2 edition of Prestressed concrete durability & corrosion found in the catalog.
Prestressed concrete durability & corrosion
Martin E. Moss
|Statement||by Martin E. Moss.|
|Contributions||Montana. State Highway Commission. Planning Survey Section., United States. Bureau of Public Roads.|
|LC Classifications||TA445 .M838|
|The Physical Object|
|Pagination||ix, 217 p.|
|Number of Pages||217|
|LC Control Number||67064758|
Description: Prestressed concrete decks are commonly used for bridges with spans between 25m and m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Abstract: Prestressed concrete structures are prone to corrosion of prestressing strands in aggressive environments; and because these strands operate at a high level of stress their corrosion represents a greater concern because of brittle fracture associated with stress corrosion cracking and hydrogen embrittlement.
Guidance on the requirements to achieve durable post-tensioned concrete structures can be found in a number of publications, including the design manual published by the Highways Agency (a, b) and the book by the Comité Euro-International du Béton (). Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web National Cooperative Highway Research Program, Project , FY • Bearing Zone Cracking of Precast Prestressed Girders Due to Sliding Friction Kahn, Georgia Institute of Technology, & Kelly, Pruitt Eberly Stone Inc. • Guide for Maintenance of Concrete Bridge.
crete is generally more durable than cast-in-place concrete and that this durability is a result of precast concrete’s inher-ent manufacturing quality controls. Manufactured precast, prestressed concrete is of higher quality because the cover depth and concrete quality are ensured through accurate plant Fig. 3. Corrosion-induced deterioration. systems help improve the service life of prestressed. concrete bridges by protecting post-tensioning tendons from corrosion and enabling. long-term monitoring and inspection of their condition. Prestressed concrete is frequently used worldwide in infrastructure construction and offers considerable advantages over conventional reinforced concrete.
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Further, the amount of chloride known to initiate corrosion in prestressed strands is around 50% of that of conventional reinforcement, with concern for active pitting corrosion if chloride levels at the steel depth exceed % Cl/wt cmt (~%Cl/wt concrete).
Once strand corrosion has commenced, the corrosion is commonly to multiple wires in. This book focuses on the chloride and carbonation induced corrosion of steel in concrete, presenting transport mechanisms and electrochemical concepts.
Other types of corrosion of steel and degradation of concrete are also treated. The main emphasis lies on design and execution aspects related to durability of new and existing structures. Reinforced concrete has been developed and applied extensively in the 20th combines the good compressive strength of concrete with the high tensile strength of steel and has proven to be successful in terms of structural performance and durability.
However, there are instances of premature failure of reinforced concrete and prestressed concrete components due to corrosion 2/5(3). The book examines the different aspects of corrosion of steel in concrete, starting from basic and essential mechanisms of the phenomenon, moving up to practical consequences for designers, contractors and owners both for new and existing reinforced and prestressed concrete by: The durability of prestressed concrete is principally determined by the level of corrosion protection provided to any high-strength steel elements within the prestressing tendons.
Also critical is the protection afforded to the end-anchorage assemblies of unbonded tendons or cable-stay systems, as the anchorages of both of these are required to. Two series of small prestressed slabs were tested for freeze-thaw durability, scaling, and for ingressing salt ion corrosion of the encased strands.
The stress Prestressed concrete durability & corrosion book used were: zero psi, psi, and psi. Lau, I. Lasa, in Corrosion of Steel in Concrete Structures, Abstract.
Prestressed concrete is a viable building system for bridges, offering engineers and owners flexibility in bridge design and public use. Despite its advantages and general good use, documented corrosion durability problems continue to illustrate difficulties in bridge applications. Bernhard Elsener, a materials scientist and PhD in corrosion, is Professor for Materials Science at the Faculty of Engineering at the University of Cagliari (Italy) and a lecturer at ETH Zurich.
He is an internationally well-known expert on the durability of reinforced and prestressed concrete structures. Corrosion of this rebar caused spalling on a concrete step. The corrosion of reinforcing steel can be a problem in concrete structures.
Corrosion of steel produces hydrated iron oxide or rust, which is very expansive. This expansion builds up internal pressure until the concrete fails in the form of spalling.
Corrosion durability problems encountered during the modern application of prestressed concrete highlight the need for the holistic consideration of: manufacturing and building economics, structural design, materials performance and durability, construction practices, attainable construction quality, and maintenance tools to ensure the success.
The book examines the different aspects of corrosion of steel in concrete, starting from basic and essential mechanisms of the phenomenon, moving up to practical consequences for designers, contractors and owners both for new and existing reinforced and prestressed concrete structures.
Prestressed And Post-tensioned Concrete Concerns About Durability Of Reinforced Concrete Corrosion Of Steel Reinforcement In Concrete Chloride-induced Corrosion Carbonation-induced Corrosion Leaching-induced Corrosion Stray And Interference Current-induced Corrosion Conclusions References.
Sika® CNI is a corrosion-inhibiting admixture that provides protection against corrosion in reinforced concrete structures. Sika® CNI: Extends the service life of reinforced concrete structures.
Is recommended for use in all types of reinforced concrete, precast and/or prestressed concrete as well as ready mix applications. He is an internationally well-known expert on the durability of reinforced and prestressed concrete structures.
His extensive research work and numerous publications focus on non-destructive methods to detect and quantify corrosion, the use of new electrically isolated post-tensioning tendons and electrochemical restoration techniques.
The first of the book's two sections deals with materials and techniques for prestressed concrete, including the latest recipes for high-strength and durable concrete mixes, new reinforcing materials and their placement patterns, modern prestressing systems, and special techniques such as lightweight concrete and composite construction.
Additionally, deterioration of embedded prestressing reinforcement in these structures may not necessarily be made visible through manifestation of external distress in the concrete. Initiating mechanisms and particular forms of corrosion affecting prestressed concrete structures are described based on the author's experience.
Deterioration mechanisms are discussed, including hydrogen embrittlement and stress-corrosion cracking. Methods to protect prestressing steel against corrosion in new construction are presented, along with a discussion of field performance of prestressed concrete structures.
Finally, field evaluation and remediation techniques are presented. Advantages of prestressed concrete. Prestressed concrete is one of the most reliable, durable and widely used construction materials in building and bridge projects around the world. It has made significant contributions to the construction industry, the precast manufacturing industry and the cement industry as a whole.
Repair of Precast, Prestressed Concrete Bridge Products.7 The objective of the report was to achieve a greater degree of uniformity among owners, engineers, and precast con-crete producers with respect to the evaluation and repair of precast, prestressed concrete bridge beams.
The report recognizes end-of-beam cracking in Troubleshooting, Item 4. author of papers and books and as a foremost expert in the innovational designs of offshore-prestressed •Full consideration of the stages of construction of a prestressed concrete structure •Durability with regard to long-term performance and serviceability Corrosion-inhibiting admixtures, retarding admixtures, pumping aids, and.
Prestressed concrete tanks reinforced with P-T tendons to actively reinforce the structure and significantly enhance watertightness and long-term durability. Learn More Corrosion .the Precast/Prestressed Concrete Institute (PCI),1 because elements are cast and cured under factory-controlled conditions, precast concrete tends to exhibit better consistency, higher quality, and greater long-term durability than concrete fabri-cated on-site.
Unfortunately, precast concrete structures (Fig. 1).The problem we are trying to solve is the condition assessment of corroded prestressed concrete (PC) bridge girders in New England. The problem is important because that PC bridge girders are a critical component of highway bridges.
a data-driven method. The outcome can be customized improve the durability of PC bridges through effective.