Bulletin - United States, Office of Public Roads, Թողարկում 33-48U.S. Government Printing Office, 1908 |
From inside the book
Արդյունքներ 100–ի 1-ից 5-ը:
Էջ 30
... Macadam roads of this material in Augusta are well built and firm , but because of the low toughness of the granite , causing it to break up under traffic , they are quite dusty in dry weather . If they could be covered with a dressing ...
... Macadam roads of this material in Augusta are well built and firm , but because of the low toughness of the granite , causing it to break up under traffic , they are quite dusty in dry weather . If they could be covered with a dressing ...
Էջ 31
... road - bed . Similar gravel is found in the " Plains " southeast of the city . This gravel might be used to good advantage as a binder and top dressing for macadam roads built of crushed granite from Hallowell . KNOX COUNTY . Knox ...
... road - bed . Similar gravel is found in the " Plains " southeast of the city . This gravel might be used to good advantage as a binder and top dressing for macadam roads built of crushed granite from Hallowell . KNOX COUNTY . Knox ...
Էջ 2
... Macadam surface stripped of fine material by automobile II . Fig . 1. - Application of tar to macadam road . Fig . 2. - Finished tar macadam ; untreated portion in foreground ...... . III . Fig . 1 .-- Application of oil to macadam ...
... Macadam surface stripped of fine material by automobile II . Fig . 1. - Application of tar to macadam road . Fig . 2. - Finished tar macadam ; untreated portion in foreground ...... . III . Fig . 1 .-- Application of oil to macadam ...
Էջ 3
... road construction is so pronounced that it seems safe to predict that the next ten years will see a decided change in the methods employed in building macadam roads . The necessity for a more complete knowledge of the characteristic ...
... road construction is so pronounced that it seems safe to predict that the next ten years will see a decided change in the methods employed in building macadam roads . The necessity for a more complete knowledge of the characteristic ...
Էջ 16
... traffic . For this reason it can be applied successfully to hard surfaces only , such as are pre- sented by well - swept macadam roads . The presence of moisture will also prevent the tar from penetrating the road , and as a cold ...
... traffic . For this reason it can be applied successfully to hard surfaces only , such as are pre- sented by well - swept macadam roads . The presence of moisture will also prevent the tar from penetrating the road , and as a cold ...
Common terms and phrases
Agriculture amount applied Approxi asphaltic Average cost barium chromate binding bitumen bridge built calcium chloride cementing value cent improved chemical clay coal coal tar coating concrete corrosion cost per mile counties report crude crushed cubic centimeter culverts depth determined diabase diameter diorite distillation Dollars dust preventives earth roads emulsions engineer feet feldspar foundation grams granite gravel gravel roads heated highway hornblende hydrometer igneous rocks improved roads inches iron Kind of stone limestone Location macadam macadam roads mate percentage metal method Mileage of improved mineral composition obtained Office of Public paraffin percentage of roads pigments plagioclase PLATE present public roads quarry quartzite Railroad facilities residue rhyolite road materials available road surface roads improved sample sand sand-clay roads schists Section solution spans specific gravity square yard steel Table tars temperature tion total mileage town traffic U. S. Dept Washington weight zinc
Սիրված հատվածներ
Էջ 19 - 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 5 - And whenever the commission shall be of opinion, after a hearing, had upon its own motion or upon complaint...
Էջ 17 - 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 20 - ... 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 3 - 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 27 - 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 18 - 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 5 - ... 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.
Էջ 7 - Binding power is thus, probably, the most important property to be sought for in a road-building rock, as its presence is always necessary for the best results. The hardness and toughness of the binder surface more than of the rock itself represents the hardness and toughness of the road, for if the weight of traffic is sufficient to destroy the bond of cementation of the surface, the stones below are soon loosened and forced out of place. When there is an absence of binding material, which often...