. Standard methods of testing and specifications for cement. ?---^ •4^!^ Fig. 4.—Correct Method of Molding Cement Pat midity of the moist closet in which the test pieces are stored mayalso affect the setting somewhat. Tensile Tests.—Consistent results can only be obtained byexercising great care in molding and testing the briquettes. Thecorrect method of filling the mold is shown in Figs. 7 and 8. Intesting, the sides of the briquettes and the clips should be thoroughlycleaned and free from grains of sand or dirt which would preventa good bearing, and the briquette should be carefully centered
. Standard methods of testing and specifications for cement. ?---^ •4^!^ Fig. 4.—Correct Method of Molding Cement Pat midity of the moist closet in which the test pieces are stored mayalso affect the setting somewhat. Tensile Tests.—Consistent results can only be obtained byexercising great care in molding and testing the briquettes. Thecorrect method of filling the mold is shown in Figs. 7 and 8. Intesting, the sides of the briquettes and the clips should be thoroughlycleaned and free from grains of sand or dirt which would preventa good bearing, and the briquette should be carefully centered inthe clips so as to avoid cross strains. It may be considered goodlaboratory practice if the individual briquettes of any set do notshow a greater variation from the mean value than 8 per cent forsand mixtures and 12 per cent for neat mixtures. 24 GOVERNMENT SPECIFICATION FOR PORTLAND CEMENT IV. AUXILIARY SPECIFICATIONS Bureau of Standards Sieve SpecificationsWire cloth for standard sieves for cement and sand shall be woven (not twilled) from bra
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