Lime and Cement Industries of New YorkUniversity of the State of New York, 1901 - 968 páginas |
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Lime and Cement Industries of New York Edwin Clarence Eckel,Heinrich Ries Sin vista previa disponible - 2015 |
Términos y frases comunes
28 days Akron Alkalis Alumina anal ANALYSES OF LIMESTONES ANALYST OWNER LOCATION barrels Becraft Binnewater brand briquets Bros Buffalo Calciferous Catskill cement rock Chazy clinker Corniferous county¹ creek crystalline dolomite facing FeCO3 feet thick Ferric oxid furnace Glens Falls grained gray grinding Helderberg limestone Hudson hydraulic cement Hydraulic limes illus impurities iron kiln layers Lime carbonate limestone limestone formations LOCATION AND REMARKS Lower Helderberg Magnesia Magnesium carbonate marble marl material mesh miles mill mixed mixture MnO2 mold mortar N. Y. state geol natural cements natural rock cement neat cement Onondaga Onondaga county outcrops Pentamerus plant Plate Portland cement pounds pt 6 cont'd quarry REFERENCE AND ANALYST rep't rep't N. Y. Ries river Rondout Rosendale sand shaly sieve Silica SiO2 slaking square inch stone sulfate tensile strength Trenton Trenton limestone U. S. geol Ulster Ulster county upper valley Waterlime Williston Willsboro York เเ
Pasajes populares
Página 740 - One of these cakes, when hard enough, should be put in water, and examined from day to day to see if it becomes contorted, or if cracks show themselves at the edges, such contortions or cracks indicating that the cement is unfit for use at that time. In some cases the tendency to crack, if caused by the presence of too much unslacked lime, will disappear with age.
Página 750 - For this purpose the drying closets in use in chemical laboratories1 may be utilized. If after this treatment the cakes show no edge cracks, the cement is to be considered in general of constant volume. If such cracks do appear the cement is not to be condemned, but the results of the decisive test with the cakes hardening on glass plates under water must be waited for. It must, however, be noticed that the heat test does not admit of a final conclusion of the constancy of volume of those cements...
Página 881 - ... this that an argillaceous limestone (cement rock) mixed with a comparatively small quantity of purer limestone, as in the Lehigh plants, requires less thorough mixing and less fine grinding than when a mixture of limestone and clay (or marl and clay) is used, for even the coarser particles of the argillaceous limestone will vary so little in chemical composition from the proper mixture as to affect the quality of the resulting cement but little should either mixing or grinding be incompletely...
Página 754 - The degree of fineness to which the cement must be ground is not specified, it being considered that very fine grinding increases the strength chiefly during the duration of the tests, and that the subsequent increase of strength is less with fine than with coarse cement.
Página 742 - In selecting cement for experimental purposes, take the samples from the interior of the original packages, at sufficient depth to insure a fair exponent of the quality, and store the same in tightly closed receptacles impervious to light or dampness until required for manipulation, when each sample of cement should be so thoroughly mixed, by sifting or otherwise, that it shall be uniform in character throughout its mass.
Página 741 - If satisfactory results are obtained with a full dose of sand, the trials need go ' no further. If not, the coarser particles should first be excluded by using a No. 100 sieve, in order to determine approximately the grade the cement would take if ground fine; for fineness is always attainable, while inherent merit may not be.
Página 742 - One year; one day in air, the remainder in water, from 200 pounds to 350 pounds. Standards of minimum fineness and tensile strength for Portland cement, as given below, have been adopted in some foreign, countries. In Germany, by Berlin society of architects, Society of manufacturers of bricks, lime and cement, Society of contractors, and Society of German cement-makers.
Página 742 - The slow setting natural cements should not become warm while setting, but the quick setting ones may, to a moderate extent, within the degree producing cracks. Cracks in Portland cement indicate too much carbonate of lime, and in the Vicat cements too much lime in the original mixture. SAMPLING There is no uniformity of practice among engineers as to the sampling of the cement to be tested, some testing every tenth barrel, others every fifth, and others still every barrel delivered. Usually, where...
Página 865 - Portland cement co. and the works were almost entirely rebuilt, a much larger output being secured by the improvements then introduced. Since that date the plant has been in constant operation, with the exception of stops aggregating only some five or » ., six weeks in all, caused by fires. The materials used are marl and clay, obtained from a swamp in the vicinity of Warners, the present workings being located about £ of a mile from the works.
Página 738 - THE testing of cement is not so simple a process as it is sometimes thought to be. No small degree of experience is necessary before one can manipulate the materials so as to obtain even approximately accurate results. The first tests of inexperienced, though intelligent and careful, persons, are usually very contradictory and inaccurate, and no amount of experience can eliminate the variations introduced by the personal equations of the most conscientious observers.