A Treatise on Masonry Construction

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J. Wiley & sons, 1909 - Masonry - 745 pages
 

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Page 723 - Pats of neat cement about three inches in diameter, one half inch thick at the center, and tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours.
Page 65 - Method. — As a method to be followed for the analysis of cement, that proposed by the Committee on Uniformity in the analysis of Materials for the Portland Cement Industry, of the New York Section of the Society for Chemical Industry, and published in the Journal of the Society for January 15, 1902, is recommended.
Page 71 - ... water shall be poured ; the material on the outer edge shall be turned into the crater by the aid of a trowel.
Page 723 - The minimum requirements for tensile strength for briquettes one inch square in section shall be within the following limits, and shall show no retrogression in strength within the periods specified : Age. Neat Cement. . Strength. 24 hours in moist air 175 Ibs.
Page 722 - In order to allow ample time for inspecting and testing, the cement should be stored in a suitable weather-tight building having the floor properly blocked or raised from the ground.
Page 723 - FINENESS. It shall leave by weight a residue of not more than 8 per cent on the No. 100, and not more than 25 per cent on the No. 200 sieve.
Page 64 - SIGNIFICANCE. — Chemical analysis may render valuable service in the detection of adulteration of cement with considerable amounts of inert material, such as slag or ground limestone. It is of use, also, in determining whether certain constituents, believed to be harmful when in excess of a certain percentage, as magnesia and sulphuric anhydride, are present in inadmissible proportions.
Page 722 - This term shall be applied to the finely pulverized product resulting from the calcination of an argillaceous limestone at a temperature only sufficient to drive off the carbonic acid gas.
Page 722 - The cement shall be stored in such a manner as to permit easy access for proper inspection and identification of each shipment. (5) Every facility shall be provided by the contractor and a period of at least twelve days allowed for the inspection and necessary tests.
Page 723 - This term is applied to the finely pulverized product resulting from the calcination to incipient fusion of an intimate mixture of properly proportioned argillaceous and calcareous materials, and to which no addition greater than 3% has been made subsequent to calcination.

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