A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance Evaluation of Low Permeable Concrete Bridge Deck
Intrusion of water into the concrete matrix can act as a delivery mechanism for potentially harmful materials. These materials can accelerate corrosion of reinforcing steel in the concrete. Corrosion of the reinforcing steel occurs when chlorides, from deicing salts or cast-in-place chlorides, attack the steel. The corrosion reduces the cross-sectional area of the steel, which decreases the stiffness and strength of the structure. Corrosion of the steel also causes the concrete to crack because of increased volume due to rust. Another problem caused by water intrusion into the concrete matrix is expansion due to freezing. When water that has filled the air voids in the concrete is subjected to freezing temperatures, it turns to ice and expands. This increase in volume can cause the concrete to crack and lose strength. Steps can be taken to prevent corrosion of the reinforcing steel in concrete bridge decks. The North Dakota Department of Transportation (NDDOT) requires the use of epoxy coated reinforcing steel throughout the structure. Coating the steel with a protective layer is an excellent means to prevent corrosion, but it does not prevent the absorption of water and the consequent freezing and cracking that may occur. To do this, researchers find an acceptable concrete mix design that will lower the permeability of the concrete with no loss in strength.
Performance Evaluation of Low Permeable Concrete Bridge Deck
Intrusion of water into the concrete matrix can act as a delivery mechanism for potentially harmful materials. These materials can accelerate corrosion of reinforcing steel in the concrete. Corrosion of the reinforcing steel occurs when chlorides, from deicing salts or cast-in-place chlorides, attack the steel. The corrosion reduces the cross-sectional area of the steel, which decreases the stiffness and strength of the structure. Corrosion of the steel also causes the concrete to crack because of increased volume due to rust. Another problem caused by water intrusion into the concrete matrix is expansion due to freezing. When water that has filled the air voids in the concrete is subjected to freezing temperatures, it turns to ice and expands. This increase in volume can cause the concrete to crack and lose strength. Steps can be taken to prevent corrosion of the reinforcing steel in concrete bridge decks. The North Dakota Department of Transportation (NDDOT) requires the use of epoxy coated reinforcing steel throughout the structure. Coating the steel with a protective layer is an excellent means to prevent corrosion, but it does not prevent the absorption of water and the consequent freezing and cracking that may occur. To do this, researchers find an acceptable concrete mix design that will lower the permeability of the concrete with no loss in strength.
Performance Evaluation of Low Permeable Concrete Bridge Deck
K. Folland (author) / C. Moretti (author) / G. Johnson (author) / A. Abolmaali (author)
2004
105 pages
Report
No indication
English
Civil Engineering , Construction Equipment, Materials, & Supplies , Concretes , Bridge decks , Performance evaluation , Portland cements , Admixtures , Highway design , Fly ash , Test methods , Durability , Corrosion prevention , Slags , Cracks , North Dakota , Reinforcing steels , Freezing , Research projects , Coatings , Permeability
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