Physical and Chemical Tests on the Commercial Marbles of the United States

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U.S. Government Printing Office, 1919 - Marble - 54 pages

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Page 24 - In most cases it had not penetrated to the surface at the end of six hours. At the end of this time the solution was removed from the holes and the cubes were sawed in half, thus exposing the stained area.
Page 30 - the permanent expansion as well as the rate of expansion appears to become less for each successive heating, and the expansion for temperatures between 18' and 60░ C. appears to become almost negligible at the fifth and sixth heating." If rocks in general accumulate expansive strain caused by repeated heatings over moderate ranges, it seems not improbable that the strength of the rock would eventually be exceeded and fractures would then occur. It is important...
Page 28 - The tests registered below were made with a view of determining not merely the relative solubility of certain calcareous rocks used for building and ornamental work, but as well, the manner in which the solvent acted. The ultimate aim of the experiments, as is obvious, was to ascertain how the stones would withstand the effects of an atmosphere and its rainfall made acid through absorbed carbonic acid. To make the results appreciable within a reasonable time, it was of course necessary to exaggerate...
Page 6 - life" of different types of stone was based on observations of buildings and represents the period the stone will endure until disintegration renders it so unsightly in appearance that repair is necessary.
Page 28 - It will be noted that in some instances a stone losing a certain amount still retains a nearly smooth surface and sharp arrises. Others become roughened , granules loosened to the point of falling away, and the arrises, as a consequence, left ragged. In some of the stones there is a tendency for the smaller interstitial crystals to disappear, leaving the largerstanding in relief.
Page 28 - ... material both in weight and in percentage amounts. The first table gives the results of some preliminary tests which were not carried to completion, owing to imperfection of apparatus. They are, however, included here, since so far as they go they are confirmatory of those in the second . The results of both cases agree surprisingly well.
Page 29 - The considerable amount of insoluble material set free from these oolitic cubes during the trial setting to the bottom of the jar as mud or remaining to be brushed off the surface when the cube was dried seems to have come wholly from the oolites, and not from the interstices. It will be noted, as might have been expected, that the dolomitic marbles...
Page 51 - True Specific Gravity, Apparent Specific Gravity, Porosity, and Weight per Cubic Foot True specific gravity Apparent specific gravity Weight per cubic hut Ref.
Page 20 - After 48 hours the cubes were taken out one at a time, carefully dried with a towel, and immediately weighed. ,The increase in weight represents the amount of water absorbed.

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