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Non-destructive evaluation of corrosion activity in reinforced concrete slab

Ismail, Mohamed ElGelany and Ismail, Mohamed Amri and Ohtsu, M. (2008) Non-destructive evaluation of corrosion activity in reinforced concrete slab. In: Proceedings of the 4th International Structural Engineering and Construction Conference, ISEC-4 - Innovations in Structural Engineering and Construction. Taylor & Francis Ltd, England, 1135 -1141. ISBN 978-041545755-2

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Abstract

Nondestructive evaluation of corrosion of steel reinforcement in concrete due to ingress of chloride ions is intensively studied in a laboratory. Acoustic emission (AE) is used directly to estimate corrosion activity. Half-cell potential, polarization resistance and concrete resistivity are applied to evaluate corroded areas, compensating the potentials by the inverse boundary element method (IBEM). Embedded sensors attached to rebars are also employed to measure half-cell potential, polarization resistance and concrete resistivity in concrete. Results show that AE events are effectively associated with corrosion activity. It is noticed that no other techniques have managed to give an earlier warning of corrosion than AE technique. Half cell potential could locate the corroded areas in the concrete slab, while concrete resistivity and polarization resistance underestimate them. Embedded sensors are confirmed to be a promising tool for real-time monitoring for both corrosion activity and corrosion areas in reinforced concrete.

Item Type:Book Section
Additional Information:ISBN: 978-041545755-2; 4th International Structural Engineering and Construction Conference, ISEC-4 - Innovations in Structural Engineering and Construction; Melbourne, VIC; 26 September 2007 through 28 September 2007
Uncontrolled Keywords:acoustic emissions, boundary element method, building materials, chemical sensors, composite beams and girders, concrete blocks, concrete buildings, concrete products, concrete slabs, corrosion, electrochemical corrosion, innovation, numerical analysis, polarization, reinforced concrete, reinforcement, sensors
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:12845
Deposited By: Mrs Liza Porijo
Deposited On:04 Jul 2011 01:28
Last Modified:04 Jul 2011 01:28

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