Practical Treatise On Limes Hydraulic Cements And Mortars Containing Reports
Practical Treatise On Limes Hydraulic Cements And Mortars Containing Reports
Quincy Adams Gillmore
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152 PRACTICAL TREATISE ON LIMES, the same composition, is subject to singular and apparently capricious variations during the progress of calcination. Al- though the diagram, Figure 28, does not exhibit the charac- teristic peculiarities in this respect of all the individual layers of any one quarry, experiments to elucidate this feature have been carried on with considerable minuteness of detail, and show quite conclusively that the principal, and it may be said, the only cause of the frequent... failure to attain uniform results by any known method of calcination, lies in the obscure, because unstudied changes in hydraulic character, through which the stone successively passes during the burning. There are, it is true, many layers of stone that yield a really good and energetic cement at any and all stages of cal- bome cements are * good at all stages cination between the points of half calcination and complete vitrification ; and it luckily so hap- pens, so far as recent observation teaches, that this kind of stone is very extensively distributed throughout the country, and comprises at least one-half of the thickness of the deposits to which we now look for our supply, viz.
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