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 74 for “"rebar"”.
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Alternative patch repair materials for rebar corrosion damage
Reinforced concrete (RC) is extensively used in the construction industry. It is particularly used to guarantee that infrastructure assets around the world last for multiple years whilst ensuring that the structural integrity and serviceability of the structure is maintained. However, in practice …
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An innovative technology in concrete construction--semi-automated rebar tying
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1991.
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Monitoring Corrosion of Rebar Embedded in Mortar Using Guided Ultrasonic Waves
Results are presented and discussed within the framework of a corrosion process degradation model and service life. A thorough review and discussion of the corrosion process, modeling the propagation of corrosion, nondestructive methods for monitoring corrosion in reinforced concrete, and guided …
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Reliability model for ductile hybrid frp rebar using randomly dispersed chopped fibers
<p>RELIABILITY MODEL FOR DUCTILE HYBRID FRP REBAR USING RANDOMLY DISPERSED CHOPPED FIBERS</p> <p>Fiber reinforced polymer composites or simply FRP composites have become more attractive to civil engineers in the last two decades due to their unique mechanical properties. However, there are many …
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Case study of the conglomerate bankruptcy scandal in Taiwan (The Rebar Group)
… financial risks in companies. For example, the Rebar Group's bankruptcy case in 2007 caused severe financial turmoil in Taiwan and drew people's attention to affiliated companies. My research will focus on the context of the Rebar Group's bankruptcy case and the lessons we can learn from the …
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Lap Splice Development Length of Rebar in Stabilized Hollow Interlocking Compressed Earth Blocks
… proportions of soil, sand, cement, and water. Rebar bar sizes were restricted to M10 (#3) and M13 (#4) for all lap splice specimens due to the limited area of the hollow 2-inch diameter rebar cavity of the ICEB unit. The limited size and strength of the ICEB units also made the use of larger …
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Development of measurement techniques for evaluation of inhibitors for controlling rebar corrosion in concrete
… In a first time, five specimens with different rebar networks were cast in order to study the effects of the rebar network on corrosion. Half-cell potential measurements were used to monitor the corrosion behavior of each specimen. In a second time, calcium nitrite, monofluorophosphate and …
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Effect of anti-corrosive coatings on the bond between corrosion-damaged rebar and concrete repair materials
… However, information on how well the coated rebar bonds to the new surrounding repair concrete is limited. Hence, developing an understanding on the bond performance of repaired coated rebar is important for engineers in the construction repair industry. One commercially available …
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Residual Engineering Properties of Corroded Conventional Steel, High Chromium Steel and Stainless Steel Reinforcing bars in Concrete
… in the engineering properties of corroded steel rebar. This work presents the findings of the experimental study of the effect of corrosion on the engineering properties of conventional and common resistant corrosion steel rebar that are commonly used in reinforced concrete structures. Sets of …
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Review of current practices to reduce reinforcement corrosion in concrete structures managed by the City of Cape Town
… structures against concrete deterioration and rebar corrosion have become far more important for road authorities and asset managers. City Engineers are responsible for the repair and rehabilitation of RC structures in different exposure conditions, by identifying the type of deterioration and …
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Mechanical Properties of Polymer Modified Mortar
… an isopthalic polyester matrix material. The FRP rebar was compared to standard steel rebars, and found that the standard steel corrugated rebar had a higher adhesive strength, due to mechanical interlocking. This was clarified by measurements using a smooth steel rebar. Characterization of the …
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Shear Strength and Strength Degradation of Concrete Bridge Decks with GFRP Top Mat Reinforcement
… during which data was collected on deflections, rebar strain, crack widths, and ultimate load. It was concluded that the existing equations, particularly the guidelines of ACI 440, are grossly over-conservative for GFRP-reinforced concrete bridge decks continuous over multiple supports. It was …
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Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete
… the chemical treatment of the partially exposed rebar through ponding and/or placement of chemically treated mortar. Reinforced concrete specimens were cast and subjected to repeated exposure to NaCl solution. Half-cell potential, corrosion rate, and chloride ion concentration measurements were …
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Reliability-based performance assessment and optimum maintenance of corroded reinforced concrete structures
… evaluating concrete crack evolution, estimating rebar bond strength degradation and predicting residual flexural strength of concrete structures affected by reinforcement corrosion. At first, cracking in cover concrete due to reinforcement corrosion is investigated by using rebar-concrete model …
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Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks
… potentials were also obtained for epoxy-coated rebar in this research. The results of the testing indicated that all of the factors except for cover thickness and spatial position have important impacts on half-cell potentials over the ranges of levels investigated in this research. Half-cell …
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Examination of flexural crack width prediction in concrete: comparison of analytical and numerical models
… harmful ions to reach and then react along the rebar length. A reliable prediction method should therefore account for the loss of bond in crack propagation. Researchers question the significance of the role played by surface cracks in structural deterioration, therefore casting doubt on the …
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Blast Performance of Hybrid GFRP and Steel Reinforced Concrete Beams
… use of blended mixtures of FRP and steel rebar as tensile reinforcement promises to address these limitations through self-centering behavior that provides reductions in residual damage and enhancements in flexural performance. This thesis presents the results of an experimental and …
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Bond between reinforcing bars and concrete under impact loading
… also investigated. It was found that for smooth rebars, there existed a linear bond stress-slip relationship under both static and high rate loading. Different loading rates, compressive strengths, types of fibres, and fibre contents were found to have no great influence on this relationship and …
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Implementing Continuous Fiber Reinforcement for Concrete Additive Manufacturing
… 3D printing mainly consists of manually adding rebar into cavities created during the printing process (Mechtcherine et al., 2018). Since the rebar has to be cast into place by hand, many of the benefits of having an autonomous process are reduced. This project designed an extruder for a …
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Automating Bridge Inspections Using Prompt-Based Change Detection
… for spalling, rust, graffiti, and exposed rebar. In-domain training (bridge-specific imagery) yields substantial gains, and including artifact-based “before” images enhances robustness to view-synthesis seams and shading, with visible benefits for rust and exposed rebar. Our main …
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