Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Concrete cover"”.
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Confinement Limits For Tensile Lap Splices Under Static Loading
… splitting action is recognized by the American Concrete Institute (ACI 318-89) and the design recommendations of the ACI Committee 408, on which the American code provisions are partially based. However, a limit exists on the benefit that can be derived from this confinement. In Canada, CSA …
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Effect of Severe Corrosion on Lateral Strength of Square RC Bridge Columns
… problem that causes degradation of reinforced concrete structures located in aggressive environments. Severe corrosion of steel bars decreases the lateral load-carrying capacity of reinforced concrete members, causes loss in the mechanical properties of reinforcement and cross-sectional area of …
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Effect of Corrosion on the Behavior of Reinforced Concrete Beams Subject to Blast Loading
Corrosion of reinforcing steel embedded in concrete due to the presence of moisture, aggressive chemicals, inadequate cover, and other factors can lead to deterioration that substantially reduces the strength and serviceability of the affected structure. Accounting for corrosion degradation is …
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Bond Strength and Development Length of Sand-Coated GFRP Bars Spaced and Bundled in Normal Strength and Ultra-High-Performance Fibre-Reinforced Concrete
… into ultra-high- performance fibre-reinforced concrete (UHPFRC) with 2% steel fibres. It also examines the Ld of sand-coated #5 GFRP bars bundled in two and three embedded into normal strength concrete (NSC). Both studies followed the RILEM RC5 standard notched beam bond test method. For the …
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Analysis and Design of Steel Deck-Concrete Composite Slabs
… a longer span and better interaction with the concrete slab are investigated. Two new mechanical based methods for predicting composite slab strength and behavior are introduced. They are referred to as the iterative and direct methods. These methods, which accurately account for the …
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Optimization of Reinforced Concrete Structures
… is presented for the design of reinforced concrete structures. The design variables are the overall depth, effective depth and width of members, and area of longitudinal reinforcement. In addition, the details such as the amount of web reinforcement and cutoff points of longitudinal …
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Life cycle cost design of concrete structures
… based procedure for the design of reinforced concrete structural elements is presented in this thesis. The design procedure attempts to integrate structural performance and durability together with economic cost optimization into the structural design process. The evaluation of structural …
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A study of anchorage capacities of confined bent-bar reinforcement
… reinforcing bars in joints of reinforced concrete structures were examined. Ten full scale specimens simulating an exterior beam-column joint in a structure were tested in order to evaluate the anchorage capacity of the beam bars subjected to varying degrees of confinement and bent to …
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Deterioration and Cracking in Reinforced Concrete Bridges
Reinforced concrete structures are subjected to several sources of deterioration that can cause a progressive reduction in performance. Among the existing infrastructure typologies, reinforced concrete half-joint bridges are particularly critical. This common structural configuration is …
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A framework towards the design of more sustainable concrete structures
… a novel framework for the design of reinforced concrete (RC) structures which aims at ensuring that future RC structures have the lowest possible carbon footprint, energy use and impact on the environment. The key focus of the study is on structural design where there is a lack of grasp of …
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New developments in steel reinforcement protection from corrosion
… than 75 years. The practical use of adequate concrete cover, low water/cement ratio, and corrosion inhibitors and admixtures are not enough to satisfy this requirement. Corrosion still affects the reinforcing steel through the diffusion of chlorides. The steel reinforcement, the last line of …
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Modeling the Time-to Corrosion Cracking of the Cover Concrete in Chloride Contaminated Reinforced Concrete Structures
… corrosion in chloride contaminated reinforced concrete and time-to-corrosion cracking were investigated in this study. Sixty specimens were designed with seven admixed chloride contents, three concrete cover depths, two reinforcing steel bar diameters, two exposure conditions, and a typical …
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Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks
… the corrosion potential of reinforcing steel in concrete bridge decks. The technique is particularly useful because it can be utilized to evaluate the probability of corrosion before damage is evident at the surface of a bridge deck. The specific objective of this research was to quantify the …
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Effect of Environmental Conditions and Structural Design on Linear Cracking in Virginia Bridge Decks
… the primary cause of premature deterioration in concrete bridge decks (Brown, M.C., 2002). Since linear cracking in concrete cover can potentially accelerate chloride ingress to the depth of the reinforcing steel, there is reason to believe that severity of deck cracking can significantly …
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Corrosion rates and the time to cracking of chloride contaminated reinforced concrete bridge components
… pressure is exerted on the surrounding concrete to cause cracking. This study is a continuation of a study implemented in the Materials Division at Va Tech. The study includes the monitoring of the corrosion rate of steel reinforcing bars placed in simulated bridge decks. The corrosion …
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Shear Strength Assessment of Corrosion-Damaged Prestressed Concrete Girders
Corrosion is a concern in old prestressed concrete bridges, especially bridges built in marine environments. Corrosion induces cracks in the concrete superstructure which accelerates the deterioration rate and can result in a complete loss of the concrete cover and exposure of the reinforcing and …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
Corrosion of reinforcing steel in concrete is a significant problem around the world. In the United States, there are approximately 600,000 bridges. From those bridges 24% are considered structurally deficient or functionally obsolete based on the latest, December 2010, statistic from the Federal …
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Strengthening Damaged Reinforced Concrete Beams and Slender Columns Using Ultra-High Modulus CFRP Plates
… (CFRP) plates to strengthen damaged reinforced concrete beams and slender columns. In the first phase, two different pre-repair loading histories were simulated in seven 3000x300x150 mm reinforced concrete beams, namely cracking within the elastic range, and overloading in the plastic range. …
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Fibre cement boards as permanent formwork for reinforced concrete elements
… time-consuming activity in the construction of concrete structures. A significant factor in the construction's time and cost components is the use of temporary formwork systems which have reusability limitations. Permanent formwork provides an alternative type of formwork that remains in place …
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Time-dependent response of flat plate structures under high sustained load
Reinforced concrete (RC) structures may be exposed to high levels of sustained stresses resulting from errors in construction or design, abnormal loading, and material degradation. Although most RC structures are designed to withstand service level load with a large safety factor, errors may cause …
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