Specifications for the Equitable Building: Broadway and Nassau Streets, Between Cedar and Pine Streets, New York City, N.Y.

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1913 - Office buildings - 302 pages
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Page 28 - 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 28 - 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 28 - Inches in diameter, one-half inch thick at centre, tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours. (a) A pat is then kept in air at normal temperature.
Page 28 - 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...
Page 28 - 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. 23. These pats, to satisfactorily pass the requirements, shall remain firm and hard, and show no signs of distortion, checking, cracking, or disintegrating.
Page 29 - ... 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. SULPHURIC ACID AND MAGNESIA. The cement shall not contain more than 1.75% of anhydrous sulphuric acid (SO3), nor more than 4% of magnesia (MgO).
Page 29 - ... in the proportion of one part of cement, two parts of sand and four parts of stone or gravel, or in such proportion as to produce a maximum density.
Page 28 - ... and tapering to a thin edge, shall be kept in moist air for a period of twenty-four hours. (a) A pat is then kept in air at normal temperature and observed at intervals for at least twenty-eight days.
Page 28 - 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. . Time of Setting. It shall not develop initial set in less than thirty minutes, and must develop hard set in not less than one hour, nor more than ten hours.
Page 27 - Uniform system for teste of cement " has been taken for a basis as far as I have been able to interpret it and the tests made in conformity with my preliminary report of January 5, 1891, which was approved.

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