Electrochemical behavior of reinforcing steel in modified concrete and cement extract

Title: Electrochemical behavior of reinforcing steel in modified concrete and cement extract
Author(s): D.A. Koleva, K. van Breugel, J.M.C. Mol, J.H.W. de Wit
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 663 - 671
Total Pages: 9
Nb references: 19
Language: English

Abstract: This work reports on the electrochemical behaviour of steel reinforcement in modified concrete mixtures i.e. this is a comparative study of reinforced concrete, using Blast Furnace Slag (BFS) cement and Ordinary Portland cement (OPC); and reinforced concrete, using OPC, compared to a mixture where OPC was partially (20%) replaced with the waste Red Mud (RM). Further, hereby discussed is the corrosion performance of steel in cement extracts (CE) of OPC and BFS with and without RM addition. The investigation aimed at monitoring chloride-induced corrosion in the modified reinforced concretes, and cement extracts respectively, deriving corrosion resistance in the presence of wastes; the tests in CE aimed at studying the possibility for replacing BFS with RM.
After approximately 150 days of conditioning, the OPC specimens present active corrosion state, whereas no corrosion is initiated in BFS and RM containing specimens i.e. the presence of both slag and red mud significantly delays corrosion initiation. Further, the preliminary investigation in CE reveals the higher corrosion resistance of steel in RM containing solutions (both OPC and BFS), compared to control, RM-free ones, thus an improvement of the steel corrosion resistance in BFS concrete, when RM is involved as slag replacement, is deemed possible.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00