pdf corrosion mechanism prevention repair measure of r c c structure ppt
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i want abstract and descrption of ths projct
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The corrosion of steel reinforcement in concrete is complex, but basically it is an electrochemical reaction similar to that of a simple battery. The composition of the mild steel varies along its length and the potentially anodic (negatively charged) and cathodic (positively charged) sites can be established at various points. Since the days of long ago when the great pyramids of Egypt or the Hanging Garden of Babylon, were built, humanity was in search of a building material that can withstand the whims of nature, without any maintenance. In search of that material, humanity finally found a wonderful material 'Portland Cement'.


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During the last century and a half, cement concrete has been widely used for various structures that man could dream or conceive with the misconception that they will last forever. The majority of failures or non-functioning of the structure to its desired service condition is attributed mainly to the lack of understanding of the environmental condition and lack of adequate, systematic and scientific maintenance.

The valuable assets of a country are created through construction. Construction plays a vital role in economic development. It is a precursory activity and a hallmark of the development process of any nation.

The steel reinforcement that is used in RCC, although on the one hand complements the concrete by its weakness in tension (tensile tension), also affects the durability and longevity of the concrete, due to its propensity to the corrosion.
The repair and rehabilitation of concrete structures, which has recently become an activity comparable to construction around the world, is mainly due to the deterioration of concrete due to the corrosion of the built-in steel.

In the early part of this century, when the construction of reinforced concrete began to be widely used, almost completely replacing the building materials used so far, namely. Wood, (stone) Freemasonry and steel sections, etc., the life expectancy of the structures of R. C. was of the order of 100 years. However, at the turn of the century we find these expectations denied and ironically new constructions say that from 20 to 25 years of age, they show a serious deterioration and anguish.

Concrete durability has become a highly discussed issue in global development. Although several factors are responsible for the early stress in reinforced concrete structures it is observed that in most cases, it is due to corrosion of the steel.

Corrosion seems to be a ubiquitous phenomenon that causes widespread destruction of all types of structures in all countries of the world and has come to be known as "Cancer" for concrete. Ideally speaking, good concrete is supposed to provide adequate protection to the flush-mounted steel. This is due to the alkaline protective environment (pH value as high as 12.5) provided by the fresh concrete which results in the formation of a protective coating on the surface of the steel, which passivates it from an additional corrosion.

However, during the course of time, due to carbonation or the entry of chloride ions, the pH value begins to decrease slowly and the alkaline environment of the reinforcing bar is lost, announcing the corrosion process, which in turn Causes cracks and detachment of concrete. Therefore, it will be understood that the crucial factor giving quality and durability to the concrete appears to be its impermeability, which can be ensured by providing sufficient cement content, low weight / mass ratio, complete compaction and cured. The same can be further improved by using suitable blends and by providing an increased concrete cover.

However, these measures are first difficult to perform fully in practice and secondly, they are not found good enough in an aggressive environment. Therefore, it is necessary to provide additional protection to reinforcing steel, especially due to chloride induced corrosion (worse than carbonation corrosion) which can be developed even in good quality concrete.

Most of the deterioration of RCC structures is mainly due to corrosion of the reinforcement. Therefore, the basic understanding of corrosion technology, both for the durability of the structure and rehabilitation work is a must. The steel embedded in the moisturizing cement paste rapidly forms a thin layer of oxide passivity which adheres strongly to the underlying steel and gives it complete protection against the reaction with oxygen and water, ie, the formation of oxide or corrosion. This state of steel is known as passivation.

 
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