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 . D Fig. 21.—New York Testing Laboratory float apparatus. water maintained at 5° C, and left in this bath for at least 15 minutes. Meanwhilethe other cup is filled about three-fourths full of water and placed on the tripod, andthe water is heated to any desired temperature at which the test is to be made. Thistemperature should be accurately maintained, and should at no time throughout theentire test b
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 . D Fig. 21.—New York Testing Laboratory float apparatus. water maintained at 5° C, and left in this bath for at least 15 minutes. Meanwhilethe other cup is filled about three-fourths full of water and placed on the tripod, andthe water is heated to any desired temperature at which the test is to be made. Thistemperature should be accurately maintained, and should at no time throughout theentire test be allowed to vary more than one-half a degree centigrade from the temper-ature selected. After the material to be tested has been kept in the ice water for atleast 15 minutes, the collar with its contents is removed from the plate and screwedinto the aluminum float, which is then immediately floated in the warmed bath. Asthe plug of bituminous material becomes warm and fluid, it is gradually forced up-ward and out of the collar, until water gains entrance to the saucer and causes it tosink. The time in seconds between placing the apparatus on the water and when thewater breaks through t
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectroadmat, bookyear1921
