Bulletin - United States, Office of Public Roads, Թողարկում 33-48U.S. Government Printing Office, 1908 |
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Agriculture amount andesite applied Approxi asphaltic Average cost barium chromate binding bitumen bituminous-macadam roads bridge carbon cementing value cent improved chemical clay coal coal tar coating concrete corrosion cost per mile counties report crude cubic centimeter culverts determined Diabase diameter diorite distillation Dollars Dolomite dust prevention earth roads emulsions feet feldspar gabbro grams granite gravel roads hard heated highway hornblende hydrometer igneous rocks improved roads inches iron Limestone macadam macadam roads mate percentage metal method Mileage of improved mileage of public obtained Office of Public paraffin percentage of roads pigments PLATE present public roads quarry quartzite residue rhyolite road building road materials available road surface roads improved sample sand sand-clay roads sandstone schists Section silicate solution specific gravity square yard steel stone Table tars temperature tion total mileage toughness town township traffic U. S. Dept Washington wear weight zinc
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Էջ 17 - The crucible and both flasks are then dried at 125° C. and weighed. The filtrate containing the bitumen is evaporated, the bituminous residue burned, and the weight of the ash thus obtained added to that of the residue in the two flasks and the crucible. The sum of these weights deducted from the weight of substance taken gives the weight of bitumen extracted.
Էջ 119 - And whenever the commission shall be of opinion, after a hearing, had upon its own motion or upon complaint...
Էջ 15 - The most widely used method of making the total bitumen determination consists in dissolving the bitumen in carbon disulphide and recovering any insoluble matter by filtering the solution through an asbestos felt. The form of Gooch crucible best adapted for the determination is 4.4 centimeters wide at the top, tapering to 3.6 centimeters at the bottom, and is 2.5 centimeters deep.
Էջ 18 - ... flask. If difficulty is still experienced in dissolving the material, a rounded glass rod will be found convenient for breaking up the undissolved particles. Not more than one-half of the total amount of naphtha required should be used until the sample is entirely broken up. The balance of the 100...
Էջ 1 - The stopper is then inserted in the tube and the cup filled with water at 25 °C. to the top of the projections. The measuring cylinder should be placed directly under the outflow tube so that the material, upon flowing out, will not touch the sides, and the stopper may then be removed. The time required...
Էջ 25 - The residue is poured into an 11-cm. porcelain evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation is carried on at a gentle heat, with continual stirring, until foaming practically ceases. It is advisable to have a large watch glass at hand to smother the flames quickly should the material ignite. As the foaming subsides, the heat of the steam bath may be gradually raised, and evaporation...
Էջ 16 - The crucible is filled with the suspended asbestos, which is allowed to settle for a few moments. A light suction is then applied to draw off all the water and leave a firm mat of asbestos in the crucible. More of the suspended material is added, and the operation is repeated until the felt is...
Էջ 3 - ... to any desired temperature at which the test is to be made. This temperature should be accurately maintained, and should at no time throughout the entire test be allowed to vary more than one-half a degree Centigrade from the temperature selected.