Title
Electro active repair of concrete for improved durability of conventional repair
Author
Polder, R.B.
Geiker, M.R.
Contributor
Dehn, F. (editor)
Beushausen, H.D. (editor)
Alexander, M. (editor)
Moyo, P. (editor)
Publication year
2015
Abstract
Chloride induced reinforcement corrosion is increasing due to aging of concrete infra structure. Conventional repairs have poor durability and many fail after less than 10 years. For conven tional repair chloride contaminated concrete is removed, steel is cleaned and new concrete is applied. Leaving chiorides, eg. in pits, corrosion may re-activate and the repair fails. The authors have invented a pre-treatment for conventional repair, called Electro Active Repair (EAR) for electrochemical removal of chlorides from corrosion products and pits. After removal of contaminated concrete, a temporary mate rial and a temporary anode are installed and cathodic current is applied for 24 hours. Next. temporary materials are removed and repair is executed as usual. A European was granted and a world wide applied for. The principle was conhrmed in laboratory experiments. A cementitious material was placed between NaOH and FeCl, solutions. More than 90% of the chloride was removed from the catholyte (FeCI,) in 20 hours at 8 A1m2 and the pH increased from 3 to 12, which will prevent re-activation of corrosion and consequently improve the durability of the repair. The method has the advantage that it fits in the conventional repair process
Subject
Fluid & Solid Mechanics
SR - Structural Reliability
TS - Technical Sciences
Buildings and Infrastructures
Materials
2015 Urbanisation
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http://resolver.tudelft.nl/uuid:e8f9c674-9c5f-49de-9028-9fc77bceb3a6
TNO identifier
528638
Publisher
CRC Press
ISBN
9781138028432
Source
Concrete Repair, Rehabilitation and Retrofitting IV: 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4), 5-7 October 2015, Leipzig, Germany, 703-709
Document type
conference paper