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Long-Term Post-Tensioned Beam Exposure Test Specimens: Final Evaluation.
| 题名： | Long-Term Post-Tensioned Beam Exposure Test Specimens: Final Evaluation. |
| 作者： | salas, r. m. kotys, a. l. west, j. s. schokker, a. j. breen, j. e. |
| 关键词： | *Beams-Supports; *Corrosion-protection; *Durability-.;Post-tensiong; Concrete-structures; Tendons-; Grout-; Ducts-; Columns-Supports; Structural-design; Construction-; Exposure-; Chlorides-; Cyclic-loads; Cracking-Fracturing; Performance-evaluation. |
| 摘要： | In the last few years, the effectiveness of cement grout in galvanized or polyethylene ducts, the most widely used corrosion protection system for multistrand bonded post-tensioned concrete tendons, has been under debate, due to significant tendon corrosion damage, several reported failures of individual tendons as well as a few collapses of non-typical structures. While experience in the USA has been generally good, some foreign experience has been less than satisfactory. This report is part of a comprehensive research program started in 1993, which has the objectives to examine the use of post-tensioning in bridge substructures, identify durability concerns and existing technology, develop and carry out an experimental testing program, and conclude with durability design guidelines. Three experimental programs were developed: A long term macrocell corrosion test series, to investigate corrosion protection for internal tendons in precast segmental construction; a long term beam corrosion test series, to examine the effects of post-tensioning on corrosion protection as affected by crack width; and, a long term column corrosion test series, to examine corrosion protection in vertical elements. |
| 报告类型： | 科技报告 |
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