No coin nor oath required. For personal study only.
In a paper by J. W. McBurney and C. E. Lovewell, entitled "Strength, Water Absorption and Resistance to Weathering of Building Brick Produced in the United States," presented at the June I933 meeting of the American Society for Testing Materials, there is given a rather complete picture of the quality oLthe brick produced in the United States. Two hundred and fifty-five manufacturers representing 37.4 per cent. of the I929 brick production submitted a total of 684 samples covering all grades produced. The paper gives weighted averages of several physical properties for both the "hard" and "salmon" brick manufactured in different districts of the United States. The range of strength and water absorption of the brick is given not only for the whole United States but also individually for the principal cities. The grand weighted average for compressive strength of all samples included in the survey is 7,246 lbs./in3 with a range for individual samples of from less than 1,5oo to over 2I,OOO lbs./in3 Water absorption, measured by 5 hour boiling, ranges from less than 2 per cent. up to 34 per cent. with a weighted average for all bricks of I4 per cent.
The paper discusses the question of distinguishing "hard" from "salmon" bricks on the basis of strength and water absorption. The data include the results of 5I cycles of freezing and thawing on approximately 48o specimens, for the most part classified as "salmon," as well as the manufacturers' classification of all samples. It is concluded that no sharp separation of these two grades of brick can be made, but that rejection of salmon grades can be insured by specifying combination of strength or water absorption with values for the ratio of 48 hour cold water absorption to 5 hour boiling water absorption.
DETERMINATION OF SODA IN GLASSES CONTAINING
A modification of the determination of soda by precipitation as sodium zinc uranyl acetate was reported by Glaze in the Journal of the American Ceramic Society, Volume I4, No.
๐ SIMILAR VOLUMES
Grab a hard hat and all your tools, and get ready for a construction adventure in counting! This clever, rhyming picture book leads readers through a day in the life of a construction crew building with bricks. A brick may seem like just a simple block, but in groupings of ten, twenty, and more, it