Influence of water repellent treatment on corrosion of steel in concrete

Title: Influence of water repellent treatment on corrosion of steel in concrete
Author(s): T. Zhao, Z. Ren, Z. Sun
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 525 - 534
Total Pages: 10
Nb references: 11
Language: English

Abstract: Corrosion of steel due to chloride ingress is a worldwide problem in reinforced concrete.
In order to control such chloride-induced corrosion and evaluate the effectiveness of silane liquid treatment on reinforced concrete, four groups of reinforced concrete specimens were used to investigate experimentally. In the first group, concrete specimens were made with initial chloride in the mix. The second group is as same as the first one but with water repellent treatment. The third group of concrete specimens was applied migrating chloride from a reservoir of 3% NaCl solution which was placed on the top surface of each specimen.
The last group is same to the third one but with silane liquid impregnation in advance. Two water cement ratios of 0.4 and 0.6 in each group of concrete were adopted. And tests were taken with half-cell potential and polarization resistance methods. Results show that the steels in concrete with W/C of 0.6 have more negative half cell potential, higher mass loss ratio and bigger corrosion current density than those with W/C of 0.4, and the effect of improvement through silane liquid surface treatment is evident. Silane liquid surface treatment can provide effective corrosion protection to reinforcing steel in the concrete with migrating chloride, but can not adequately control the corrosion in cases significant internal chloride contamination was present in concrete or corrosion has initiated.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00