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Image from page 7 of “Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920” (1921)
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Identifier: standardtentativ949unit
Title: Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, D.C., Feb. 23-27, 1920
Year: 1921 (1920s)
Authors: United States. Bureau of Public Roads Second Conference of State Highway Testing Engineers and Chemists (1920 : Washington, D.C.)
Subjects: Road materials
Publisher: Washington, D.C. : U.S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library
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4 BULLETIN 949, IT. S. DEPARTMENT OF AGRICULTURE. the f-inch screen and retained on the £-inch screen. This material shall be placedin the cast-iron cylinder of the Deval machine as specified for the standard abrasiontest on stone. Six cast-iron spheres 1.875 inches in diameter and weighing approxi-mately 0.95 pound (0.45 kg.), each, shall be placed in the cylinder as an abrasivecharge. These spheres are the same as those used in the standard rattler test forpaving brick. (2) The duration of the test and the rate of rotation shall be the same as specifiedfor the standard test for stone, namely, 10,000 revolutions at a rate of 30 to 33 revolu-tions per minute. At the completion of the test the material shall be taken out andscreened over a -^inch mesh sieve. The material retained upon the sieve shall be
Text Appearing After Image:
Fig. 2.—Details of Dorry hardness machine. washed and dried and the percentage loss by abrasion of the material passing the ■£$-inch mesh sieve calculated. (3) When the material has a specific gravity below 2.20 a total weight of 4,000grams made up of the four groups of sizes described above, instead of 5,000 grams,shall be used in the abrasion test. 3. DORRY HARDNESS TEST FOR ROCK. (1) A core 25 mm. in diameter and about 10 cm. long shall be cut with the diamonddrill from the specimen to be examined. The core should in every case be drilledperpendicular to the bedding plane of the rock. After thoroughly drying, the speci-men shall be inserted in grip of the Dorry machine (fig. 2), leaving about 1 inch pro-jecting from the lower end. The grip shall then be inserted in the sleeve so that the SAMPLING AND TESTING HIGHWAY MATERIALS. 5 lower end of the specimen rests on the steel disk. The funnel shall be rilled withsand and the machine run until the lower end of the specimen has bee
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