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Title:

NONDESTRUCTIVE MONITORING OF CHLORIDE IN BRIDGE DECKS WITH A MOBILE NEUTRON-GAMMA SPECTROMETER

Accession Number:

00348710

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309032638

Abstract:

A mobile, self-contained instrument for rapid, nondestructive monitoring of chloride content at the reinforcing-bar level in portland cement concrete bridge decks has been developed to field prototype stage and tested on a range of concrete specimens and on five bridge decks in Texas. The instrument uses the technique of neutron-induced gamma-ray spectrometry with a 400-mug californium-252 sealed neutron source. Two measuring heads provide the capability for depth discrimination and enable chloride contents to be measured at the reinforcing-bar depth irrespective of surface washout, salt encrustation, the presence of overlays or membranes, and different depth distributions of chloride content. The sensitivity to chloride obtained depends on the required depth discrimination and speed of measurement but is normally sufficient to detect chloride concentrations below the corrosion threshold of approximately 300 mg/kg (1.2 lb/cube yds). (Author)

Supplemental Notes:

Publication of this paper sponsored by Committee on Instrumentation Principles and Applications. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

01411629

Authors:

Rhodes, J R

Pagination:

pp 88-94

Publication Date:

1981

Serial:

Transportation Research Record

Issue Number: 821
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

60th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1981-1-12 to 1981-1-16

ISBN:

0309032638

Media Type:

Print

Features:

Figures (1) ; Photos (6) ; References (6) ; Tables (5)

Uncontrolled Terms:

Mobile equipment

Subject Areas:

Bridges and other structures; Geotechnology; Highways; Materials; I35: Miscellaneous Materials

Files:

TRIS, TRB

Created Date:

Jun 30 1982 12:00AM

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