The Corrosion Performance of Weathering Steel in Highway Bridges PDF Download
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Author: M. McKenzie
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 37
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Book Description
Author: M. McKenzie
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 37
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Book Description
Author:
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 116
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Book Description
Author: Pedro Albrecht
Publisher: Transportation Research Board National Research
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 176
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Book Description
Author: American Iron and Steel Institute. Task Group on Weathering Steel Bridges
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 32
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Book Description
Author:
Publisher:
ISBN:
Category : Iron and steel bridges
Languages : en
Pages : 32
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Book Description
Author: Neal Damgaard
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Neal R. Damgaard
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Book Description
Weathering steel is a high-strength, low-alloy steel which has been proven to provide a significantly higher corrosion resistance than regular carbon steel. This corrosion resistance is a product of the small amounts of alloying elements added to the steel, which enable it to form a protective oxide layer when exposed to the environment. The main advantage of its use in bridges is that, under normal conditions, it may be left unpainted, leading to significantly reduced maintenance and environmental costs. Weathering steel has been a material of choice for highway structures for almost half a century, and a very large number of structures have been constructed with it. Although its use has for the most part been successful, it has also become evident that, in circumstances where there is the presence of salt and sulphur oxides, its performance is deficient. In these situations the corrosion penetration rate is much higher than expected, and the oxide layer forms in thick layers. This presents an added risk, since these layers flake off and fall onto the roadway. The degree of corrosion on structures can be very different, even if the structural type, location, and climate are similar. Therefore the focus of the thesis is on the lifespan of weathering steel highway structures. Primarily this research is concerned with the effect of corrosion on the integrity of these structures, as well as ways of quantifying corrosion loss and protecting the structure from further corrosion. In order to determine the lifespan of weathering steel highway structures subject to different rates of corrosion, a probabilistic structural analysis program has been developed to assess the time-dependent reliability of the structure. This program used iterative Monte Carlo simulation and a series of statistical variables relating to the material, loading, and corrosion properties of the structure. A corrosion penetration equation is used to estimate thickness loss at a selected interval, and the structural properties of the bridge are modified accordingly. The ultimate limit states of shear, moment, and bearing, and the fatigue limit state of web breathing, are taken into account. Three types of structures are examined: simply-supported box and I-girder composite bridges, and a two-span box girder bridge. Based on the structural analysis of the corroding bridge structures presented herein, it can be seen that corrosion to the weathering steel girders can cause reduced service lives of the structures. I-girder bridges are shown to be more susceptible to corrosion than box girder bridges, with continuous box girder bridges showing the best performance. The amount of truck traffic does not affect the reliability of the bridge. The short-span and high strength steel bridges are more susceptible to corrosion loss, primarily because their girders have thinner sections. A two-lane bridge also has better performance than the wider bridges because the weight of the barriers and sidewalks is carried by fewer girders, so these girders are stockier. The web breathing limit state is less significant than the combined ultimate limit states. Lastly, and most importantly, inspection data from a highway bridge is used to demonstrate the benefit that can be derived from using field data to update the time-dependent reliability. The ultrasonic thickness gauge (UTG) is a common tool for thickness measurement of steel sections. When used to measure weathering steel, this instrument provides accurate data about the depth of corrosion pits, but not their lateral dimensions. The measurement does not include the corrosion layer on the opposite side of the plate from the one being measured; however, if the corrosion layer is on the measured face, a disproportionate increase in the measured thickness can be seen. In order to prevent or minimize corrosion loss, the steel is currently painted, a process with several environmental and financial disadvantages. Therefore, three novel protection methods have been assessed in a cyclic corrosion test: a zinc metallizing, an aluminum-zinc-indium alloy metallizing, and a zinc tape with a PVC topcoat. All these coatings are designed to act not just as barriers, but also as sacrificial anodes. The test was run for 212 24-hr cycles, over the course of which the all the coatings were proven effective at protecting the steel substrate, regardless of steel type and surface roughness and pretreatment. In conclusion, the threat to all types of weathering steel highway structures by contaminant-induced corrosion is significant, but inspection data permits a more accurate prediction of time-dependent reliability for a structure, and protective coatings are a promising method of slowing the advance of corrosion.
Author: S. Frondistou-Yannas
Publisher:
ISBN:
Category : Bridges, Iron and steel
Languages : en
Pages : 116
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Book Description
Data have been collected and analyzed on the rates of deterioration and the repainting costs for structures with various coatings in four exposure environments. A simulation computer model has been built to analyze and predict corrosion and maintenance costs. This model can be used to derive the optimal painting schedule for a specific coating, the optimal protection method for a specific bridge, or a detailed analysis of costs for a single painting job or an entire maintenance program. Preprogrammed or user-furnished data may be utilized.
Author: Megan B. Conrad
Publisher: ProQuest
ISBN: 9781109121209
Category :
Languages : en
Pages : 90
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Book Description
In 2007, the Federal Highway Administration initiated a program to develop an improved corrosion resistant steel for highway bridge construction. The ATLSS Center (Advanced Technology for Large Structural Systems) at Lehigh University in Bethlehem, PA was contracted to implement a series of investigations to develop copper-nickel precipitation-strengthened weathering steels with similar or improved weldability and toughness to high performance grade steels as well as enhanced corrosion resistance without the need of protective coating systems. The corrosion properties of the developmental steels were investigated based on electrochemical surface potential and mass loss measurements after exposure of the alloys to accelerated cyclic corrosion protocols in order to discover the effects of elemental additions on the corrosion-products of weathering steel such that a new improved steel composition for highway bridges can be proposed.
Author: M. McKenzie
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 40
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Book Description
