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Author: V. K. Raina
Publisher: Tata McGraw-Hill Publishing Company
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 572
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Book Description
A guide to inspecting, maintaining, and rehabilitating various types of concrete and composite bridges. It also discusses emergency measures you can take to keep bridges operating safely until they can be rehabilitated. It provides civil and structural engineers with methods for conducting safety inspections, condition surveys, and more.
Author: V. K. Raina
Publisher: Tata McGraw-Hill Publishing Company
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 572
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Book Description
A guide to inspecting, maintaining, and rehabilitating various types of concrete and composite bridges. It also discusses emergency measures you can take to keep bridges operating safely until they can be rehabilitated. It provides civil and structural engineers with methods for conducting safety inspections, condition surveys, and more.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Book Description
The primary function of an epoxy coating is to act as a barrier to prevent corrosion-causing chloride ions and oxygen from reaching steel surfaces. For more than a decade, epoxy-coated reinforcing steel has generally been effective in reducing or preventing chloride-induced corrosion in bridges and other concrete structures. Recently, however, instances of corrosion problems or premature failures in Florida, Oregon and New York have focussed attention on the product and its quality. This report was initiated as a result of the questions raised by these failures. In the first section of the report, a state of the art review of epoxy-coated reinforced steel is presented. It details the research performed on epoxy coating, and the results of this research both in the lab and in the field. As well, the authors highlight several areas to be considered for future investigation. The second section examines the fundamentals of epoxy, and the coating process. It provides an overview of the theory, technology, testing and practice as these presently exist for fusion bonded epoxy coatings on steels. The significance of the tests available for use on epoxy-coated rebars and epoxy-coated pipe is described. The report contains numerous figures.
Author: Wioleta A. Pyć
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 58
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Book Description
We used a simulated concrete pore water solution to evaluate the corrosion protection performance of concrete corrosion-inhibiting admixtures and epoxy-coated reinforcing bars (ECR). We evaluated three commercial corrosion inhibitors, ECR from three coaters removed from job sites, one ECR shipped directly from the coater's plant, and one ECR removed from a job site plus a corrosion inhibitor. The corrosion inhibitors were calcium nitrite, an aqueous mixture of esters and amines, and a mixture of alcohol and amine. Corrosion protection performance was based on the amount of visually observed corroded surface area. For bare steel tested with and without corrosion inhibitors, corrosion increased with increasing chloride concentration, and specimens saturated with oxygen were more corroded than specimens saturated with breathing air. The amount of corrosion over the 90-day test period was controlled by the amount of oxygen in solution at the higher chloride concentrations. The ester-amine and alcohol-amine did not inhibit corrosion. Calcium nitrite inhibited corrosion at all levels of chloride concentration. For ECR, corrosion occurred both at sites where the coating was damaged and underneath the coating. Coating debondment was greatest in pore water solutions containing chloride. The least coating debondment and corrosion occurred in the solution containing calcium nitrite and the ECR shipped directly from the manufacturer. Coating debondment and corrosion of ECR are directly related to the amount of damage as holes; mashed, dented, and cracked areas; and holidays. The researchers recommend that the developed test method be adopted as a standard test for concrete corrosion inhibitors and that calcium nitrite remain the only concrete corrosion inhibitor approved for use in Virginia.
Author: Kenneth C. Clear
Publisher:
ISBN: 9781895102901
Category : Epoxy coatings
Languages : en
Pages : 94
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Book Description
The primary function of an eposy-coating is to act as a barrier to prevent corrosion-causing chloride ions and oxygen from reaching steel surfaces. For more than a decade, epoxy-coated reinforcing steel has generally been effective in reducing or preventing chloride-induced corrosion in bridges and other concrete structures. Recently, however, instances of corrosion problems or premature failures in Florida, Oregon and New York have focussed attention on the product and its quality. This report was initiated as a result of the questions raised by these failures.
Author: S. Ray Taylor
Publisher:
ISBN:
Category : Epoxy coatings
Languages : en
Pages : 66
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Book Description
Epoxy coating is widely used to mitigate the access of chloride ions to the surface of a rebar. However, corrosion at the point of physical defects in the coating necessitates rehabilitation. Based on its effectiveness in mitigating corrosion of uncoated rebars, we examined cathodic protection (CP) as a method for rehabilitating epoxy-coated rebars (ECR). Although it is well established that cathodic polarization of epoxy coatings on steel in aqueous conditions leads to disbondment of the coating, neither the conditions that lead to this phenomenon nor the actual occurrence of this disbondment process has been determined for ECR in concrete. Since the integrity of the bond between the rebar and the concrete is essential to the composite strengthening by the rebar, the relationships among CP, the integrity of the epoxy coating, and the strength of the rebar/concrete bond must be investigated. The objectives of this study were (1) to determine if CP can effectively mitigate corrosion of coated rebar without adversely affecting the rebar/concrete interface, and (2) to examine the effect of cathodic polarization on the disbonding characteristics of the epoxy coating/rebar interface in concrete. Fifty-five samples of No. 5 ECR with coating defects were exposed to CP. Tensile loading produced splitting failures of all samples. This mode of failure allows greater sensitivity to the contributions of concrete/rebar adhesion and friction than do pullout failures. All electrochemical tests indicated that the cathodic polarization levels and times of application used in this study were effective in preventing corrosion of embedded ECR. An important finding was that the CP protection levels and times had no effect on the splitting failure characteristics based on comparisons of 95 percent confidence intervals. Multiple parameters within the electrochemical impedance spectra indicated that the epoxy coating was delaminating from the steel at the periphery of the defects. This phenomenon was verified in a post mortem analysis of the samples using scanning electron microscopy. The immediate significance of this result is that CP current demands could increase over time. Even though the levels of delamination in this study did not affect mechanical performance, a protective CP level that does not induce film delamination should be explored.
Author: M Raupach
Publisher: Woodhead Publishing
ISBN: 1845692284
Category : Technology & Engineering
Languages : en
Pages : 337
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Book Description
Given the widespread use of reinforced concrete in infrastructure, understanding the corrosion of this material is of major importance. As a result there has been a wealth of research into catalysts, inhibitors and effective means of monitoring the rate of corrosion. Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques summarises some of the most significant research and its implications.The book begins by reviewing findings from various experiments designed to test the corrosion rate of metals induced by a range of factors. Later chapters discuss techniques for monitoring and testing for corrosion. The book concludes by assessing important methods of prevention, including corrosion inhibitors, protective coatings and electrochemical methods for protection, together with rehabilitation procedures for susceptible structures.Filled with practical examples and written by a distinguished team of international contributors, Corrosion of reinforcement in concrete: mechanisms, monitoring, inhibitors and rehabilitation techniques is an essential reference for civil engineers using reinforced concrete. - Summarises research into catalysts, inhibitors and effective means of monitoring the rate of corrosion - Concludes by assessing important methods of prevention
Author: Kenneth C. Clear
Publisher: Transportation Research Board
ISBN: 9780309053709
Category : Technology & Engineering
Languages : en
Pages : 164
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Book Description
Author:
Publisher:
ISBN:
Category : Reinforced concrete
Languages : en
Pages : 94
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Book Description
Author: J. Mietz
Publisher: CRC Press
ISBN: 1000122433
Category : Science
Languages : en
Pages : 226
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Book Description
This book compiles the full papers presented in the successful session "Corrosion of Steel in Concrete" at EUROCORR '97. It highlights the areas of technical development in this field, including monitoring of steel reinforcement corrosion, prevention of corrosion and electrochemical repair methods.
Author: FIB – International Federation for Structural Concrete
Publisher: FIB - International Federation for Structural Concrete
ISBN: 1874266263
Category : Technology & Engineering
Languages : en
Pages : 52
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Book Description
