Action of the salts in alkali water and sea water on cements. . d afteragitation with the cement. For this reason also the determina-tions were discontinued, as the time available did not allow forsuch careful work when there was apparently no use for it. The silica, iron, and aluminum oxides were determined regu-larly, but in no case did the percentage removed amount to morethan Per cent and usually about one-half that. Of coursewhen sodium carbonate was present this does not apply, as thesilica was removed in considerable quantities. (See Table 3 andFig. 9.) Alumina was removed in ver
Action of the salts in alkali water and sea water on cements. . d afteragitation with the cement. For this reason also the determina-tions were discontinued, as the time available did not allow forsuch careful work when there was apparently no use for it. The silica, iron, and aluminum oxides were determined regu-larly, but in no case did the percentage removed amount to morethan Per cent and usually about one-half that. Of coursewhen sodium carbonate was present this does not apply, as thesilica was removed in considerable quantities. (See Table 3 andFig. 9.) Alumina was removed in very much less is somewhat contrary to the usual opinion, though Candlot7has called attention to it. It was, therefore, thought advisable to make an analysis of theresidue and to compare this residue with a residue calculated fromthe amounts of lime, magnesia, and sulphuric anhydride removedor precipitated during the various periods. In making these cal- 7 Candlot, Ciment et Chaux Hydrauliques, p. 312. Action of Alkali and Sea Water on Cements 31. Q3± VIS3N3VW 30 30VJLN30H3d 764120—13- 32 Technologic Papers of the Bureau of Standards dilations it was assumed that no chlorine, sodium oxide, silica,iron, or alumina was absorbed or in any way removed from thesolution or cement, excepting the sodium carbonate series. Inpreparing the residue for analysis, after the removal of the lastsolution as completely as possible, there was usually remainingfrom 50 to 100 grams. The residue plus the remaining solutionwas weighed and then evaporated at 1030 to constant weight in acurrent of air free from carbon dioxide. Thus it is seen that noattempt was made to remove, by washing out with pure water, thesolution remaining on the residue. This would also have removedsome of the other material than the salts in the solution. But asthe wTeight and composition of this latter was known, it was a
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