Parameters Governing The Corrosion Protection Efficiency Of Fusion Bonded Epoxy Coatings On Reinforcing Steel
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| Author | : |
| Publisher | : |
| Total Pages | : 67 |
| Release | : 2008 |
| Genre | : Cathodic protection |
| ISBN | : |
The purpose of this study was to investigate various epoxy coating and exposure parameters to determine their effects on the corrosion of reinforcing steel. The parameters investigated were: chloride content at the bar depth, coated bar corroded area, corrosion product color under the coating, epoxy coating adhesion, coating color, coating damage (holidays and holes), coating thickness, TGA, DSC and EDS analysis and SEM coating cracking investigation. This study demonstrated that the ECR coating samples extracted from concrete exhibited extensive cracking compared to the new ECR samples in which the coating cracking was limited to only one sample. The coating cracking correlated with the amount of chloride at bar level, residual adhesion of the epoxy to the steel surface, and the percent moisture in the coating. The coating cracking is also related to the change in color of the epoxy and indicates that the epoxy coating degradation in concrete influences the surface condition of the coating. The DSC results showed that both the extracted epoxy coating samples as well as new samples are not fully cured during the manufacturing process. Additionally, the extracted epoxy coated samples investigated presented significant permanent adhesion loss with little or no epoxy coating residue present on the bar surface, while the EDS analysis showed that once adhesion is lost, corrosion will proceed unimpeded under the coating even in the absence of chlorides. The parameters that presented a direct correlation with the observed corrosion activity were the number of holidays and the number of damaged areas per unit length of bar. The results also show a distinct loss of quality control in the handling and possibly storage of new coated bars. The new ECR samples had significantly higher damage density than the samples extracted from concrete, while there was no change in the number of holidays and cure condition.
| Author | : |
| Publisher | : |
| Total Pages | : 94 |
| Release | : 1992 |
| Genre | : |
| ISBN | : |
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 | : fib Fédération internationale du béton |
| Publisher | : fib Fédération internationale du béton |
| Total Pages | : 123 |
| Release | : 2009-01-01 |
| Genre | : Technology & Engineering |
| ISBN | : 2883940894 |
It has long been recognised that corrosion of steel is extremely costly and affects many industry sectors, including concrete construction. The cost of corrosion of steel reinforcement within concrete is estimated at many billions of dollars worldwide. The corrosion of steel reinforcement represents a deterioration of the steel which in turn detrimentally affects its performance and therefore that of the concrete element within which it has been cast. A great amount of work has been undertaken over the years concerning the prevention of corrosion of steel, including the application of coatings, which has included the study of the process of corrosion itself, the properties of reinforcing steels and their resistance to corrosion as well as the design of structures and the construction process. The objective of fib Bulletin 49 is to provide readers with an appreciation of the principles of corrosion of reinforcing steel embedded in concrete and to describe the behaviour of particular steels and their coatings as used to combat the effects of such corrosion. These include galvanised reinforcement, epoxy coated reinforcement, and stainless reinforcing steel. It also provides information on the relative costs of the materials and products which it covers. It does not deal with structure design or the process of construction or with the post-construction phase of structure management including repair. It is hoped that it will nevertheless increase the understanding of readers in the process of corrosion of reinforcing steels and the ability of key materials and processes to reduce its harmful effects.
| Author | : Kenneth C. Clear |
| Publisher | : Transportation Research Board |
| Total Pages | : 164 |
| Release | : 1995 |
| Genre | : Bridges, Iron and steel |
| ISBN | : 9780309053709 |
| Author | : WM. Elleithy |
| Publisher | : |
| Total Pages | : 6 |
| Release | : 1998 |
| Genre | : Adhesion |
| ISBN | : |
Fusion-bonded epoxy coating is extensively used to enhance the corrosion resistance of reinforcing steel. The bond strength between these bars and the concrete is expected to be less than that of the uncoated bars and it may be further impaired due to prolonged exposure to thermal variations. This investigation was conducted to evaluate the effect of thermal variations, simulating the changes in the night to day temperature, on the bond strength of fusion-bonded epoxy-coated steel reinforcement. The pull-out specimens, prepared using bars of two different sizes and two coating thickness, were exposed to thermal cycling. The critical and ultimate bond strength of the fusion-bonded epoxy-coated bars were compared with that of the uncoated bars. The results indicated a reduction in the critical bond strength between concrete and the fusion-bonded coated bars. Furthermore, the difference between the critical bond strength in the coated and uncoated bars decreased with increasing thermal cycles, indicating that thermal variation has a greater effect on bond strength than the coating thickness.
| Author | : |
| Publisher | : |
| Total Pages | : 288 |
| Release | : 2008 |
| Genre | : Concrete |
| ISBN | : |
| Author | : Kenneth C. Clear |
| Publisher | : |
| Total Pages | : 94 |
| Release | : 1992-11-01 |
| Genre | : Epoxy coatings |
| ISBN | : 9781895102901 |
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 | : Ricardo Rafael De Rojas Pando De Rojas |
| Publisher | : |
| Total Pages | : 114 |
| Release | : 2001 |
| Genre | : |
| ISBN | : |
| Author | : NACE International |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 1999 |
| Genre | : Corrosion and anti-corrosives |
| ISBN | : 9781575900797 |
| Author | : S.Amutha Subramaniam |
| Publisher | : |
| Total Pages | : 172 |
| Release | : 2005 |
| Genre | : Corrosion |
| ISBN | : |
The principal cause of degradation of steel reinforced structures is corrosion damage to the rebar embedded in the concrete. The two most common causes of reinforcement corrosion are chloride ions and carbonation. The scale of this problem has reached alarming proportions in various parts of the world. Thus, a lot of money being spent on the rehabilitation of concrete structures i.e. bridges, marine structures etc. In realizing this crucial situation, the corrosion protection methods were emphasized widely in the past. However, the proposed methods somehow failed to be implemented widely due to various factors. Hence this project is trying to look into the potential corrosion protection method on reinforcement steel. Laboratory tests were carried out using small reinforced concrete beam specimens exposed to different corrosive environment namely tap water, chloride, tap water accelerated, marine accelerated and acidic accelerated. Out of total 10 numbers of specimens, 5 specimens contain reinforcement painted with epoxy-coating (Nitoprime Zincrich) having coating thickness of 40 11m. Acceleration tests were carried out on 60% of the specimens to expedite the various environmental effects on the specimens. From the study, it is apparent that coating the reinforcement prior to placing inside concrete plays a key role in protecting the reinforcement from corrosion. However, one needs to study the environment prior to choosing the suitable coating material.
