Bulletin Volume 41-60 by Iowa Engineering Experiment Station
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Author: Iowa Engineering Experiment Station
Page Count: 260 pages
Published Date: 10 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: eBook
ISBN: 9781231215036
Download Link: Bulletin Volume 41-60
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 Excerpt: ...for making freezing and thawing tests existed when this investigation was made, it was considered necessary to try to find a satisfactory method by trial. The ' preliminary' tests now to be described were made by a method which did not prove satsifactory. Description of "Preliminary" Tests. The specimens used for this: test were those two A, B and C pieces, from each tile, which had the largest and smallest per cents, respectively, of absorption at the end of the 24 hour immersion period. These pieces were given the hot water treatment described on pages 37 and 38, and then were marked and packed in a wire basket which fitted loosely inside the copper can in the freezing box. Each piece was marked by fastening to it, with small copper wire, a copper tag stamped with the number of the tile and the letter designating the piece. The specimens were given two freezings and thawings per day during which they were subjected to temperatures of from 3F to 7F for at least five hours at each freezing period. At the end of the freezing period the basket of specimens was raised from the freezing box and lowered into the thawing tank for a one-hour thawing period. Following the thawing period the specimens were cooled and then returned to the freezing box. The temperature of the water in the thawing tank ranged from 140F to 200F, before the specimens were lowered into it. It was usually necessary to lessen the heat under the tank in order to prevnt the water from boiling before the end of the thawing period. The plan was to thaw the specimens in very hot water, but not in boiling water. FIG. 13. PLANS OF FREEZING BOX. DESIGNED AND USED BY THE IOWA ENGINEERING EXPERIMENT STATION AND ADOPTED AS STANDARD BY THE AMERICAN SOCIETY FOR TESTING MATERIALS. The freezing ...
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