Bulletin, Ausgabe 3The Survey, 1904 |
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alumina amount analysis average ball-mill barrels boiling bricks briquettes burning burnt calcareous calcium carbonate calcium oxide carbon dioxide cement mixture cent Chatelier chemical clay base clay substance clinker coal composition compounds conveyor crusher crushing crystalline crystals deposited determined diameter dust feet feldspar ferric oxide filter formula furnace grained gram Griffin mill grinding ground hard hardening heat hence horsepower hydration hydrochloric acid ignition inches iron kaolin lime limestone machine magnesia magnesium marl material matter mesh sieve method minerals minutes mixed molecules mortar natural cement obtained Ohio oxygen particles plant Portland cement pounds pozzuolane practically precipitate produced quartz ratio reaction residue rock rolls Roman cement rotary kiln sample sand shale silica silicic acid SiO2 slag slag cement slaked soluble solution specific gravity stone sulphate sulphide sulphur temperature tensile strength tion tube mill vitrified volume washed weight
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Seite 359 - N0. 200 sieve, which, with pan and cover attached, is held in one hand in a slightly inclined position, and moved forward and backward, at the same time striking the side gently with the palm of the other hand, at the rate of about 200 strokes per minute. The operation is continued until not more than one-tenth of i per cent.
Seite 363 - The sand and cement should be thoroughly mixed dry. The mixing should be done on some non-absorbing surface, preferably plate glass. If the mixing must be done on an absorbing surface it should be thoroughly dampened prior to use.
Seite 357 - Method. — As a method to be followed for the analysis of cement, that proposed by the Committee on Uniformity in the analysis of Materials for the Portland Cement Industry, of the New York Section of the Society for Chemical Industry, and published in the Journal of the Society for January 15, 1902, is recommended.
Seite 356 - Chemical analysis may render valuable service in the detection of adulteration of cement with considerable amounts of inert material, such as slag or ground limestone. It is of use, also, in determining whether certain constituents, believed to be harmful when in excess of a certain percentage, as magnesia and sulphuric anhydride, are present in inadmissible proportions.
Seite 357 - Significance. — The specific gravity of cement is lowered by underburning, adulteration and hydration, but the adulteration must be in considerable quantity to affect the results appreciably.
Seite 364 - A moist closet consists of a soapstone or slate box, or a metal-lined wooden box — the metal lining being covered with felt and this felt kept wet. The bottom of the box is so constructed as to hold water, and the sides are provided with cleats for holding glass shelves on which to place the briquettes. Care should be taken to keep the air in the closet uniformly moist.
Seite 121 - NH3, or until there is but a faint odor of it, and the precipitated iron and aluminum hydrates, after settling, are washed once by decantation and slightly on the filter. Setting aside the filtrate, the precipitate is dissolved in hot dilute HCl, the solution passing into the beaker in which the precipitation was made.
Seite 361 - ... it is usual to measure arbitrarily the beginning and end of the setting by the penetration of weighted wires of given diameters.
Seite 362 - The determination of the time of setting is only approximate, being materially affected by the temperature of the mixing water, the temperature and humidity of the air during the test, the percentage of water used, and the amount of molding the paste receives.
Seite 366 - ... tend to lower the breaking strength. The load should not be applied too suddenly, as it may produce vibration, the shock from which often breaks the briquette before the ultimate strength is reached. Care must be taken that the clips and the sides of the briquette be clean and free from grains of sand or dirt, which would prevent a good bearing. The load should be applied at the rate of 600 Ibs. per minute. The average of the briquettes of each sample tested should be taken as the test, excluding...