 | Geology - 1905 - 830 pages
...the following paragraphs: Natural cement*. — Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica. alumina, and iron oxide, at a comparatively low temperature, usually about that of ordinary lime burning. The operation can... | |
 | Edwin Clarence Eckel - Cement - 1904 - 148 pages
...to one part of clayey material. NATURAL CEMENTS. Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent. of silica, alumina, and iron oxide. This burning takes place at a comparatively low temperature, about that of ordinary lime burning. The... | |
 | United States - 1904 - 1040 pages
...result is quite different. Natural cements. — Natural ceuients are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide, at a comparatively low temperature, about that of ordinary lime burning. The operation can therefore... | |
 | Geology - 1904 - 768 pages
...result is quite different. Xatural cement*.— Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide, at a comparatively low temperature, about that of ordinary lirne burning. The operation can therefore... | |
 | Samuel Franklin Emmons - Geology, Economic - 1905 - 648 pages
...the following paragraphs: Natural cement x. — Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide, at a comparatively low temperature, usually about that of ordinary lime burning. The operation can... | |
 | Geological Survey (U.S.) - Geology - 1905 - 462 pages
...result is quite différent. Natural cements. — Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide, at a comparatively low temperature, about that of ordinary lime burning. The operation can therefore... | |
 | Edwin Clarence Eckel - Cement - 1905 - 802 pages
...the true limes and the cements proper. 2. Natural cements are produced by burning a natural clayey limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide. This burning takes place at a temperature that is usually little if any above that of an ordinary lime-kiln.... | |
 | Heinrich Ries - Clay - 1906 - 690 pages
...cements. 3. Puzzolan cements. Natural cements. — Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent, of silica, alumina, and iron oxide, at a comparatively low temperature, about that of ordinary lime burning. The operation can therefore... | |
 | Mississippi Geological, Economic, and Topographical Survey - Geology - 1907 - 512 pages
...greatly reduce the temperature of incipient fusion. Natural Cement. Natural cement is produced by burning an impure limestone containing from 15 to 40 per cent of silica, alumina and iron oxide. In addition to these ingredients it usually contains a small per cent of alkalies, sulphur trioxide... | |
 | William Tudor Griswold - Geology - 1908 - 602 pages
...proportions. Usually this combination is made by mixing limestone or marl with clay or shale, and in such a mixture should contain about three parts of...the product of an impure limestone containing from !."> to 40 per cent of silica, alumina, and iron oxide. Calcareous and argillaceous rocks suitable... | |
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Natural cements are produced by burning a naturally impure limestone, containing from 15 to 40 per cent of silica, alumina, and iron oxide, at a comparatively low temperature, about that of ordinary lime burning. The operation can therefore be carried... 
