Cement Houses and how to Build Them: Illustrated Details of Construction, Standard Specifications for Cement ... : Perspective Views and Floor Plans of Concrete Block and Cement Plaster Houses

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Radford Architectural Company, 1909 - Architecture, Domestic - 170 pages
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Page 8 - F. as practicable, and observed at intervals for at least 28 days. (c) A third pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel for five hours. These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking, or disintegrating.
Page 8 - 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.
Page 8 - 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 32 - ... the Committee recommends the natural sand from Ottawa, 111., screened to pass a sieve having 20 meshes per linear inch and retained on a sieve having 30 meshes per linear inch; the wires to have diameters of 0.0165 and 0.0112 in., respectively, ie, half the width of the opening in each case.
Page 18 - For the purposes of the tests, at least twelve (12) samples or test pieces must be provided. Such samples must represent the ordinary commercial product and may be selected from stock by the bureau of building inspection, or in the absence of such a bureau, by the architect or engineer in charge.
Page 8 - It shall develop initial set in not less than thirty minutes, but must develop hard set in not less than one hour, nor more than ten hours.
Page 8 - 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.
Page 17 - Tests, but the expense of conducting the Freezing and Fire Tests will not be imposed upon the Manufacturer of said blocks. The test samples must represent the ordinary commercial product, of the regular size and shape used in construction. The samples may be tested as soon as desired by the applicant, but in no case later than sixty days after manufacture.
Page 17 - Any and all blocks, samples of which, on being tested under the direction of the Bureau of Building Inspection, fail to stand at twenty-eight (28) days the tests required by this regulation, shall be marked " condemned" by the manufacturer or user, and shall be destroyed.
Page 8 - 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.

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