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" ... (2) Natural cements, after burning and grinding, are usually yellow to brown in color and light in weight, their specific gravity being about 2.7 to... "
Bulletin - Seite 334
1904
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Mineral Resources, Ausgaben 21-25

Geological Survey of New South Wales - 1916 - 1292 Seiten
...cement is commonly blue to grey in colour and heavier, its specific gravity ranging from 3-0 to 3-2. " (3) Natural cements are always burned at a lower temperature...much lower temperature, the mass of rock in the kiln rarely being heated high enough to even approach the fusing or clinkering point. " (4) In use natural...
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Bulletin, Ausgaben 260-261

1905 - 830 Seiten
...usually yellow to brown in color and light in weight, having a specific gravity of ^.7 to 3.1, while Portland cement is commonly blue to gray in color and heavier, its specific gravity ranging from 3 to 3.2. (i) Natural cements set more rapidly than Portland cement, but do not attain so high a tensile...
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The Materials and Manufacture of Portland Cement

Edwin Clarence Eckel - 1904 - 148 Seiten
...yellow to brown in color and light in weight, their specific gravity being about 2.7 to 2.9; while Portland cement is commonly blue to gray in color...to 3.2. (3) Natural cements are always burned at a lowej temperature than Portland, and common!}' at a much lower, temperature, the mass of rock in the...
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Experiments on Schistosity and Slaty Cleavage

George Ferdinand Becker - 1904 - 732 Seiten
...grinding, are usually yellow to brown and light in weight, their specific gravity being about 2.7 to 2.0; Portland cement is commonly blue to gray in color and heavier, its specific gravity ranging from 8.0 to 3.2. (3) Natural cements are always burned at a lower temperature than Portland, and commonly...
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Congressional Serial Set, Ausgabe 4690

1904 - 1040 Seiten
...usually yellow to brown in color and light in weight, having a specific gravity of 2.7 to 3.1, while Portland cement is commonly blue to gray in color and heavier, its specific gravity ranging from 3 to 3.2. (4) Natural cements set more rapidly than Portland cement, but do not attain so high tensile...
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Bulletin of the United States Geological Survey

Geological Survey (U.S.) - 1905 - 462 Seiten
...cements are made by burning masses of natural rock, not by burning carefully prepared and fineljground artificial mixtures. (2) Natural cements, after burning...kiln never being heated high enough to even approach (he fusing or clinkering point. (-Í) Natural cements set more rapidly than Portland cement, but do...
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Cements, Limes, and Plasters: Their Materials, Manufacture, and Properties

Edwin Clarence Eckel - 1905 - 796 Seiten
...yellow to brown in color and light in weight, their specific gravity being about 2.7 to 3.10, while Portland cement is commonly blue to gray in color...much lower temperature, the mass of rock in the kiln rarely being heated high enough to even approach the fusing- or clinkering-point. (4) In use natural...
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Iowa Geological Survey, Band 15

1905 - 602 Seiten
...yellow to brown in color and light in weigbt, their specific gravity being about 2.7 to 2.9; while Portland cement is commonly blue to gray in color...always burned at a lower temperature than Portland, acd commonly at a much lower temperature, the mass of rock in the kiln never being heated high enough...
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Contributions to Economic Geology, 1904

Samuel Franklin Emmons - 1905 - 648 Seiten
...usually yellow to brown in color and light in weight, having a specific gravity of '2."! to 3.1, while Portland cement is commonly blue to gray in color and heavier, its specific gravity ranging from 3 to 3.2. (4) Natural cements set more rapidlv than Portland cement, but do not attain so high a tensile...
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Bulletin of the United States Geological Survey

Geological Survey (U.S.) - 1905 - 644 Seiten
...usually yellow to brown in color and light in weight, having a specific gravity of '2.7 to 3.1, while Portland cement is commonly blue to gray in color and heavier, its specific gravity ranging from 3 to 3.2. (i) Natural cements set more rapidly than Portland cement, but do not attain so high a tensile...
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