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Title:

MEASUREMENT OF CEMENT CONTENT BY USING NUCLEAR BACKSCATTER-AND-ABSORPTION GAUGE

Accession Number:

00300420

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

The delays inherent in current methods for the quality control of portland cement concrete allow large volumes to be placed before problems are discovered. This paper discusses an instrument and a test method for obtaining early quality information: The device is a nuclear backscatter-and-absorption gauge that measures the cement content of plastic concrete. The paper includes a description of the device, a summary of two laboratory evaluation studies, and a discussion of the data obtained by using the gauge on five highway construction projects. Laboratory evaluations established the accuracy of the gauge, its field worthiness and dependence on aggregate composition, and its lack of dependence on concrete density, temperature, and other batching variables. The results showed accuracies of plus or minus 13 kg/cu m (plus or minus 22 lb/cu yd) for most siliceous aggregate mixes and plus or minus 18 kg/cu m (plus or minus 31 lb/cu yd) for calcareous aggregate mixes. In most cases, nuclear-gauge determinations on the field sites agreed with calculated cement factors established from batch tickets. Discrepancies encountered on two of the field projects are discussed. The major limitations of the gauge are the necessity for recalibration whenever the aggregate source or the ratio of coarse to fine aggregates is changed and its reduced accuracy for calcareous and certain siliceous aggregates. /Author/

Supplemental Notes:

Publication of this paper sponsored by Committee on Curing of Concrete. 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 #:

01411528

Authors:

Mitchell, Terry M

Pagination:

pp 34-40

Publication Date:

1978

Serial:

Transportation Research Record

Issue Number: 692
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

57th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1978-1-16 to 1978-1-20

ISBN:

0309028388

Media Type:

Digital/other

Features:

Figures (8) ; Photos; References (8)

Subject Areas:

Geotechnology; Highways; Materials

Files:

TRIS, TRB

Created Date:

Sep 29 1979 12:00AM

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