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CONDITION EVALUATION OF CONCRETE BRIDGES RELATIVE TO REINFORCEMENT CORROSION. VOLUME 7: METHOD FOR FIELD MEASUREMENT OF CONCRETE PERMEABILITY.
| 题名： | CONDITION EVALUATION OF CONCRETE BRIDGES RELATIVE TO REINFORCEMENT CORROSION. VOLUME 7: METHOD FOR FIELD MEASUREMENT OF CONCRETE PERMEABILITY. |
| 作者： | Whiting-D; Cady-PD |
| 关键词： | REINFORCED-CONCRETE-BRIDGES; STEEL-REINFORCEMENT; CORROSION-; CONDITION-MONITORING; CONCRETES-; MEASURING-; PERMEABILITY-; MEASURING-DEVICES; STRATEGIC-HIGHWAY-RESEARCH-PROGRAM |
| 摘要： | A prototype surface air flow device for the estimation of concrete surface permeability has been developed. The method measures the rate of air flow through a vacuum plate placed on a concrete surface under a vacuum of approximately 25 in. of mercury. The effective depth of measurement is approximately 0.5 in. below the surface. The method was calibrated and the results were found to correlate well with chloride diffusion constants derived from 90-day ponding tests, as well as with the true air permeabilities measured using a pulse decay technique. A field prototype based on the SAF method was also developed. The portable field device operates off rechargeable nickel-cadmium batteries. Readings can be obtained at the rate of approximately one per minute, allowing a large amount of information to be developed at close intervals across a given concrete member. |
| 总页数： | 1992/09. pp87 (Figs., Tabs., 29 Ref., 2 App.) |
| 报告类型： | 科技报告 |
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