14 



BULLETIN 555, U. S. DEPARTMENT OF AGRICULTURE. 



SPECIFICATION FOR BROKEN SLAG FOR BITUMINOUS MACADAM. 



General. 



Physical prop- 

 erties. 



Chips or 



Xo. slag. 



Top course or 

 So. slag. 



Bottom course 

 or No. slag. 



Method of sam- 

 pling. 



Methods of 

 testing. 



The broken slag shall consist of angular fragments of 



(insert types allowable) s i a g, 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. 



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 (the largest size selected) inch screen. 100 



