Eckel.] UTILIZATION OF IRON AND STEEL SLAGS. 231 
are unsuitable for use as macadam for highway construction. It is 
therefore evident that almost any type of slag will be of service for 
one of these two uses. 
LAND RECLAMATION. 
In the vicinity of furnaces slag is of considerable local importance 
as a cheap and readily transportable material for filling purposes. 
Large quantities are annually used for land reclamation, filling of 
abandoned mine workings, etc. The greater part of the slag so used 
is, however, given away by the furnaces, and such uses may, there- 
fore, be regarded rather as a means of inexpensively disposing of a 
troublesome waste product than as a utilization of slag. Such meth- 
ods of disposal are, of course, economical only when the slags are 
unfit for the more profitable utilizations discussed in the preceding 
seel ions of this paper. 
