Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . e maintained as nearlyas practicable at 21° C. (70° F.). The cement shall be considered to have acquiredits initial set when the pat will bear, without appreciable indentation, the Gillmoreneedle one-twelfth inch in diameter, loaded to weigh one-fourth pound. The final 26 BULLETIN 949, U. S. DEPARTMENT OV ACEIOULTTTRE. set has been acquired when the pat will bear without appreciable indentation, theG
Standard and tentative methods of sampling and testing highway materials : recommended by the Second Conference of State Highway Testing Engineers and Chemists, Washington, , Feb 23-27, 1920 . e maintained as nearlyas practicable at 21° C. (70° F.). The cement shall be considered to have acquiredits initial set when the pat will bear, without appreciable indentation, the Gillmoreneedle one-twelfth inch in diameter, loaded to weigh one-fourth pound. The final 26 BULLETIN 949, U. S. DEPARTMENT OV ACEIOULTTTRE. set has been acquired when the pat will bear without appreciable indentation, theGillmore needle one twenty-fourth inch in diameter, loaded to weigh 1 pound. Inmaking the test, the needles shall be held in a vertical position, and applied lightlyto the surface of the pat. , TENSION TESTS. (51) The form of test piece shown in figure 13 shall be used. The molds shall bemade of noncorroding metal and have sufficient material in the sides to preventspreading during molding. Gang molds when used shall be of the type shown infigure 14. Molds shall be wiped with an oily cloth before using. (a) Pot with top surface flattened for determining time of setting by Gillmore
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