. Value of the high-pressure steam test of portland Fig. la.—Neat cement prisms after storing for two years in air under cover All of the above prisms contained cement that passed the standard atmospheric steam test butfailed in high-pressure steam at the time the prisms were molded. These prisms were merely storedin air and never treated in steam. Note the warping of all prisms and the partial disintegrationof one prism marked 5-378, which broke in handling. FiG. ib.—Effect of high-pressure steam on neat cement and mortar briquets All of the above half briquets contained cement that
. Value of the high-pressure steam test of portland Fig. la.—Neat cement prisms after storing for two years in air under cover All of the above prisms contained cement that passed the standard atmospheric steam test butfailed in high-pressure steam at the time the prisms were molded. These prisms were merely storedin air and never treated in steam. Note the warping of all prisms and the partial disintegrationof one prism marked 5-378, which broke in handling. FiG. ib.—Effect of high-pressure steam on neat cement and mortar briquets All of the above half briquets contained cement that failed in the high-pressure steam test. Halfbriquets on the left are composed of 1:3 standard sand mortar. The one on the extreme left hasbeen treated in steam at 180 pounds pressure for five hours, while the other half has not beentreated. Half briquets on the right are composed of neat cement. The left one has been treatedin steam at 180 pounds pressure for five hours, while the extreme right one has not been treated insteam Value of High-Pressure Steam Test of Cement n a shot-testing machine. A cement was said to pass this testwhen the treated briquettes exhibited greater strength than theuntreated ones. Throughout this paper cements are classifiedinto three types, respectively: (i) A cement which fails to pass the standard atmosphericsteam test. (2) A cement which passes the atmospheric steam test but failswhen treated in high-pressure steam. (3) A cemen
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