JOM KITA KE POLITEKNIK

Zinc Oxide as a Standard Substance in the Solution Calorimetry of Portland Cement (Record no. 620)

MARC details
042 ## - AUTHENTICATION CODE
Authentication code dc
100 10 - MAIN ENTRY--PERSONAL NAME
Personal name Newman, Edwin S.
Relator term author
9 (RLIN) 404
245 00 - TITLE STATEMENT
Title Zinc Oxide as a Standard Substance in the Solution Calorimetry of Portland Cement
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Name of publisher, distributor, etc. National Institute of Standards and Technology,
Date of publication, distribution, etc. 1962.
500 ## - GENERAL NOTE
General note /pmc/articles/PMC6696539/
520 ## - SUMMARY, ETC.
Summary, etc. Zinc oxide is the standard substance specified for calibrating the heat-of-solution calorimeters used in determining the heat of hydration of portland cement in several American and foreign cement specifications. The heats of solution of zinc oxide samples from different sources and after different heat treatments have been determined in the standard mixture of nitric and hydrofluoric acids. It is concluded that the value given in the specifications is low, that heat treatment in the range 310 to 950 °C is not critical, that small variations in the ZnO/acid weight ratio are without significance, and that analytical-reagent zinc oxide from various sources may safely be used. The mean value obtained for the heats of solution of zinc oxide from twelve sources determined in triplicate in 1.00HNO(3),0.284HF,26.38H(2)O at a ZnO/acid weight ratio of 7/425 at 25 °C was 257.82 cal/g with a standard error of 0.015 cal/g. The thermochemical calorie of 4.1840 joules is used. The temperature coefficient based on least-square fitting to 16 data points obtained in an earlier study was −0.087 cal/g-deg, with a computed standard error of 0.013 cal/g-deg. The corresponding values for heat of solution and temperature coefficient given in the specifications are 256.6 cal/g and −0.1 cal/g-deg, respectively.
540 ## - TERMS GOVERNING USE AND REPRODUCTION NOTE
Terms governing use and reproduction
546 ## - LANGUAGE NOTE
Language note en
690 ## - LOCAL SUBJECT ADDED ENTRY--TOPICAL TERM (OCLC, RLIN)
Topical term or geographic name as entry element Physics and Chemistry
655 7# - INDEX TERM--GENRE/FORM
Genre/form data or focus term Text
Source of term local
786 0# - DATA SOURCE ENTRY
Note J Res Natl Bur Stand A Phys Chem
856 41 - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier <a href="http://dx.doi.org/10.6028/jres.066A.039">http://dx.doi.org/10.6028/jres.066A.039</a>
Public note Connect to this object online.

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