Bulletin, Ausgabe 17University of Illinois, 1912 |
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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 oolitic 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 vitrification Warsaw yellowish
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Seite 57 - One Part Cement, Three Parts Standard Ottawa Sand. 7 days (1 day in moist air, 6 days in water) ...200 Ibs.
Seite 57 - The minimum requirements for tensile strength for briquettes one square inch in cross section shall be as follows and the cement shall show no retrogression in strength within the periods specified.
Seite 40 - VI) is the one most generally used, and its crushing action depends upon gyrating, vertical spindle, the upper part of which has the shape of a truncated cone. The latter rotates within a conical space- representing an inverted cone. The crushing is continuous between the crushing surfaces, and the spindle follows an eccentric. This causes the head to approach and recede from the concave grinding surface of the shell surrounding the cone. The movement at the bottom of the truncated cone is greater...
Seite 16 - 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 clays as a class are, first, plasticity when ground and mixed with sufficient amount of water; and second, the property of hardening by heat to form strong and durable silicates. This definition is not exact, for there...
Seite 39 - Owing to the fact that a great amount of data is now available concerning the composition of Portland cements, this method of calculation is justifiable and practical; any changes involving a decrease or an increase in the amount of lime must 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....
Seite 40 - ... between pebbles and the charge takes place anywhere except at the point where the pebbles strike the surface on falling from the highest point. The pebbles climbing up the side of the mill drop away from it as soon as the vertical component of the forces acting upon It is equal to the centrifugal force. "The grinding effect depends on the vertical distance of the drop, the velocity of the drum, and weight and number of the pebbles.
Seite 40 - ... 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...
Seite 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.
Seite 40 - Not constant in volume (does not stand boiling test.) Store longer. Decrease lime content or increase content of ferric oxide, or increase silica content in clay base; grind raw mixture finer; reduce sulphur content. Tendency to dust. Increase lime content; quench clinlter in water or cool rapidly in air; add ferric oxide to raw mix.
Seite 23 - ... will be unnecessary. 3. Fire Clays. — This is a somewhat indefinite term, standing in general for clays which do not melt at high temperatures. A great deal of confusion prevails in regard to the conception of high temperatures among practical men. Though no definite limit has ever been put down, it may be said that no clay can be called a fire clay or refractory clay unless it stands a temperature approximately 3000° F. or 1650° C, expressed in the scale of fusible cones adopted by Seger...