%MurNBconcretesecond070051; ]> Memorandum from R. L. Murray to Dr. Clifford K. Beck [a machine-readable transcription] Murray, Raymond L. Creation of machine-readable version: Russell S. Koonts Creation of digital images: Russell S. Koonts Conversion to TEI.2-conformant markup: NCSU Science and Technology Electronic Text Center. ca. 9 kilobytes NCSU Libraries. Raleigh, NC. Modern English, MurNBconcretesecond070051

Available from: NC State University Archives

Publicly-accessible

URL: http://www.lib.ncsu.edu/archives/etext/engineering/reactor/murray/

 2000

Nuclear Reactor Digitization Project

Raymond L. Murray Reactor Project Notebook

 Illustrations have been included from the print version. Scanned by Russell Koonts with Photoshop 5.0 software. Memorandum from R. L. Murray to Dr. Clifford K. Beck <author>Raymond L. Murray</author> <respStmt> <resp/> <name/> </respStmt> </titleStmt> <editionStmt> <p></p> </editionStmt> <extent>2 pp.</extent> <publicationStmt> <publisher></publisher> <pubPlace></pubPlace> <date></date> <idno>Manuscript copy consulted: NCSU Libraries call number UA105.16</idno> </publicationStmt> <seriesStmt> <p/> </seriesStmt> <notesStmt> <note></note> </notesStmt> </biblFull> </sourceDesc> </fileDesc> <encodingDesc> <projectDesc> <p>Prepared for the NCSU Libraries Science and Technology Electronic Text Project.</p> </projectDesc> <editorialDecl> <p>Spell-check and verification made against printed text using Notetab spell checker.</p> <p>The lineation of the manuscript has been maintained and all end-of-line hyphens have been preserved.</p> <p>The images exist as archived TIFF images, one or more JPEG versions for general use, and thumbnails.</p> <p id="ETC">Keywords in the header are a local Electronic Text Center scheme to aid in establishing analytical groupings.</p> </editorialDecl> <refsDecl> <p>ID elements are given for each page element and are composed of the text's unique cryptogram and the given page number, as in NEprop033050a for the title page of Clifford Beck's Proposal.</p> </refsDecl> <classDecl> <taxonomy id="LCSH"> <bibl> <title>Library of Congress Subject Headings July, 1951 English non-fiction; prose LCSH 24-bit color; 400 dpi Memorandum from R. L. Murray to Dr. Clifford K. Beck Typescript 2 pp. July, 1951 MurNBconcretesecond070051

OFFICIAL USE ONLY TO: Dr. Clifford K. Beck FROM: R. L. Murray SUBJECT: Concrete Tests -- Second Series COPIES TO: Dr. R. E. Fadum, Mr. C. R. Bramer, and Members of the ReactorCommittee

The effect of special setting agents that would allow the reduction of the amount of water added was studied. The goal was to achieve a mix that was fluid enough to make pouring easy for a contractor, with sufficient speed of setting and final strength.

Test E. July 9, Poured 4:45 P.M. Composition (lb) 46.70 Georgia Barytes4.70 ColemaniteTemperature 83°F9.80 Type III CementHumidity 54%4.00 Water (10% over specifications)3 cc Darex AEA (Dewey and Almy Chemical Co., Cambridge, Mass.)
 All ingredients except Colemanite were thoroughly mixed. Five minutes later the Colemanite was blended in this test cylinder, and was well set by 24 hours.

Test F. July 9, Poured 5:40 P.M. This batch was the same as for test E, except that the water content was 4.40 lb. (12.1% over specifications). The procedure used was also the same. No significant difference in consistency at the end of 24 hours was evident. Initial set in 24 hours.

Test G. July 10, Poured 11:55 A.M. Composition (lb) 46.70 Georgia Barytes 4.70 Colemanite 9.80 Type III Cement 4.60 Water (12.6% over specifications) The ingredients, excluding Colemanite, were thoroughly mixed and allowed to set for an hour before Colemanite added. The mix was quite workable, with a 1/4" slump. Initial set in 24 hours.

Test H. July 10, Poured 11:45 A.M. Composition (lb) 46.70 Georgia Barytes 4.70 Colemanite 9.80 Type III Cement 4.00 Water (11% over specifications) 0.20 Puzzolith (Deflocculation agent, dissolved in water) The Colemanite was added five minutes after other ingredients were mixed. Mix workable even with low water content. Although slower to set than the others, it was hard in 48 hours.

Test J. July 10, Poured 4:30 P.M. Composition (lb) 46.70 Georgia Barytes 4.70 Colemanite 9.80 Type III Cement 4.20 Water 0.05 Puzzolith The above materials wore mixed and hold for 45 minutes. Vary fluid work- ing (0.30 lb of water were added shortly after the Colemanite was mixed in) consistency. Initial set in 24 hours.

Test K. July 10, Poured 5:00 P.M. Composition (lb) 46.70 Georgia Barytes 4.70 Colemanite 9.80 Type III Cement 4.20 Water 5 cc Darex AEA The above materials were mixed and held for 45 minutes as before, 0.30 lb of water added after Colemanite blended in. Not as workable as J. Initial set in 24 hours.

Test L. July 12, Poured 12:50 A.M. Mixed double batch in large mixer twice the following (lb) 46.70 Georgia Barytes 9.80 Type III Cement 4.40 Water After mixing the above, and allowing a setting time of 40 minutes, twice 4.70 lb of Colemanite were mixed in, then lubricated with twice 0.40 lb of water. The slump was 2 1/2". Two cylinders labeled as above were made.

Test N. July 12 Ordinary Concrete (lb) 30 Gravel 20 Sand 7 Cement 6 Water Cylinder made for neutron experiments. Data on strengths and density will be supplied in a later note.