FORMS FOR SPECIFICATIONS, ETC., FOR ROAD MATERIALS. 
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 on pages 
of these specifications, tests Nos. 
Method of sam- 
pling. 
Methods of 
testing. 
Broken Stone ob Sand for Fine Aggregate. 
The fine aggregate shall be composed of sound, durable parti- 
cles of stone or sand. The particles shall be free from a coating 
of clay or loam. 
The broken stone or sand for fine aggregate, when tested by 
means of laboratory sieves, shall meet the following requirements : 
Per cent. 
Passing 10-mesh sieve not less than 
Passing 10-mesh and retained on 40-mesh 
sieve to — 
Passing 40-mesh and retained on 80-mesh 
sieve to 
Passing 80-mesh and retained on 200 mesh 
sieve to 
Passing 200-mesh sieve to 
Stone or sand shall be sampled for grading in accordance with 
the method described on page , paragraphs , of 
these specifications, and tests of grading shall be made in accord- 
ance with the method described or referred to on page of 
these specifications, test No. 
General. 
Grading. 
Methods of 
sampl i n g and 
grading. 
SPECIFICATION FOR BROKEN STONE OR GRAVEL FOR COARSE AGGREGATE FOR 
PORTLAND-CEMENT CONCRETE BASE. 
The broken stone or gravel aggregate shall consist of clean, General. 
hard, tough, durable rock. It shall contain no vegetable or other 
deleterious matter, and shall be free from soft, thin, elongated 
or laminated pieces. 
The broken stone or gravel shall be graded from coarse to fine, Grading. 
and when teseted by means of laboratory screens shall meet the 
following requirements : 
Per cent. 
Passing inch screen 100 
Passing inch screen not more than 
Broken stone or gravel shall be sampled for grading in accord- Methods of 
ance with the method described on page , paragraphs , grading? 5 
of these specifications, and tests of grading shall be made in 
accordance with the method described or referred to on page 
of these specifications, test No. 
SPECIFICATION FOR BROKEN STONE FOR COARSE AGGREGATE FOR PORTLAND- 
CEMENT CONCRETE WEARING SURFACE. 
The broken stone aggregate shall consist of fragments of clean, 
hard, tough, durable rock. It shall contain no vegetable or other 
deleterious matter, and shall be free from soft, thin, elongated, 
or laminated pieces. 
-17— Bull. 555 2 
General. 
