corrosion of reinforcement in hvfa concrete pdf

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Corrosion Of Reinforcement In Hvfa ConcreteCorrosion of reinforcements has been one of the major challenges that the civil engineers have been facing. Corrosion leads to the formation of rust which results in the spalling of concrete which in turn leads to the exposure of rebars to the aggressive environment. This will acceleratethe ill effects and ultimately leads to the break down of the structure. Corrosion mainly occurs in areas of aggressive environment such as coastal regions. It is very important that corrosion of reinforcement must be prevented in order to have a durable structure. Even though there are many methods to prevent corrosion, most of them are uneconomical and requires great skill. Some of the recent studies in various parts of the world have revealed that High Volume Fly Ash(HVFA) concrete can protect the steel reinforcement more efficiently, so that it can resist corrosion, and thus the structure as a whole. HVFA concrete is a type of concrete in which a part of the cement is replaced by fly ash, which is an industrial waste. Thus the implementation of H V F A concrete can minimize corrosion in an effective way. Moreover it can lead to much durable structure without considerable increase in cost. .Silica Fume ConcreteSilica fume is also referred to as micro silica or condensed silica fume but the term silica fume has been generally accepted. It is a by-product of manufacture of silica and ferrosilicon alloys from high purity quartz and coal in a submerged arc electric furnace. It is reported that the addition of ultra fine particle in HPC improves the strength of concrete. The optimum silica fume proportions in between 20% and 25% by weight of concrete. In it self silica fume does not have any binding properties, but it reacts with calcium hydroxide on hydration of cement and produces the gel i.e. calcium silicatehydrate which has good binding properties. Silica fume has been used in manufacture of high strength concrete.Corrosion of reinforcements has been one of the major challenges that the civil engineers have been facing. Corrosion leads to the formation of rust which results in the spalling of concrete which in turn leads to the exposure of rebars to the aggressive environment. This will accelerate the ill effects and ultimately leads to the break down of the structure. Corrosion mainly occurs in areas of aggressive environment such as coastal regions. It is very important that corrosion of reinforcement must be prevented in order to have a durable structure. Even though there are many methods to prevent corrosion, most of them are uneconomical and requires great skill. Some of the recent studies in various parts of the world have revealed that High Volume Fly Ash (HVFA) concrete can protect the steel reinforcement more efficiently, so that it can resist corrosion, and thus the structure as a whole. HVFA concrete is a type of concrete in which a part of the cement is replaced by fly ash, which is an industrial waste. Thus the implementation of H V F A concrete can minimize corrosion in an effective way. Moreover it can lead to much durable structure without considerable increase in cost.