The Philippine journal of science . water. On the other hand, as the burned brickscontained no carbon dioxide, the raw materials had beenthoroughly calcined. Mixture 3 slaked the least and 4 the most. In all probability,better results would have been obtained by burning the mixtures White, Alfred H., Journ. hid. & Eng. Chem. (1909), 1, 5; Reibling,W. C, and Reyes, F. D., This Journal, Sec. A (1910), 5, 367-419. 126870 5 170 The Philippine Journal of Science 1914 with the highest cementation index at a low temperature andvice versa. However, there was no opportunity to make otherthan a rather p
The Philippine journal of science . water. On the other hand, as the burned brickscontained no carbon dioxide, the raw materials had beenthoroughly calcined. Mixture 3 slaked the least and 4 the most. In all probability,better results would have been obtained by burning the mixtures White, Alfred H., Journ. hid. & Eng. Chem. (1909), 1, 5; Reibling,W. C, and Reyes, F. D., This Journal, Sec. A (1910), 5, 367-419. 126870 5 170 The Philippine Journal of Science 1914 with the highest cementation index at a low temperature andvice versa. However, there was no opportunity to make otherthan a rather preliminary examination of the possibilities ofthese raw materials in the artificial process of manufacture. The burned bricks were soft and easy to grind. They wereaerated for twenty-four hours in the laboratory, pulverized, andtested for fineness, specific gravity, soundness in steam, andsetting properties. The results obtained are recorded in Table VI. Table VI.—Physical characteristics of the four artificial Roman cements. Tested according to the 1912 United States Specification for Portland cement. The figures in parenthesis give the percentage of water required for a paste of normalconsistency. Standard specifications do not require that natural cementspass the accelerated tests for soundness, but all of these cementsremained sound when subjected to the regular steaming testfor Portland cements. The nonplastered, nonseasoned cementsfailed to harden sufficiently within twelve hours to bear theweight of the heavy Gilmore needle without showing the markof the point. On the other hand, all of the cements gained theirfinal set in less than ten hours, which must be considered verysatisfactory for natural cements tested by the Gilmore method. The setting properties of these cements were again testedafter they had aerated for eighteen hours, spread out on paperin layers about 1 centimeter thick. The results obtained aregiven in Table VII. As anticipated, seasoning had the desire
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