SLAG CEMENT. REQUISITES AND TREATMENT OF THE SLAG. 643 



TABLE 243. 

 ANALYSES OF SLAGS USED FOR SLAG CEMENT. 



Analyses of a number of slags used in slag-cement manufacture are 

 shown in Table 243. The analyses of foreign slags are quoted from 

 various reliable authorities and the analyses of the Illinois Steel Com- 

 pany slags have been selected from a large series published in the 

 report of the U. S. Army Board of Engineers to show the extreme 



ranges of the different elements. The ratios 



and 



have 



been calculated for each slag and are shown in this table. 



From these data it can be seen that the ratio of alumina to silica 

 is carried very high at Choindez, and is rather low at Chicago, rela- 

 tively to most of the European plants. It must be remembered, how- 



