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Title:

WATER CONTENT OF FRESH CONCRETE MEASURED BY NEUTRON RADIATION

Accession Number:

00214204

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309020840

Abstract:

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

Supplemental Notes:

Sponsored by Committee on Nuclear 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 #:

01410329

Authors:

Lepper Jr, Henry A
Rodgers, R B
Chamberlain, D E

Pagination:

pp 25-34

Publication Date:

1972

Serial:

Highway Research Record

Issue Number: 412
Publisher: Highway Research Board

Conference:

51st Annual Meeting of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1972-1-17 to 1972-1-21

ISBN:

0309020840

Media Type:

Digital/other

Features:

Figures (8) ; References (11)

Old TRIS Terms:

Subject Areas:

Highways; Materials

Files:

TRIS, TRB

Created Date:

Apr 17 1973 12:00AM

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