File:The physical testing of rock for road building - including the methods used and the results obtained (1912) (14782818762).jpg

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Identifier: physicaltestingo44gold (find matches)
Title: The physical testing of rock for road building : including the methods used and the results obtained
Year: 1912 (1910s)
Authors: Goldbeck, Albert Theodore, 1885- Jackson, Frank H. (Frank Herbert), 1882- United States. Bureau of Public Roads
Subjects: Aggregates (Building materials) Testing Rocks Testing
Publisher: Washington : U.S. Dept. of Agriculture, Office of Public Roads : G.P.O.
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Fig. 13—Ball mill, Office of Public Roads. kilogram of the rock to be tested is broken sufficiently small to passa half-inch mesh screen. This material is placed in a ball mill withabout 90 cc. of water sufficient to make a stiff paste after grinding.The mill, shown in figures 13 and 14, consists of a cast-iron casingA-B split into two unequal segments A and B. It revolves in a ver-tical plane about the shaft CC, which bears in the pillow blocks DDand is driven from the pulley E. The material is ground by the actionof two cast-steel shot, 2\ inches in diameter and weighing about 20pounds. Grinding is continued for 2\ hours at the rate of 2,000 revo-lutions per hour, after which the dough is removed and moldedinto cylindrical briquettes 25 mm. in diameter and 25 mm. high in aspecial briquette-forming machine, shown in figures 15, 16, and 17. 20 PHYSICAL TESTING OF ROCK FOE ROAD BUILDING.
Text Appearing After Image:
PHYSICAL TESTING OP ROCK POR ROAD BUILDING. 21 BRIQUETTE MACHINE. (For molding rock-dust specimens.) The hydraulic cylinder A supports an iron platform B throughthe piston rod C. The cylindrical metal die D provided with a closelyfitting plug E supported by guide rods KK and containing the mate-rial to be compressed is placed upon the platform and water admittedto the C)dinder through the supply pipe I. As the piston rises, theplatform and die are carried up with it, and the plug of the lattercomes in contact with a properly weighted lever arm G. The weightH is adjusted on the lever arm so as to give a maximum pressure of132 kilos per square centimeter on the compressed material, but this

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Goldbeck, Albert Theodore, 1885-; Jackson, Frank H. (Frank Herbert), 1882-;

United States. Bureau of Public Roads
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30 July 2014
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