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A similar pat is maintained in air at ordinary temperature and observed at intervals. A pat is exposed in any convenient way in an atmosphere of steam, above boiling water, in a loosely closed vessel, for 3 hours. To pass these tests satisfactorily, the pats should remain firm and hard, and show no signs of cracking, distortion, or disintegration. Should the pat leave the plate, distortion may be detected best with a straight-edge applied to the surface which was in contact with the plate. In the present state of our knowledge it cannot be said that cement should necessarily be condemned simply for failure to pass the accelerated tests; nor can cement be considered entirely satisfactory, simply because it has passed these. The Concrete Committee recommends that: All cement shall be inspected. Cement may be inspected either at the place of manufacture or on the work. 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 concrete blocked or raised from the ground.

The cement shall be stored in such a manner as to permit easy access for proper inspection and identification of each shipment. Every facility shall be provided by the contractor, and a period of at least twelve days allowed for the inspection and necessary tests. Cement shall be delivered in suitable packages, with the brand and name of manufacturer plainly marked thereon. A bag of cement shall contain 94 pounds of cement, net. Each barrel of Reinforced concrete and Portland cement shall contain 4 bags, and each barrel of natural cement shall contain 3 bags of the above net weight. Cement failing to meet the 7-day requirements may be held awaiting the results of the 28-day tests, before rejection. All tests shall be made in accordance with the methods proposed by the Concrete Committee on Uniform Tests of Cement of the American Society of Civil Engineers, presented to the Society January 21, 1903, and amended January 20, 1904, with all subsequent amendments thereto. The acceptance or rejection shall be based on the following requirements: Definition. This term shall be applied to the finely pulverized product resulting from the calcinations of an argillaceous limestone at a temperature only sufficient to drive off the carbonic acid gas. The specific gravity of the cement thoroughly dried at 1000 C., shall be not less than 2.8. It shall leave by weight a residue of not more than 10 percent on the No. 100, and 30 percent on the No. 200 sieve. 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.

The minimum requirements for tensile strength for briquettes one inch square in cross-section, shall be within the following limits, and shall show no retrogression in strength within the periods specified. 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 pat is then kept in air at normal temperature. Another is kept in water maintained as near 70� F. as practicable. These pats are observed at intervals for at least 28 days, and, to pass the tests satisfactorily, should remain firm

This term is applied to the finely pulverized product resulting from the calcinations to incipient fusion of an intimate mixture of properly proportioned argillaceous and calcareous materials, to which no addition greater than 3 percent has been made subsequent to calcinations. The specific gravity of the cement, thoroughly dried at 1000 C., shall be not less than 3. 10. It shall leave by weight a residue of not more than 8 percent on the No. 100 sieve, and not more than 25 percent on the No. 200 sieve. It shall develop initial set in not less than thirty minutes, and must develop hard set in not less than one hour or more than ten hours.