The Manufacture of Hydraulic Cements |
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alumina amount analysis average ball-mill barrels blast boiling bricks briquettes burning burnt calcium carbonate calcium oxide carbon dioxide cement kiln cement mixture cent Chatelier chemical clay base clay substance clinker coal composition compounds conveyor cooled crucible crusher crushing determined diameter dust feet feldspar ferric oxide filter formula furnace fused grains gram Griffin mill grinding machine ground hard hardening heat hence horsepower hydration hydraulic hydrochloric acid ignition inches iron kaolin limestone magnesia magnesium manufacture marl material matter mesh sieve method minerals minutes molecules natural cement obtained Ohio particles pebbles pipe plant Portland cement pounds pozzuolane practically precipitate produced quartz ratio residue rock rolls Roman cements rotary kiln sample sand shale silica slag slag cement slaked lime slurry soluble solution specific gravity steam stone sulphur temperature tensile strength tion tube mill vitrified volume washed weight
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Page 361 - 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.
Page 355 - 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.
Page 354 - 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.
Page 355 - 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.
Page 362 - 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.
Page 129 - 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.
Page 357 - The thoroughly dried and coarsely screened sample is weighed and placed on the No. 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.
Page 359 - The paste is of normal consistency when the cylinder penetrates to a point in the mass 10 mm. (0.39 in.) below the top of the ring. Great care must be taken to fill the ring exactly to the top.
Page 356 - Significance. — It is generally accepted that the coarser particles in cement are practically inert, and it is only the extremely fine powder that possesses adhesive or cementing qualities. The more finely cement is pulverized, all other conditions being the same, the more sand it will carry and produce a mortar of a given strength.
Page 129 - NH4OH boiled, and the second precipitate collected and washed on the same filter used in the first instance. The filter paper, with th.e precipitate, is then placed in a weighed platinum crucible, the paper burned off and the precipitate ignited and finally blasted...