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corrosion mechanism prevention and repair measures of rcc structures pdf
#1

The cost of Corrosion in India is currently estimated at about Rs. 24,000 Cr/ year.
Although corrosion could be said to be natures method of recycling, or of returning of a
metal to its lowest energy form, it is an insidious enemy that destroys our cars / plumbing
systems / buildings / bridges / engines / factories etc. Avoiding detrimental corrosion
requires interdisciplinary approach by the designer. The approach paper is written from
various resources keeping the same in mind. This paper explains the process of
environmental attack on steel and shows that there is as such no problem in ensuring
durability of steel structures, if proper protection measures are employed. The paper is
organized into six major sections. The first section deals with the introduction where
typical ratio of steel vs. cement is stated. Section two discusses the topic like Corrosion
definition, measurement of corrosion, simple way to explain Corrosion mechanism and
Corrosion rates as a function of various factors. Section three deals with Corrosion from
the design standpoint, selection of materials and design details to minimize Corrosion?
Finally how do we place an economic value on our selection of alternate material or use
of coatings. The Section four describes the Corrosion prevention and its Control. Design
considerations are discussed to minimize Corrosion and various methods available to
control corrosion including paint systems. Special emphasis has been given to Corrosion
on Steel Structures. Section five gives an insight into the perception and reality on the
corrosion problem. Section six covers some examples of longevity of steel structures.
Finally Section seven touches upon specific cases for Corrosion Protection with special
reference to Cable Stay Bridges, Coating of Rebars and relevant IS standards.

THE CORROSION PROCESS
The nature of corrosion of structural steel, its prevention and control have been
discussed in considerable detail by Kalyanaraman(2) and others(1,3-12). Some of the
important points brought out by these authors are briefly discussed in the
following sections.

What is Corrosion?

Corrosion is defined as the destruction or deterioration of a material because of its
reaction with environment. When metals revert to their combined state, they
corrode. Corrosion may affect one or more properties of the metal, which need to
be preserved,
In case of corrosion of iron and steel, iron oxidizes into iron oxides. These oxides
are usually weaker than steel. They are loosely attached and spall off from the
surface. This leads to reduction in strength and reliability of structures.
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#2
To get information about it please visit the given page link :

http://steel-insdagPromotional/corrosion.pdf
http://indianpowerstationsIPS%202013%20Presentations/Day-2%20at%20PMI%20NTPC%20Noida%20UP/Nalanda/Session%2014%20Chemistry%20for%20Competitive%20Edge/Paper%205%20REPAIR%20&%20REHABILITATION%20OF%20RCC%20STRUCTURES%20DAMAGED%20BY%20CORROSION.pdf
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