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Utility of High Alkalinity Cements for Control of Reinforcing Steel Corrosion in Concrete.
| 题名： | Utility of High Alkalinity Cements for Control of Reinforcing Steel Corrosion in Concrete. |
| 作者： | hartt, w. h. suarez, j. a. lankard, d. r. |
| 关键词： | alkali silica reaction, aggregates, chlorides, stainless steels, deterioration, florida |
| 摘要： | Corrosion induced deterioration of reinforced concrete bridge substructures in Florida coastal waters has been recognized for decades as a conditioning maintenance problem. Such distress arises as a consequence of (1) progressive chloride intrusion into the concrete over time, (2) localized breakdown of the otherwise protective passive film upon embedded reinforcing steel once chlorides achieve a critical concentration at the steel depth, (3) corrosion of the steel at a rate controlled by oxygen and moisture availability, and (4) cracking and spalling of the concrete cover from tensile hoop stresses generated in the concrete abut the reinforcement by expansive corrosion products. Unaddressed, these processes can lead to structural failure if either the reinforcement or concrete cross section (or both) become sufficiently reduced. The objective of the project was to investigate a previously unaddressed option for mitigating corrosion induced bridge substructure deterioration and thereby extend service life of new structures through improved concrete mix design and materials selection. / NOTE: Final rept. / Supplementary Notes: Prepared in cooperation with Lankard Materials Lab., Inc., Columbus, OH. Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0716；188p |
| 报告类型： | 科技报告 |
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