14 
BULLETIN 555, U. S. DEPARTMENT OF AGRICULTURE. 
Physical prop- 
erties. 
Chips or 
>'o. slag. 
SPECIFICATION FOR BROKEN SLAG FOR BITUMINOUS MACADAM. 
General. The broken slag shall consist of angular fragments of 
_ (I nsert typer a ll owable) s i ag , reasonably uniform in 
density and quality, free from metallic iron, thin or elongated 
pieces, dirt, or other objectionable matter, occurring either free 
or as a coating on the slag. 
The slag shall meet the following requirements: 
Weight per cubic foot not less than pounds. 
Per cent of wear not more than 
{or French coefficient not less than ) 
That portion of the product of the crusher which, when tested 
by means of laboratory screens, will meet the following require- 
ments : 
Per cent. 
Passing -inch screen 100 
Total passing -inch screen to 
Retained on -inch screen 100 
That portion of the product of the crusher which, when tested 
by means of laboratory screens, will meet the following require- 
ments : 
Per cent. 
Passing -inch screen 100 
Total passing -inch screen to 
Retained on -inch screen 100 
That portion of the product of the crusher which, when tested 
by means of laboratory screens, will meet the following require- 
ments : 
Per cent. 
Passing -inch screen 100 
Total passing -inch screen to 
Retained on -inch screen 100 
Slag shall be sampled for quality and size in accordance with 
the method described on page , paragraphs , of these 
specifications. 
Tests of the physical properties and sizes of the slag shall be 
made in accordance with the methods described or referred to on 
pages of these specifications, tests Nos. 
Top course or 
No. — slag;. 
Bottom course 
or No. slag. 
Method of sam- 
pling. 
Methods of 
testing. 
SPECIFICATION FOR BROKEN SLAG AGGREGATE FOR LARGE AGGREGATE 
BITUMINOUS CONCRETE. 
General. 
Physical prop- 
erties. 
Grading. 
The broken slag aggregate shall consist of angular fragments of 
(insert types allowable) slag, reasonably uniform in density and 
quality, free from metallic iron, thin or elongated pieces, dirt, or 
other objectionable matter, occurring either free or as a coating 
on the slag. 
The slag shall meet the following requirements : 
Weight per cubic foot not less than pounds 
Per cent of wear not more than 
{or French coefficient not less than ) 
The broken slag aggregate, when tested by means of laboratory 
screens, shall meet the following requirements : 
Per cent. 
Passing Uh e largest size selected) i nc h screen. 100 
