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Demonstration of Cost-Effective VARTM Technology for Repair and Strengthening - A Case Study with I-565 Highway Bridge. Final rept.
| 题名： | Demonstration of Cost-Effective VARTM Technology for Repair and Strengthening - A Case Study with I-565 Highway Bridge. Final rept. |
| 作者： | uddin, n. shohel, m. vaidya, u. serrano-perez, j. c. |
| 关键词： | *Bridge-structures; *VARTM-; *Repair-methods; *Case-study; *I-565-Highway-Bridge-(Alabama.;Laboratory-studies; T-bulb-girder. |
| 摘要： | High quality and expedient processing repair methods are necessary to enhance the service life of bridge structures. Deterioration of concrete can occur as a result of structural cracks, corrosion of reinforcement, and freeze-thaw cycles. Most infrastructure-related applications of fiber-reinforced plastics use traditional hand lay-up technology. This process is tedious, expensive, labor-intensive, and sensitive to personnel skill level. An alternative to hand lay-up is Vacuum Assisted Resin Transfer Molding (VARTM). This newly introduced technique for civil infrastructure, VARTM, uses single sided molding technology to infuse resin over fabrics while wrapping large structures such as bridge girder spans, wall panels, and columns. There is limited understanding of the problems or the benefits developed when VARTM processing is adapted to wrap fibers such as carbon and/or glass over concrete structures. A weak laminate-concrete interface creates potential problems such as water seepage, fiber wrinkling, premature failure caused by debonding at the interface, and moisture-induced delamination. This project was conducted to improve understanding in the composite-concrete interface, the feasibility of VARTM over a large reinforced concrete structure, and the issues encountered in the practical implementation of the processing route. The laboratory studies performed during this project made possible the implementation of this technology in a full size T-bulb girder of I-565 in Huntsville, Alabama, which is the first of its kind (the researchers knowledge) to have been retrofitted using VARTM. Unidirectional carbon fiber Sikawrap HEX 103C and low viscosity epoxy resin Sikadur 300 were used in the processing of the concrete specimens. |
| 报告类型： | 科技报告 |
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