FORMS FOR SPECIFICATION'S, ETC., FOR ROAD MATERIALS. 
19 
General. 
Grading. 
SPECIFICATION FOR SAND FOR SHEET ASPHALT. 
The sand shall be composed of sound, durable particles, free 
from a coating of clay or loam. 
When tested by means of laboratory sieves, it 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 
The 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 accordance 
with the method described or referred to on page of these 
specifications, test No. 
Note. — It is recommended that volumetric analyses be reported 
by the laboratory to facilitate field control. 
SPECIFICATION FOR SAND FOR FINE AGGREGATE FOR PORTLAND-CEMENT 
CONCRETE BASE. 
Methods of 
sampl i n g and 
grading. 
The sand shall consist of clean, hard, durable, uncoated par- 
ticles, preferably siliceous, free from lumps of clay and all organic 
matter. 
It shall be well graded from coarse to fine and, when tested by 
means of laboratory screens and sieves, shall meet the follow- 
ing requirements: Percent. 
Passing 1/4-inch screen 100 
Passing 20-mesh and retained on 50-mesh 
sieve to 
♦Passing 50-mesh sieve not more than 
Not more than per cent by weight shall be removed 
by the elutriation test. 
When the sand is mixed with Portland cement in the proportion 
of 1 part of cement to 3 parts of sand, by weight, according to 
standard methods of making 1 : 3 mortar briquets, the resulting 
mortar at the age of 7 and 28 days shall have a tensile strength 
of at least t per cent of that developed in the same time 
by mortar of the same proportions and consistency, made of the 
same cement and Ottawa sand. 
Preliminary acceptance samples shall be subjected to both 
7 and 28-day tests, and acceptance based thereupon. Samples 
tested during the progress of the work will be accepted on the 
basis of the 7-day test. 
General. 
Grading. 
Mortar 
strength test. 
* It is recommended that the amount passing the 50-mesh sieve be 
limited to 30 per cent, or less, if practicable. 
f It is recommended that the minimum strength ratio for this purpose 
be 70 per cent, or greater, if possible under existing conditions ; and 
that where sands giving a 70 per cent strength ratio are not available 
the proportion of cement be increased so as to give that percentage. 
