Corrosion performance of steel in composite concrete system admixed with chloride and various alkaline nitrites
IR@CECRI: CSIR-Central Electrochemical Research Institute, Karaikudi
View Archive Info| Field | Value | |
| Title |
Corrosion performance of steel in composite
concrete system admixed with chloride and various alkaline nitrites
|
|
| Creator |
Song, H.W.
Saraswathy, V. Muralidharan, S. Lee, C.H. Thangavel, K. |
|
| Subject |
Corrosion Science and Engineering
|
|
| Description |
Composite concrete systems consist of both binary and ternary cements were designed. The
corrosion performance of steel in composite concrete systems admixed with sodium chloride
(3%NaCl) and different alkaline nitrites (0?5%NO2 2 ), namely sodium nitrite (NaNO2), potassium
nitrite (KNO2) and calcium nitrite [Ca(NO2)2] were studied by conducting various electrochemical
and non-electrochemical techniques. Open circuit potential and weight loss measurements were
carried out for 180 days of exposure. The permeability characteristics of the composite concrete
systems were studied using impressed voltage technique and rapid chloride permeability test.
Linear polarisation studies showed better corrosion resistance properties of steel in binary and
ternary cement concrete even in the presence of 3% sodium chloride. Chloride diffusion studies
revealed that the diffusion coefficient was found to be much less for (OPCzPSC) and ternary
systems. Nitrites of sodium, potassium and calcium act as anodic inhibitors and they compete
with chloride ions for the ferrous ions at the steel surface to form a film of ferric oxide. Ternary
systems and (OPCzPSC) performed better even in the presence of a higher amount of
aggressive chloride ions. The reduction in the corrosion rate of steel in composite concrete
systems follows the order: (OPCzPPCzPSC).(OPCzPSC).(OPCzPPC).(PPCzPSC).
|
|
| Publisher |
Maney
|
|
| Date |
2009
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cecri.csircentral.net/305/1/030-2009.pdf
Song, H.W. and Saraswathy, V. and Muralidharan, S. and Lee, C.H. and Thangavel, K. (2009) Corrosion performance of steel in composite concrete system admixed with chloride and various alkaline nitrites. Corrosion Engineering, Science Technology, 44 (6). pp. 408-415. ISSN 1478-422X |
|
| Relation |
http://cecri.csircentral.net/305/
|
|