Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sealing of Cracks on Florida Bridge Decks with Steel Girders, Summary Report
One of the biggest problems affecting bridges is the transverse cracking and deterioration of concrete bridge decks. The causes of early age cracking are primarily attributed to plastic shrinkage, temperature effects, autogenous shrinkage, and drying shrinkage. The cracks can be influenced by material characteristics, casting sequence, formwork, climate conditions, geometry, vehicle loading, and time-dependent effects. The cracking of bridge decks not only creates unsightly aesthetic condition but also reduces deck durability. That can lead to corrosion problems of deck steel reinforcement and supporting steel girders (steel box girders and built-up steel girders). The lab testing, experimental field testing, and analytical study investigate the transverse cracking, especially early age cracking of bridge decks, and how to mitigate them. This research identifies suitable sealing materials for deck cracks showing their ability to span cracks of various widths and achieving performance criteria such as penetration depth, bond strength to crack walls, elongation, viscosity, penetration, and suitability of the type of sealant. Sealant performance was investigated by testing core samples to determine the depth of sealant penetration, bond, and tensile strength. Sealer samples were tested to verify their strength, modulus of elasticity, and elongation. A finite element model was developed to investigate the factors affecting tensile stresses and crack tendency. It also checks the live-load deflection limit, which is an important factor in bridge deck cracking. An Excel spreadsheet was also developed to predict the deck cracking accounting for shrinkage, thermal effect, creep, concrete mix design, deck restrain, loading, and environmental effects.
Sealing of Cracks on Florida Bridge Decks with Steel Girders, Summary Report
One of the biggest problems affecting bridges is the transverse cracking and deterioration of concrete bridge decks. The causes of early age cracking are primarily attributed to plastic shrinkage, temperature effects, autogenous shrinkage, and drying shrinkage. The cracks can be influenced by material characteristics, casting sequence, formwork, climate conditions, geometry, vehicle loading, and time-dependent effects. The cracking of bridge decks not only creates unsightly aesthetic condition but also reduces deck durability. That can lead to corrosion problems of deck steel reinforcement and supporting steel girders (steel box girders and built-up steel girders). The lab testing, experimental field testing, and analytical study investigate the transverse cracking, especially early age cracking of bridge decks, and how to mitigate them. This research identifies suitable sealing materials for deck cracks showing their ability to span cracks of various widths and achieving performance criteria such as penetration depth, bond strength to crack walls, elongation, viscosity, penetration, and suitability of the type of sealant. Sealant performance was investigated by testing core samples to determine the depth of sealant penetration, bond, and tensile strength. Sealer samples were tested to verify their strength, modulus of elasticity, and elongation. A finite element model was developed to investigate the factors affecting tensile stresses and crack tendency. It also checks the live-load deflection limit, which is an important factor in bridge deck cracking. An Excel spreadsheet was also developed to predict the deck cracking accounting for shrinkage, thermal effect, creep, concrete mix design, deck restrain, loading, and environmental effects.
Sealing of Cracks on Florida Bridge Decks with Steel Girders, Summary Report
A. ElSafty (Autor:in)
2012
1 pages
Report
Keine Angabe
Englisch
Highway Engineering , Construction Equipment, Materials, & Supplies , Bridge decks , Sealers , Concrete structures , Corrosion , Cracking(Fracturing) , Deflection , Deterioration , Durability , Finite element model , Florida , Girders , Modulus of elasticity , Reinforcing steels , Shrinkage , Temperature effects , Tensile strength , High molecular weight methacrylate (HMWM)
Partial Continuity in Bridge Girders with Jointless Decks
| British Library Online Contents | 2005