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 
No. stone. 
Bottom course 
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 
5.!®! : ™*:..t??™..?.??. .Tf™™L' 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. 
General. 
* Tests recommended by tbe conference which it may be desirable to 
emit in some instances. 
