FORMS FOE SPECIFICATIONS, ETC., FOR ROAD MATERIALS. 
Per cent. 
Passing (t?. e J_a^5J : .^?.l e i^ t . e _ d) ...inch screen 100 
Passing j(J^§_^se_st_8i%e__s^ected) inch screen 
and retained on (the second largest size se- 
A^ted)_inch screen to „ 
Passing (the second largest size selected) inch 
screen and retained on (the third largest 
S -™i e }l c }*^.L in ch screen _"J™JI"JI 
Passing (the third largest size selected) inch 
screen and retained on A^?A®^!^J™??fL* 
^^iffJ^Linch screen 
♦Passing, etc 
Stone shall be sampled for quality and grading in accordance 
with the method described on page , paragraphs , of 
these specifications. 
Tests of the physical properties and grading of the stone shall 
be made in accordance with the methods described or referred 
to on pages of these specifications, tests Nos. 
to 
Method of sam- 
pling. 
Methods of 
testing. 
SPECIFICATION FOR COARSE AND FINE AGGREGATE FOR LARGE AGGREGATE 
BITUMINOUS CONCRETE (BROKEN STONE OR SAND). 
Beoken Stone foe Coakse Aggeegate. 
The broken stone for coarse aggregate shall consist of angular 
fragments of .^.^.^L^P 6 . 8 ..^ 1 !^. 3 . 5 . 1 ^... » free from tnin 
or elongated pieces, soft or disintegrated stone, dirt, or other ob- 
jectionable matter occurring either free or as a coating on the 
stone. 
The stone shall meet the following requirements: 
Per cent of wear not more than 
(or French coefficient not less than ) 
t Hardness not less than 
f Toughness not less than 
f Absorption not more than ._% 
The broken stone for coarse aggregate, when tested by means 
of laboratory screens, shall meet the following requirements: 
Per cent. 
Passing ( the largest size selected ) -inch screen 100 
Passing (J*e largest jize selected) -inch screen 
and retained on .____< tMseqond largest size 
^l^.^L -inch screen to 
^Passing, etc 
Stone shall be sampled for quality and grading in accordance 
with the method described on page , paragraphs , 
of these specifications. 
General. 
Physical prop- 
erties. 
Grading. 
Method of sam- 
pling. 
* The number and size of screens and sieves may be continued as de- 
sired by the engineer. For 10-mesh sieve and finer the wording sbould 
be : Passing _ mesb sieve and retained on mesh sieve 
to The last requirement should be : Passing inch screen 
(or mesh sieve) not more than (or not less than) 
t Tests recommended by the conference which it may be desirable to 
omit in some instances. 
% The number and sizes of screens may be continued as desired by 
the engineer. The last requirement should be : Passing 1/4-inch screen, 
not more than 
