CONDITION EVALUATION OF CONCRETE BRIDGES RELATIVE TO REINFORCEMENT CORROSION. VOLUME 7: METHOD FOR FIELD MEASUREMENT OF CONCRETE PERMEABILITY
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.
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Supplemental Notes:
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Corporate Authors:
Strategic Highway Research Program
National Research Council, 2101 Constitution Avenue, NW
Washington, DC United States 20418 -
Authors:
- WHITING, D
- Cady, P D
- Publication Date: 1992-9
Language
- English
Media Info
- Features: Appendices; Figures; References; Tables;
- Pagination: 87 p.
Subject/Index Terms
- TRT Terms: Concrete; Corrosion; Material reinforcement; Measurement; Measuring instruments; Monitoring; Permeability; Reinforced concrete bridges
- Identifier Terms: Strategic Highway Research Program
- Uncontrolled Terms: Condition monitoring
- Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00624364
- Record Type: Publication
- Report/Paper Numbers: SHRP-S-329
- Files: TRIS, TRB, ATRI
- Created Date: Oct 20 1993 12:00AM