Electro active repair of concrete for improved durability of conventional repair
conference paper
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 patent was granted and a world
wide patent 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
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 patent was granted and a world
wide patent 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
TNO Identifier
528638
ISBN
978-1-138-02843-2
Publisher
CRC Press
Source title
Concrete Repair, Rehabilitation and Retrofitting IV: 4th International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR-4), 5-7 October 2015, Leipzig, Germany
Editor(s)
Dehn, F.
Beushausen, H.D.
Alexander, M.
Moyo, P.
Beushausen, H.D.
Alexander, M.
Moyo, P.
Pages
703-709
Files
To receive the publication files, please send an e-mail request to TNO Repository.