RECOMMENDED STANDARD FORMS OF SPECIFICATIONS FOR 



MATERIALS. 



SPECIFICATION FOR BROKEN STONE FOR WATERBOUND MACADAM. 



The broken stone shall consist of angular fragments of 

 (insert types allowable) f f uniform quality through- 



out, free from thin or elongated pieces, soft or disintegrated stone, 

 dirt, or other objectionable matter. 

 The stone shall meet the following requirements : 



Per cent of wear to 



(or French coefficient to ) 



*Toughness to 



*Hardness to 



*Absorption not more than % 



That portion of the product of the crusher, including the dust 

 of fracture, which, when tested by means of laboratory screens, 

 will meet the following requirements : 



Per cent. 



Passing -inch screen 100 



Total passing -inch screen to 



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 



Stone 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 stone shall be 

 made in accordance with the methods described or referred to on 

 pages of these specifications, tests Nos. 



General. 



Physical prop- 

 erties. 



Screenings or 

 No. stone. 



Top course or 

 Xo. stone. 



Bottom conrse 

 or No. stone. 



Method of sam- 

 pling,. 



Methods of 

 testing. 



SPECIFICATION FOR BROKEN STONE FOR BITUMINOUS MACADAM. 



The broken stone shall consist of angular fragments of General, 



i!?.?™*.*?.?.^ allowable ) ., of uniform quality throughout, free from 

 thin or elongated pieces, soft or disintegrated stone, dirt, or other 

 objectionable matter occurring either free or as a coating on the 

 stone. 



* Tests recommended by the conference which it may be desirable to 

 omit in some instances. 



