Bulletin, 3. ciltState of Ohio, Department of Natural Resources, Division of Geological Survey, 1904 |
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Sık kullanılan terimler ve kelime öbekleri
alumina amount analysis average ball-mill barrels blast 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 containing conveyor crusher crushing crystalline crystals deposit determined diameter dust feldspar ferric oxide filter formula furnace fused grains gram Griffin mill ground hard hardening heat hence horsepower hydration hydraulic hydrochloric acid ignition inches iron kaolin limestone magnesia magnesium marl material matter mesh sieve method minerals minutes mixed molecules mortar natural cement obtained Ohio oxygen particles pebbles plant Portland cement pounds pozzuolane practically precipitate produced quartz ratio reaction residue rock rolls Roman cement rotary kiln sand shale silica silicic acid slag slag cement slurry soluble solution specific gravity steam stone sulphate sulphur temperature tensile strength tion tube mill vitrified volume washed weight
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Sayfa 343 - What is the interest of $ 81, for 2 years 14 days, at £ per cent. ?_/ £ per cent. ? • | per cent. ? 2 per cent. ? — — 3 per cent. ? 4£ per cent. ? 5 per cent. ? 6 per cent. ? 7 per cent. ? 1$ per cent. ? 8 per cent.
Sayfa 377 - 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.
Sayfa 379 - Test pieces should be broken as soon as they are removed from the water. Care should be observed in centering the briquettes in the testing machine, as cross-strains, produced by improper centering, 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.
Sayfa 374 - Section 37, and quickly formed into a ball with the hands, completing the operation by tossing it six times from one hand to the other, maintained about 6 in.
Sayfa 371 - Cement made from very finely-ground material, and thoroughly burned, may contain much more lime than the amount usually present and still be perfectly sound. On the other hand, cements low in lime may, on account of careless preparation of the raw material, be of dangerous character. Further, the ash of the fuel used in burning may so greatly modify the composition of the product as largely to destroy the significance of the results of analysis...
Sayfa 373 - 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. The operation is continued until not more than one-tenth of one per cent, passes through after one minute of continuous sieving.
Sayfa 380 - Fahr.) and upward. The test pieces should be allowed to remain 24 hours in moist air before immersion in water or steam, or preservation in air.
Sayfa 376 - 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.
Sayfa 380 - ... 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...
Sayfa 371 - Apparatus and Method. — The determination of specific gravity is most conveniently made with Le Chatelier's apparatus. This consists of a flask (D), Fig.