File:The physical testing of rock for road building - including the methods used and the results obtained (1912) (14783164525).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. 8.—Details of diamond saw. PHYSICAL TESTING OF ROCK FOR ROAD BUILDING 15 circumference of which diamond dust is held in radial slots. Thissaw is driven by a small electric motor at a speed of 600 revolutionsper minute. 1 MCTXi. r</B£-.
Text Appearing After Image:
Fig. 9.—Details of grinding lap.GRINDING LAP. In the preparation of the faces of hardness and toughness specimens, agrinding lap, 9 inches in diameter, driven at 400 revolutions per minute,is used. The abrasive agent is finely powdered emory. (See fig. 9.) 16 PHYSICAL TESTING OF KOCK FOE ROAD BUILDING. ABRASION TEST. The abrasion test, as performed in the Deval abrasion machine,tests the hardness as well as the toughness of rock, and much valu-able information has been obtained on the wearing qualities of rocksince this test was originated in the French School of Bridgesand Roads. ABRASION MACHINE (DEVAL TYPE). The Deval machine (see fig. 11) consists essentially of the pulley A(or worm gear and motor, direct connected, as used at present) drivingthe shaft BB, upon which are mounted the four cast-iron cylinders CCCCin such a way that the axes of the cylinders are inclined at an angleof 30° with the axis of rotation. These cylinders are 20 centimetersin diameter and 34 centimeters i

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

United States. Bureau of Public Roads
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