Loughborough University
Leicestershire, UK
LE11 3TU
+44 (0)1509 222222
Loughborough University

Centre for Innovative and Collaborative Construction Engineering

2012


Dr Steven Holmes

Thesis

An investigation into the practical and theoretical aspects of hybrid cathodic protection

Project Title

An Investigation of the Electrochemical Protection of Steel Reinforced Concrete

Company

Concrete Preservation Technologies

Supervisors

Academic:
Dr Geoff Wilcox
Dr Peter Robins

Industrial:
Mr Adrian Roberts
Dr Gareth Glass

Director of Research:
Professor Stephen Ison

Period of Research

2007 - 2011

An Investigation of the Electrochemical Protection of Steel Reinforced Concrete

A range of electrochemical treatments for extending the life of reinforced concrete and steel framed structures now exists. The majority of these treatments are relatively new and are continually being developed to improve longevity, simplicity of use and value to the end client. These systems are new and novel and as such the underlying mechanisms are relatively poorly understood and this inhibits client/industry acceptance. Although some studies of the mechanisms of operation have been undertaken, they offer limited understanding of the materials behaviour, longevity and the effects on the surrounding matrix. The most recent of these electrochemical protection technologies is a hybrid system introduced by Concrete Preservation Technologies Ltd. This involves the use of a sacrificial discrete anode as both an impressed current anode and subsequently as a sacrificial anode.

The objective of this study is to gain an improved understanding of the materials behaviour of these new electrochemical techniques with a view to improving performance, assessing potential influence on structures treated and developing improved monitoring techniques. This will be achieved by;

  1. Undertaking a thorough literature survey on existing electrochemical techniques applied to reinforced concrete structures.
  2. Laboratory assessment of the behaviour of existing and modified/new systems through;
    1. Electrochemical characterisation tests in solution
    2. Factors affecting current delivery and current distribution of anodes applied to laboratory test blocks
    3. An assessment of materials behaviour through SEM and chemical analysis.
  3. Laboratory assessment of acid and gas production at the anode
  4. On site evaluation of existing and newly applied electrochemical products/techniques.
  5. Examining existing test methods and determining acceptance criteria.

This research will offer a state of the art understanding of the fundamental behaviour of these electrochemical techniques and their effect on the surrounding matrix. It will identify potential technical improvements and improved methods of evaluation on site.

 

S. P. Holmes, G. D. Wilcox, P. J. Robins, G. K. Glass, A. C. Roberts, Long term assessment of a hybrid electrochemical treatment, Materials and Corrosion (Accepted April 2011, available online

S. P. Holmes, G. D. Wilcox, P. J. Robins, G. K. Glass, A. C. Roberts, The Response of Protective Current to Environmental Conditions During Sacrificial Anode Concrete Repair Treatments, CORROSION, (Accepted June 2011)

S. P. Holmes, G. D. Wilcox, P. J. Robins, G. K. Glass, A. C. Roberts, The Responsive Behaviour of Galvanic Anode Current in Concrete and the Basis for its Utilisation, Corrosion Science, (Accepted June 2011)

S. P. Holmes, G. D. Wilcox, P. J. Robins, G. K. Glass, A. C. Roberts, The Response of Protective Current to Environmental Conditions During Sacrificial Anode Concrete Repair Treatments, proceedings of CORROSION 2011, Houston USA.

 

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+44 (0)1509 222623

The Centre Administrator
CICE
Loughborough University
Leicestershire
LE11 3TU

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