Specifications for Bituminous Paving Adopted October 14 1915
Specifications for Bituminous Paving Adopted October 14 1915
American Society of Municipal Engineers
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It shall be free from water as determined by distillation and shall show upon ignition not more than l / 2 per cent of inorganic matter. No distillate shall be obtained lower than 338 degrees F. , and up to 600 degrees not less than 5 per cent and not more than 20 per cent of distillate shall be obtained. The distillate shall be of a gravity of not less than 1. 03 at 60 degrees F. The residue shall have a melting point of not more than 165 degrees F. In making this distillation an 8-ounce glass... retort shall be used and the ther- mometer suspended so that before applying the heat the bulb of the thermometer is one-half inch above the surface of the liquid. The melting point of the pitch shall be determined by suspending a l / 2 -inch cube in a beaker of water one inch above the bottom. The temperature shall be raised 9 degrees per minute from 60 degrees F. The temperature recorded the instant the pitch touches the bottom shall be considered the melting point of the pitch. In testing the original materials the initial temperature shall be 40 degrees F.
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