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In situ determination of the chloride content of portland cement concrete in bridge decks : feasibility study : interim report : [prepared for Federal Highway Administration, Offices of Research and Development]

Author: J R Rhodes; United States. Federal Highway Administration. Offices of Research and Development.
Publisher: Washington : Dept. of Transportation, Federal Highway Administration, Offices of Research and Development ; Springfield, Va. : Available through the National Technical Information Service, 1977.
Series: Report - Federal Highway Administration ; no. FHWA-RD-77-26
Edition/Format:   Print book : EnglishView all editions and formats
Database:WorldCat
Summary:
The objective of this two-phase program is to develop a gauge and corresponding test method for rapid, local, in situ determinations of the total chloride ion concentration in P.C.C. bridge decks or other reinforced concrete members at the level of the outermost mat of reinforcing steel, with a sensitivity of 100 ppm Cl or better. In Phase I a literature search and paper study confirmed that X-ray fluorescence,  Read more...
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Document Type: Book
All Authors / Contributors: J R Rhodes; United States. Federal Highway Administration. Offices of Research and Development.
OCLC Number: 3365861
Notes: "FHWA-RD-77-26."
Contract no. DOT-FH-11-8901.
Description: vi, 108 pages : illustrations ; 27 cm
Contents: Introduction --
Paper study --
Sample preparation --
X-ray fluorescence methods --
Neutron-gamma techniques --
Conclusions and recommendations --
Bibliography.
Series Title: Report - Federal Highway Administration ; no. FHWA-RD-77-26
Responsibility: J.R. Rhodes [and others].

Abstract:

The objective of this two-phase program is to develop a gauge and corresponding test method for rapid, local, in situ determinations of the total chloride ion concentration in P.C.C. bridge decks or other reinforced concrete members at the level of the outermost mat of reinforcing steel, with a sensitivity of 100 ppm Cl or better. In Phase I a literature search and paper study confirmed that X-ray fluorescence, thermal neutron activation and thermal neutron-prompt gamma analysis were the only promising techniques. A dual measurement method, employing both the prompt gamma and activation techniques, was shown to be feasible for nondestructive monitoring of chloride content at a specified depth or depth region below the surface with a sensitivity of 100 ppm or better, independently of the chloride content in the surface layers. The instrumentation could be used for rapid in-situ sample analysis.

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