The physical testing of rock for road building : including the methods used and the results obtained . PHYSICAL TESTING OF ROCK FOE ROAD BUILDING. u. Fig. 4.—Details of Page impact testing machine. 12 PHYSICAL TESTING OF ROCK FOE ROAD BUILDING. The test consists of a 1-centimeter fall of the hammer for the firstblow, and an increased fall of 1 centimeter for each succeeding blow,until failure of the test piece occurs. The number of blows requiredto cause failure is used to represent the toughness. The impact test was adopted by the American Society for TestingMaterials on August 15, 1908. CORE
The physical testing of rock for road building : including the methods used and the results obtained . PHYSICAL TESTING OF ROCK FOE ROAD BUILDING. u. Fig. 4.—Details of Page impact testing machine. 12 PHYSICAL TESTING OF ROCK FOE ROAD BUILDING. The test consists of a 1-centimeter fall of the hammer for the firstblow, and an increased fall of 1 centimeter for each succeeding blow,until failure of the test piece occurs. The number of blows requiredto cause failure is used to represent the toughness. The impact test was adopted by the American Society for TestingMaterials on August 15, 1908. CORE DRILL. (For preparing rock core.)Specimens for the hardness and toughness test are prepared bydrilling a core from the sample of each to be tested. The core drill shown in figure 6consists of a steelcore tube A, carryingat its lower end thebrass ring B, con-taining eight carbonpoints, spaced asshown, to cut a rockcore 25 millimetersin diameter. Thecore tube is con-nected at the upperend with the brasscasing DE throughwhich passes thelower part of theshank C. The water-supplytube F is connecteddirectly to the sta-tionary brass ring G,which h
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Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1910, bookyear1912
