Brayton Standards: A Pocket Companion for the Uniform Design of Reinforced Concrete

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1907 - 131 Seiten
 

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Seite 128 - 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...
Seite 127 - No. 100, and not more than 25% on the No. 200 sieve. TIME OF SETTING. 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.
Seite 127 - 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.
Seite 127 - 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.
Seite 5 - On this day of 19 .... before me personally appeared , to me known to be the person described in and who executed the foregoing instrument, and acknowledged that he executed the same as his free act and deed.
Seite 127 - 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.
Seite 128 - Constancy of Volume. 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. (a) A pat is then kept in air at normal temperature and observed at intervals for at least 28 days.
Seite 68 - that the "compressive resistance of a hooped member exceeds the sum of the following three elements : — "1. Compressive resistance of the concrete without reinforcing. "2. Compressive resistance of the longitudinal rods stressed to their elastic limit. "3. Compressive resistance which could have been produced by imaginary longitudinals at the elastic limit of the hooping metal, the volume of the imaginary longitudinals being taken as 2.4 times that of the hooping.
Seite 127 - TIME OF SETTING. It shall develop initial set in not less than ten minutes, and hard set in not less than thirty minutes, nor more than three hours.
Seite 68 - The compressive resistance which would have been produced by the imaginary longitudinals at the elastic limit of the hooping metal, the volume of the imaginary longitudinals being taken as 2-4 times that of the hooping (page 240).

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