SAMPLING AND TESTING HIGHWAY MATERIALS. 
Table 3. — A. 8. T. J/, standard sieves. 
69 
Mesh desig- 
nation. 
Unit or measure. 
30. 
/Centimeter. 
\Ineh 
/Centimeter. 
Unch 
f Centimeter. 
(Inch 
/Centimeter. 
\Inch 
/Centimeter. 
\Inch 
/Centimeter. 
\Inch 
/Centimeter. 
\Inch 
j/Centimeter. 
,1lnch 
Actual 
mesh. 
6 
20. 3 
12 
30.5 
16 
40.6 
20 
50.8 
31 
78.7 
39 
99.1 
79 
200.7 
0.200 
■ 
.0197 
.036 
. 01 42 
. 01 1 4 
.017 
.0067 
.014 
.0055 
.002') 
Permissible varia- 
Wire 
tions. 
diameter. 
Mesh. 
Diameter. 
0.056 
±0.04 
±0.005 
±0.1 
±.002 
.040 
+ 0.2 
± . 0015 
. 0157 
±0.5 
±.0006 
.033 
±0.4 
±.0012 
.0130 
±1-0 
+ . 0005 
.026 
±0.6 
+ .0010 
.0102 
±1.5 
-.0004 
.021 
±0.8 
+ .0010 
.0083 
±2 
±.0004 
.015 
±1 
+ .0008 
.0059 
±3 
±.0003 
.0116 
+ 1 
±.0008 
.0046 
±3 
+ .0003 
.0053 
±3 
±.0005 
.0021 
±8 
±.0002 
Note— It 
ammended that the 10, 40, 80, and 200 mesh sieve be used. 
METHOD FOR DETERMINATION OF FINENESS OF 
MINERAL FILLER. 
1. The fineness test of mineral filler shall be made on a 200- 
inesh sieve which meets the requirements of the 200-raesh sieve 
specified for Portland cement. 
2. The test shall he made with 50 grams of filler. The sieve 
shall he thoroughly clean and dry. The filler shall be placed on 
the Xo. 200 sieve, with a pan and cover attached, if desired, and 
shall he held in one hand in a slightly inclined position so that 
the sample will he well distributed over the sieve, at the same 
time gently strikin.tr the side about 150 times per minute against 
the palm of the other hand on the upstroke. The sieve shall be 
turned every 25 strokes about one-sixth of a revolution in the 
same direction. The operation shall continue until not more than 
0.05 gram passes through in one minute of continuous sieving. 
The fineness shall be determined from the weight of the residue 
on the sieve expressed as a percentage of the weight of the 
original sample. 
3. Mechanical sieving devices may be used, but the filler shall 
not be rejected if it meets the fineness requirement when tested 
by the hand method described in section 2. 
TEST FOR WATER IN EMULSIONS. 
The percentage of water may he obtained by the method for de- 
termination of water in bituminous material, without the addition 
of naphtha or benzol, or by the calcium chloride method. 
Calcium Chloride Method for Determination of Pkk 
Cent Water in Bituminous Emulsions. 
Approximately 10 grams of the emulsion is accurately weighed 
in an Erlenmeyer flask and exactly 25 cubic centimeters of a 10 
per cent solution of caleuin chloride added and thoroughly agi- 
tated by shaking. The liquid content of the flask is then poured 
into a graduated cylinder. Carbon di sulphide is Mien added to 
the Erlenmeyer flask and the separated asphalt dissolved and 
washed with carbon disulphide into the graduated cylinder above 
referred to containing the decanted liquid. The total contents of 
