Portland-cement Resources of IllinoisUniversity of Illinois, 1912 - 121 sayfa |
Diğer baskılar - Tümünü görüntüle
Portland-Cement Resources of Illinois Albert Bleininger,Edwin Fuller Lines,F E Layman Önizleme Yok - 2015 |
Sık kullanılan terimler ve kelime öbekleri
30 feet acid Alexander county alumina analyses argillaceous average blue bluff bluish Brown buff Bull Burlington calcareous calcium calcium oxide Calhoun county carbonate Cement Company cement manufacture Cement-rock cent chemical chert clinker coal composition creek crusher crystalline deposits Devonian Dolomite exposed exposure feet of limestone feet thick ferric oxide ferrous fine-grained fire clays fossiliferous fossils Genevieve Geol Geological formation GEOLOGICAL SURVEY grained gray grinding hard heat heavy bedded ILLINOIS STATE GEOLOGICAL impure inches thick Keokuk kiln Kimmswick Kinderhook layers ledges lime Limestone and shale Location logical formation Louis Louis limestone machine magnesia Magnesian limestone manufacture of Portland material maximum thickness McLeansboro miles north Mississippian mixture occur one-half mile outcrop Pennsylvanian PLATE Platteville portion Portland cement quarry quartz region residue river rocks Salem Salem limestone Sample taken Sandstone shale shaly sieve silica stone temperature thin bedded tion tube mill upper vitrification Warsaw yellowish
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Sayfa 16 - Portland cement, a brief consideration of the mineralogical structure of clay is necessary 'for the understanding of the chemical processes connected with the production of hydraulic silicates. DEFINITION OF CLAY. Clay may be defined as a complex derivative rock, generally of a soft and earthy nature, in which a mass of mineral debris of variable composition and amount is bonded and held together by a matrix of kaolin, or allied hydrous silicates of alumina. The distinguishing characteristics of...
Sayfa 24 - The dry pan, or edge runner, consists of a revolving pan from 6 to 9 feet in diameter, on which run two or more heavy mullers. Around the circumference a space of about 12 inches width is filled with perforated plates. The grinding is done on the solid plate, and the crushed material is scraped on to the perforated plates by fixed scrapers. The oversize material is thrown back on to the center of the pan to be crushed again. This machine is well suited for the intermediate grinding of dry shales...
Sayfa 37 - R2 03, in which the value of n = 3 to 4. A resume of the various theories proposed by different workers will be found in Bulletin 3, Fourth Series, Ohio Geological Survey.. A simple method of calculation, employed very generally in Europe, depends on the so-called hydraulic modulus which may be stated as follows: Per cent calcium oxide Per cent silica+per cent alumina+per cent ferric oxide 1 Recherches experimentales sur la constitution des mortiers hydrauligues: Annales des Mines, 1887 1 Jour.
Sayfa 31 - ILLINOIS STATE GEOLOGICAL SURVEY. BULL. NO. 17, PLATE IX. Kent mill, Maxecon type. FINE-GRINDING MACHINES. There are two principal types of fine-grinding machines : The tube mill. Centrifugal grinders.. TUBE MILL. The tube mill (PL X) consists essentially of an iron shell from 16 to 22 feet long and from 4 to 5 feet in diameter. It is lined with some hard material like flint and is filled somewhat above the axis with flint pebbles which weigh about one to three pounds each. This tube is supported...
Sayfa 33 - O.OGO per cent. A cement with 2.8 per cent free lime showed an expansion of 0.220 per cent in the same period. The effect of magnesia like that of lime depends less upon its total amount than upon the form in which it exists. Combined magnesia like combined lime has no injurious effect in Portland cement. Magnesia combined with silica and alumina forms a hydraulic cement which is safe but a,s compared with Portland cement is too weak to be of any commercial value. Free magnesia has no appreciable...
Sayfa 39 - ... be made empirically in any case. Once having established the best proportion of a mixture, the daily mixture can be calculated from the raw materials available by the following simple calculation: Let x=weight of limestone in charge. y=weight of clay in charge. a=per cent of calcium oxide in the limestone. b=per cent of calcium oxide in the clay. c=per cent of calcium oxide in the mixture. ax+by...
Sayfa 34 - C. the fluxing constituents, especially the ferric oxide, begin to act — -thus consolidating the mass — and more free silica is taken up. At about 1,250° C. this action proceeds more vigorously, the mass becomes harder and if allowed to cool would in many cases go down to dust, owing to the formation of the unstable form of the orthocalcium silicate. At from 1,350° to 1,500° C., according to the content of lime, the amount of iron and other fluxes, the fineness of grinding, etc., vitrification...
Sayfa 33 - The last named investigators1 probably offer the soundest view upon this subject, which is quoted as follows : "The effect of magnesia, like that of lime, depends less upon its total amount than upon the form in which it exists. Combined magnesia, like silica lime, has no injurious effect in Portland cement. Magnesia combined with silica and alumina forms a hydraulic cement which is safe but, as compared with Portland cement, is too weak to be of any commercial value. Free magnesia has no appreciable...
Sayfa 33 - Even where the cement is continuously in water the expansion due to free magnesia is not appreciable until after two months, and only becomes distinctly evident after a year. The hydration seems to be only well under headway at the end of the first year,, and expansion continues at an increasingly rapid rate for at least five years, and probably longer.
Sayfa 37 - ... roller housing. Both upper and lower bearings of the roller journal are provided with long, removable, phosphor-bronze bushings. The rollers are made of cast iron with chilled faces. The grinding is accomplished by the force of centrifugal motion throwing the rollers outward against the steel bull ring, A plow is located ahead of each roller and constantly throws a stream, of material between the face of the roller and the ring die. A fan is connected to this mill from which air is admitted underneath...