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Title:

RAPID, ACCURATE METHOD FOR THE DETERMINATION OF SULFUR TRIOXIDE IN HYDRAULIC CEMENT

Accession Number:

00616329

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309051053

Abstract:

A method for determining sulfur trioxide (SO3) content of hydraulic cement is described. The method depends on heating the sample with the least possible amount of nitric acid. After filtration, the filtrate is diluted to a given volume and an aliquot passed through a cation exchange resin (hydrogen form) to separate all cations present. The eluant is diluted to volume, and an aliquot titrated against standard barium perchlorate solution using dimethylsulfonazo III (DMSA III) as visual indicator. Acetone helps detection of the equivalence point that is characterized by a color change from purple to sky blue. Seven Standard Reference Material portland cements and three commercially available cements were analyzed. Each cement sample was analyzed six times. The average absolute error for 60 determinations amounted to plus or minus 0.041%, and the pooled standard deviation for the 10 samples is 0.031%, for 50 degrees of freedom. All of the samples analyzed passed the t test at the 99% level. One sample determination consumes about 2 hr. The method requires no equipment other than a pH meter and ordinary glassware.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1301, Factors Affecting Properties and Performance of Pavements and Bridges 1991. 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 #:

01407099

Authors:

Bishara, S W

Pagination:

p. 127-132

Publication Date:

1991

Serial:

Transportation Research Record

Issue Number: 1301
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309051053

Features:

References (26) ; Tables (2)

Uncontrolled Terms:

Rapid methods

Old TRIS Terms:

Subject Areas:

Highways; Materials; I32: Concrete

Files:

TRIS, TRB, ATRI

Created Date:

Oct 31 1991 12:00AM

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