 | Digital images - 1912 - 1256 pages
...usually yellow to brown in color and relatively fight in weight, having a specific gravity of 2.7 to 3.1; Portland cement is commonly blue to gray in color and heavier, its specific gravity rangingfrom 3 to 3.2. 4. Natural cements set more rapidly than Portland cement but do not quickly attain... | |
 | Edwin Clarence Eckel - Portland cement - 1913 - 458 pages
...rule, yellow to brown in color and light in weight, having a specific gravity of 2.7 to 3.1, whereas 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... | |
 | Henry Parker Willis, John R. B. Byers - Portland cement - 1924 - 152 pages
...point. yellow to brown in color and light in weight, having a specific gravity of 2.7 to 3.1, whereas 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 cements but 5. Portland cement is a definite... | |
 | United States. Bureau of Mines - Digital images - 1911 - 1048 pages
...are usunlly yellow to brown in color and light in weight, having a specific gravity of 2.7 to 3.1; 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... | |
 | United States. Bureau of Mines - Mineral industries - 1912 - 1256 pages
...usually yellow to brown in color and relatively fight in weight, having a specific gravity of 2.7 to 3.1; Portland cement is commonly blue to gray in color and heavier, its specific gravity rangingfrom 3 to 3.2. 4. Natural cements set more rapidly than Portland cement but do not quickly attain... | |
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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... 
