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Nchrp 10 37 Performance Of Epoxy Coated Reinforcing Steel In Highway Bridges
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Book Synopsis NCHRP 10-37, Performance of Epoxy-coated Reinforcing Steel in Highway Bridges by : KCC Inc
Download or read book NCHRP 10-37, Performance of Epoxy-coated Reinforcing Steel in Highway Bridges written by KCC Inc and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Epoxy-coated Reinforcing Steel in Highway Bridges by : Kenneth C. Clear
Download or read book Performance of Epoxy-coated Reinforcing Steel in Highway Bridges written by Kenneth C. Clear and published by Transportation Research Board. This book was released on 1995 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of Epoxy-coated Reinforcing Steel in Highway Bridges by :
Download or read book Performance of Epoxy-coated Reinforcing Steel in Highway Bridges written by and published by . This book was released on 1995 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Bridge Engineering by : Joan R. Casas
Download or read book Recent Advances in Bridge Engineering written by Joan R. Casas and published by . This book was released on 1996 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Summary of Progress - National Cooperative Highway Research Program by : National Cooperative Highway Research Program
Download or read book Summary of Progress - National Cooperative Highway Research Program written by National Cooperative Highway Research Program and published by . This book was released on 2009 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress Report by : National Cooperative Highway Research Program
Download or read book Progress Report written by National Cooperative Highway Research Program and published by . This book was released on 2002 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 2006 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis PRO 14: International RILEM/CIB/ISO Symposium on Integrated Life Cycle Design of Materials and Structures (ILCDES 2000) by : Asko Sarja
Download or read book PRO 14: International RILEM/CIB/ISO Symposium on Integrated Life Cycle Design of Materials and Structures (ILCDES 2000) written by Asko Sarja and published by RILEM Publications. This book was released on 2000 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete International written by and published by . This book was released on 2000 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Final Report -- a Synthesis of the Use of Galvanized and Epoxy-coated Reinforcing Bar for Highway Bridges by : Kris Peterson
Download or read book Final Report -- a Synthesis of the Use of Galvanized and Epoxy-coated Reinforcing Bar for Highway Bridges written by Kris Peterson and published by . This book was released on 1996 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1990 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Epoxy-coated Reinforcement by : Jerzy Zemajtis
Download or read book Epoxy-coated Reinforcement written by Jerzy Zemajtis and published by . This book was released on 1996 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a historical performance review of epoxy-coated reinforcement. The information in this report is presented in chronological order starting from the early 1970's, when the first bridge with epoxy-coated reinforcement was built, and ending with the presentation at the 1993 TRB sessions, where findings from the latest research investigations were revealed. The report includes background information on fundamental applications of epoxy-coated reinforcing steel. Major laboratory studies, which addressed corrosion resistance and bond strength issues, are presented. Field investigations of meaningful structures with successful application of epoxy -coated reinforcing steel as well as structures with total failure of epoxy-coated reinforcement are also presented. The report also includes transcripted presentations, from the 1993 TRB sessions, which addressed quality control, adhesion characteristics, and other factors associated with long-term performance of epoxy-coated reinforcing steel. Conclusions from the laboratory and field investigations, as well as from the presentations of 1993 TRB sessions are presented.
Book Synopsis Summary Report on the Performance of Epoxy-coated Reinforcing Steel in Virginia by : Richard E. Weyers
Download or read book Summary Report on the Performance of Epoxy-coated Reinforcing Steel in Virginia written by Richard E. Weyers and published by . This book was released on 2006 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: From 1992 to 2006, the Virginia Transportation Research Council and its contract researchers conducted a long-term systematic series of investigations to evaluate the corrosion protection effectiveness of epoxy-coated reinforcement (ECR) and to identify and recommend the best and most cost-effective corrosion protection system for Virginia bridge decks. This report summarizes this research and subsequent efforts to implement alternative reinforcement. The work was conducted, and is reported, in this general order: review of historical performance of ECR, ECR performance in solutions and concrete, and preliminary field investigations; investigation of field performance of bridge decks built with ECR; assessment of alternative corrosion protection methods; development of probabilistic service life models for bridge decks and laboratory assessment of ECR cores extracted from bridge decks to determine service life extension; efforts to implement alternative reinforcement. The series of studies demonstrated that the epoxy coating on ECR naturally degrades in the highly alkaline moist environment within concrete. The subsequent loss of bond, coupled with the inevitable flaws in the coating induced by construction, leads to an estimated service life benefit of ECR of as little as 3 to 5 years. Further, non-critical decks, beams, and substructure elements not exposed to marine environments, particularly on secondary and rural routes, can be cost-effectively constructed and maintained using low-permeability concrete and black reinforcing bar. However, because the Federal Highway Administration requires the use of corrosion-resistant reinforcement, and because ECR cannot provide adequate corrosion protection for structures designed for a 100-year+ service life as currently recommended by FHWA, the report recommends that the Virginia Department of Transportation amend its specifications regarding the use of ECR to require the use of corrosion-resistant metallic reinforcing bars such as MMFX2, stainless steel clad, and solid stainless steel.
Book Synopsis Performance Evaluation of Corrosion Inhibitors and Galvanized Steel in Concrete Exposure Specimens by : Jerzy Zemajtis
Download or read book Performance Evaluation of Corrosion Inhibitors and Galvanized Steel in Concrete Exposure Specimens written by Jerzy Zemajtis and published by . This book was released on 1999 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion inhibitor admixtures (CIA) and galvanized reinforcing steel (GS) are used for the corrosion protection for reinforced concrete bridges. The results of a 3.5-year evaluation of exposure specimens containing CIA from three different manufacturers and GS are presented. The specimens were built to simulate four exposure conditions typical for concrete bridges located in the coastal region or inland where deicing salts are used. The exposure conditions were Horizontal, Vertical, Tidal, and Immersed Zones. The specimens were kept inside the laboratory and were exposed to weekly ponding cycles of 6% sodium chloride solution by weight. The methods used to assess the condition of the specimens included chloride concentration measurements, corrosion potentials, and corrosion rates. Additionally, visual observations were performed for identification of rust stains and cracking on concrete surfaces. The results of chloride testing indicate that the amount of chlorides present at the bar level is more than sufficient to initiate corrosion. Chloride and rapid permeability data indicate no significant difference either in a rate of chloride ingress or in the diffusion coefficients for concretes with and without CIA. Corrosion potentials were the most negative for the Bare Steel (BS) specimen prepared with the Armatec 2000 corrosion inhibitor and generally indicated a 90% probability of active corrosion. Corrosion potentials were similar for the two BS control specimens and the BS specimen prepared with Rheocrete 222 and generally indicated an uncertain probability of corrosion. Corrosion potentials were the least negative for the BS specimen prepared with DCI-S corrosion inhibitor and generally indicated a 90% probability of no corrosion. Rate of corrosion measurements were the highest for the BS control specimens and the one prepared with A2000 and the most recent data suggest corrosion damage in 2 to 10 years. Although early rate of corrosion measurements were higher or about the same as for BS control specimens, recent measurements were slightly lower for the specimen prepared with Rheocrete 222 and suggest corrosion damage in 10 to 15 years. Rate of corrosion measurements were consistently the lowest for the BS specimens prepared with DCI-S and indicate corrosion damage is expected in 10 to 15 years. The corrosion potential and rate of corrosion data indicate that DCI-S is the only CIA evaluated that clearly provides some level of corrosion protection. A direct comparison of the GS specimens to the BS specimens is not possible because the measured potential refers to the zinc oxide and not to the steel. Nevertheless, the potential data agree with the chloride and permeability data, as well as with the visual observations, and indicate the damaging effect of a high concentration of chloride ions on the GS. At low and moderate chloride exposures, however, GS does provide corrosion protection. Recommendations are to continue monitoring until sufficient cracking has occurred in all specimens to provide for making a better estimate of the service lives of CIA and GS used in the construction of concrete bridge components in Virginia. The specimens with CIA and one control (continuous reinforcement in the legs) should be taken to the Hampton Road North Tunnel Island and placed in the brackish water to a depth of the Immersed Zone at low tide for further exposure to chloride. The specimens with GS and the other control (non-continuous reinforcement in the legs) should remain in an outdoor exposure in Southwest Virginia like the Civil Engineering Materials Research Laboratory in Blacksburg, Virginia.
Book Synopsis Corrosion Protection Performance Evaluation of Low Permeable Concretes in Exposure Specimens by : Jerzy Zemajtis
Download or read book Corrosion Protection Performance Evaluation of Low Permeable Concretes in Exposure Specimens written by Jerzy Zemajtis and published by . This book was released on 1999 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of a mineral admixture or a combination of a mineral admixture with corrosion inhibitor are the methods used for the corrosion protection for reinforced concrete bridges. The results of a 1.5-year study on evaluation of three concretes with fly ash, slag cement (SC), and silica fume (SF) and one concrete with silica fume and a corrosion inhibitor (SFD) are presented. The specimens were built to simulate four exposure conditions typical for concrete bridges located in the coastal region or inland where deicing salts are used. The exposure conditions were horizontal, vertical, tidal, and immersed zones. The specimens were kept inside the laboratory and were exposed to weekly ponding cycles of 6% sodium chloride solution by weight. In addition, cover depth measurements from 21 bridge decks and chloride data from 3 bridge decks were used, together with laboratory data, in modeling the service lives of investigated corrosion protection methods. The methods used to assess the condition of the specimens included chloride concentration measurements, corrosion potentials, and corrosion rates (3LP). Additionally, visual observations were performed for identification of rust stains and cracking on concrete surfaces. The results of chloride testing indicate that the amount of chlorides present at the bar level is more than sufficient to initiate corrosion. Chloride and rapid permeability data demonstrate that for low permeable (LP) concretes there appears to be significant difference both in a rate of chloride ingress and in the diffusion coefficients in comparison to the controls. Corrosion potentials agree with corrosion rates and suggest the possibility of an active corrosion process development on control specimens during indoor exposure. The structural cracks that were observed in some specimens appeared to have no influence on the corrosion development on the bars in the vicinity of the these cracks. It was concluded that the silicone and duct tape protection was adequate. The cracking, other than structural, appeared to be related to the reinforcing steel corrosion, except the cracks in the horizontal zone of the specimen with slag cement which were probably caused by the subsidence cracking. The least number of cracks was observed on the SF and SFD specimens. Modeling the time as a function of probability of the end of functional service life (EFSL) was presented. It has been shown that the distributions of surface concentrations of chloride ions (CO) and diffusion constants (DC) are key elements in the model. Model predictions show that the LP concretes provide much better level of protection against moisture and chlorides than the A4 concrete alone. Application of a corrosion inhibitor causes an elevation of the chloride threshold resulting in an additional increase in time to EFSL. Recommendations are to continue monitoring until cracking has occurred in all specimens to a greater extent to better estimate the service lives of LP concretes than is presently known in the construction of concrete bridge components in Virginia. The specimens with LP concretes and one control (continuous reinforcement in the legs) should be taken to the Hampton Road North Tunnel Island and placed in the brackish water to a depth of the immersed zone at low tide for further exposure to chloride. The other control (non-continuous reinforcement in the legs) should remain in an outdoor exposure in Southwest Virginia like the Civil Engineering Materials Research Laboratory in Blacksburg, Virginia. Also more field studies are needed to better estimate distributions of surface chloride concentration and diffusion coefficient of Virginia bridge decks, and to confirm predicted times to EFSL for LP concretes.
Book Synopsis Evaluation of epoxy coated reinforcing steel by :
Download or read book Evaluation of epoxy coated reinforcing steel written by and published by . This book was released on 1977 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epoxy coated deck reinforcement was evaluated during the construction of two bridges on Rte. I-77 in Carroll County. The contractor was favorably impressed with the coated steel, which sustained no damage during shipping or deck construction. Among the data collected were resistivity and potential readings, initial chloride contents of the deck concrete, and unit costs. It appears that the epoxy coatings had many small bare spots and other flaws that were not effectively patched at the site. Further evaluations after the bridges are opened to traffic and subjected to applications of deicing salts are recommended.
Book Synopsis Research Results Digest - National Cooperative Highway Research Program by : National Cooperative Highway Research Program
Download or read book Research Results Digest - National Cooperative Highway Research Program written by National Cooperative Highway Research Program and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: