Electrochemical Methods For The Preservation
Of Masonry Clad Structural Frames
Author(s)
P. Lambert & Y.-Y. Wu
Abstract
A large number of historic structures incorporate wrought iron or early steel
components within the masonry. Generally, these were incorporated at the time
of construction or in later refurbishments to enhance the structural integrity or
fire resistance of the buildings. With time, and in the presence of moisture and
oxygen, the ferrous component starts to corrode and the voluminous corrosion
products cause cracking and spalling of the surrounding masonry. The
traditional method of dealing with such problems has been to remove the
affected masonry and treat or replace the corroded metalwork prior to
reinstatement. This is not only expensive, but involves the removal of large
amounts of the original masonry, which may have to be replaced with modern
equivalents. A more effective and sensitive option is available through the use of
electrochemical treatments, specifically cathodic protection which was originally
developed by Sir Humphry Davy in the early 19 th century for the preservation of
naval vessels. This paper discusses the development of this technology from
early naval trials to recent development for use on heritage buildings and
introduces the numerical methods for modelling of cathodic protection systems
that assist in the design optimisation of such systems for protecting historically
sensitive structures with the minimum of physical disruption. A number of
existing and developing electrochemical approaches to corrosion control are also
discussed. This work is being undertaken at the Centre for Infrastructure
Management, Sheffield Hallam University with support from the Royal Society.
Keywords: corrosion, masonry, steel frame, cathodic protection, galvanic or
sacrificial anodes, impressed current, numerical modelling.
1 Introduction
The identification of "Regent Street Disease" in the United Kingdom in the late
1970's highlighted the problems of the corrosion of iron and steel frames and
Keywords
corrosion, masonry, steel frame, cathodic protection, galvanic or
sacrificial anodes, impressed current, numerical modelling.
Related Book
Other papers in this volume
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