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Corrosion of Steel in Concrete Structures by Amir Poursaee Book Details
| Book Name | Corrosion of Steel in Concrete Structures |
| Author | Amir Poursaee |
| Category | Civil Engineering Books, Education Books |
| Book Language | English |
| Pages | 314 |
| ISBN | 9780857091222 |
| Country | India |
| Book Size | 6 MB |
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About Corrosion of Steel in Concrete Structures by Amir Poursaee Book
Corrosion of steel in concrete structures is a significant issue that can lead to deterioration and reduced durability of the structures. It occurs when steel reinforcement within concrete comes into contact with moisture, oxygen, and other environmental factors, causing the steel to undergo chemical reactions that result in rust and expansion. This process can compromise the structural integrity of the concrete and lead to cracking, spalling, and other forms of damage. Here are some key points about corrosion of steel in concrete structures:
Causes of Corrosion:
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Moisture and Oxygen: Corrosion of steel in concrete primarily occurs due to the presence of moisture and oxygen in the concrete pores. When moisture and oxygen reach the steel reinforcement, an electrochemical reaction takes place, leading to rust formation.
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Chloride Ions: Chloride ions from sources like seawater, deicing salts, or contaminated aggregates can accelerate the corrosion process. Chlorides break down the passive oxide layer on the steel surface, making it more susceptible to corrosion.
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Carbonation: Carbon dioxide from the atmosphere can penetrate concrete and reduce its pH. As the pH decreases, the protective passive layer on the steel surface can be compromised, leading to corrosion.
Effects of Corrosion:
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Structural Deterioration: Corrosion can weaken the steel reinforcement, leading to a reduction in the load-carrying capacity of the structure. This can result in cracking, deformation, and even collapse in severe cases.
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Cracking and Spalling: As rust forms on the steel, it expands, causing internal pressure within the concrete. This pressure can lead to cracking and spalling of the concrete cover.
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Reduced Durability: Corrosion accelerates the overall deterioration of the concrete, reducing the service life of the structure and increasing the need for repairs and maintenance.
Prevention and Mitigation:
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Proper Cover: Adequate concrete cover over the steel reinforcement helps protect it from exposure to moisture and chlorides. Design specifications should be followed to ensure proper cover thickness.
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Quality Concrete: High-quality, well-compacted concrete with low permeability reduces the ingress of moisture and chlorides, slowing down the corrosion process.
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Coatings and Sealants: Applying protective coatings or sealants on the concrete surface can provide an additional barrier against moisture and chlorides.
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Cathodic Protection: This technique involves applying a direct electrical current to the steel reinforcement to counteract the corrosion process. It is often used in combination with coatings.
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Use of Corrosion-Resistant Materials: Stainless steel or other corrosion-resistant alloys can be used for reinforcement in aggressive environments.
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Proper Drainage: Proper drainage systems should be in place to prevent the accumulation of water around the structure.
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Regular Inspection and Maintenance: Routine inspections and timely repairs can identify and address corrosion issues before they escalate.
Corrosion of steel in concrete structures is a complex phenomenon that requires careful consideration in design, construction, and maintenance practices. Addressing corrosion can help ensure the long-term durability and safety of concrete structures.
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