The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform
Venkat R Bhethanabotla - One of the best experts on this subject based on the ideXlab platform.
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predictive framework for frp concrete Corrosion Repair
Journal of Composites for Construction, 2020Co-Authors: Mohammad A Khawaja, Venkat R BhethanabotlaAbstract:Abstract Fiber-reinforced polymers (FRPs) have been used for Repairing chloride-induced Corrosion in steel for more than 40 years. Since FRP is a barrier element, it cannot stop electrochemical rea...
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Oxygen Permeability of FRP-Concrete Repair Systems
Journal of Composites for Construction, 2012Co-Authors: Chandra Khoe, Venkat R BhethanabotlaAbstract:Fiber reinforced polymers (FRP) are increasingly used for Repairing Corrosion-damaged concrete structures. The performance of the Repairs is critically dependent on the oxygen permeability of the FRP-concrete system. This paper presents the results of an experimental study in which the oxygen permeation of concrete and FRP-concrete systems were determined. In the study, concrete specimens with three different water-cementitious ratios were initially tested. Subsequently, uni directional one and two-layer carbon and fiberglass material were bonded to the concrete surface, and the oxygen permeation of the FRP-concrete systems were determined. The results showed a significant reduction in the oxygen permeation of concrete after FRP had been bonded. The best performance was obtained for FRP bonded to concrete with the highest water-cementitious ratio. An expression for the equivalent thickness of FRP-concrete systems was derived by using Fick’s law. This facilitates the evaluation of the effectiveness of alternate FRP-concrete Corrosion Repair schemes.
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Measurement of Oxygen Permeability of Epoxy Polymers
Aci Materials Journal, 2010Co-Authors: Chandra Khoe, Sanchari Chowdhury, Venkat R BhethanabotlaAbstract:This paper describes an experimental technique that refines and extends available methods to measure the oxygen permeability of polymers such as epoxies that cannot easily be prepared as thin films. A simple Fick’s law-based quasi-steady-state diffusion model was developed to extract the permeation coefficient from the experimental data. The validity of this technique was established by comparing results with published values. Tests were subsequently conducted to determine the oxygen permeation rates for five representative commercially available epoxy polymers. The results showed that the oxygen permeation rates for the different epoxies were comparable, making them all suitable for Corrosion Repair. This suggests that Repair costs may be optimized by selecting the most cost-effective epoxy system. The applicability of the findings is discussed and an illustrative numerical example is presented.
A. G. Stutheit - One of the best experts on this subject based on the ideXlab platform.
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Weld overlay chosen for Corrosion Repair at Texas CO sub 2 plant
Oil & Gas Journal, 1991Co-Authors: K. R. Ferguson, A. G. StutheitAbstract:This paper reports on the use of complete in situ weld overlay to Repair large process vessels in corrosive service that has proven cost effective and technically feasible. The dual units are located in a hot potassium carbonate CO{sub 2} treating plant located on the Sacroc unit near Snyder, Tex. The unit is operated by Chevron U.S.A. Inc. This procedure was performed in lieu of other Corrosion solutions or Repair alternatives that offered less security, worse economics, or both. Both vessels were reentered after at least 1 year of operation after Repair and were found to have excellent overlay integrity. Past industry experience in related Repair methods (such as strip lining) suggested ultimate failure is probable. Many refineries and gas treating and petrochemical facilities may be plagued by similar problems calling for relatively large and thorough retrofitting of such pressure vessels.
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Weld overlay chosen for Corrosion Repair at Texas CO "SUB 2" plant
OIL & GAS J., 1991Co-Authors: K. R. Ferguson, A. G. StutheitAbstract:The first part of a three part series examines the planning and management of complete in-situ weld overlay to Repair large process vessels in corrosive service. Corrosion was caused by increased carbon dioxide and hydrogen sulphide levels in the feed gas. Discusses choice of solution for the absorber column and carbonate piping. Options included hydrogen sulphide removal, replacement with stainless steel vessels, strip lining and the weld overlay. The first two were too expensive, and strip lining seemed susceptible to stress Corrosion cracking, leaving weld overlay as the final choice. (C.J.U.)
Muhammad Ali Baloch - One of the best experts on this subject based on the ideXlab platform.
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Repair vulnerability of Corrosion patch Repairs at the steel intersection areas of reinforced concrete slabs influenced by harsh weather
Industrial & Engineering Chemistry Research, 2014Co-Authors: Muhammad Wasim, Raja Rizwan Hussain, Muhammad Ali BalochAbstract:This paper aims at finding the effect of harsh weather on Corrosion Repair of reinforced concrete slabs at the rebar intersections. Concrete slabs were tested to get an insight into the existence of macro-cell phenomenon in the rehabilitated patches of the corroded reinforced concrete members and the durability of Repairs under the coupled effect of high constant humidity and high temperature. The specimens were prepared having a total chloride concentration in mixing water as 3% and 5% by mass of binder and the intersection steel areas simulating the patch Repairs that were kept uncontaminated. After two years of Corrosion potential observations, the specimens were broken to find the gravimetric mass loss and to get the true picture of the Corrosion of steel at the intersection of the Repaired patches of reinforced concrete.
K. R. Ferguson - One of the best experts on this subject based on the ideXlab platform.
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Weld overlay chosen for Corrosion Repair at Texas CO sub 2 plant
Oil & Gas Journal, 1991Co-Authors: K. R. Ferguson, A. G. StutheitAbstract:This paper reports on the use of complete in situ weld overlay to Repair large process vessels in corrosive service that has proven cost effective and technically feasible. The dual units are located in a hot potassium carbonate CO{sub 2} treating plant located on the Sacroc unit near Snyder, Tex. The unit is operated by Chevron U.S.A. Inc. This procedure was performed in lieu of other Corrosion solutions or Repair alternatives that offered less security, worse economics, or both. Both vessels were reentered after at least 1 year of operation after Repair and were found to have excellent overlay integrity. Past industry experience in related Repair methods (such as strip lining) suggested ultimate failure is probable. Many refineries and gas treating and petrochemical facilities may be plagued by similar problems calling for relatively large and thorough retrofitting of such pressure vessels.
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Weld overlay chosen for Corrosion Repair at Texas CO "SUB 2" plant
OIL & GAS J., 1991Co-Authors: K. R. Ferguson, A. G. StutheitAbstract:The first part of a three part series examines the planning and management of complete in-situ weld overlay to Repair large process vessels in corrosive service. Corrosion was caused by increased carbon dioxide and hydrogen sulphide levels in the feed gas. Discusses choice of solution for the absorber column and carbonate piping. Options included hydrogen sulphide removal, replacement with stainless steel vessels, strip lining and the weld overlay. The first two were too expensive, and strip lining seemed susceptible to stress Corrosion cracking, leaving weld overlay as the final choice. (C.J.U.)
Mohammad A Khawaja - One of the best experts on this subject based on the ideXlab platform.
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predictive framework for frp concrete Corrosion Repair
Journal of Composites for Construction, 2020Co-Authors: Mohammad A Khawaja, Venkat R BhethanabotlaAbstract:Abstract Fiber-reinforced polymers (FRPs) have been used for Repairing chloride-induced Corrosion in steel for more than 40 years. Since FRP is a barrier element, it cannot stop electrochemical rea...
