value in PPC concrete. In
30 MPa concrete the DR under wet cycle is 3 times
higher than in dry cycle, which implied that corrosion
is initiated 3 times faster in concrete exposed to the
splash zone condition.
|
|
| Publisher |
RILEM
|
|
| Date |
2008
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cecri.csircentral.net/436/1/143-2008.pdf
Vedalakshmi, R. and Renughadevi, R. and Emmanuel, B. and Palaniswamy, N. (2008) Determination of diffusion coefficient of chloride in concrete: An electrochemical impedance spectroscopic approach. Materials and Structures, 41 (7). pp. 1315-1326. ISSN 1359-5997 |
|
| Relation |
http://cecri.csircentral.net/436/
|
|