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COPY.
(To accompany closure 1.)
Specification No. 7.
54
Construction of an Asphaltic Concrete Surface 14 inches thick.
MATERIALS.
1. The Hineral aggregate shall consist of finely crushed stone and filler, so proportioned that the mixture shall conform to the following
grading:-
Passing screen
of mesh.
100
200
92898888
Retained by screen
of mesh.
100%
between 8% and
11
8.5.
11.5
·
16.5.
22.5
10
4
7
20
•
12
17
30
#
6
40
#
2.5.
5.5
50
3
10
6
80
•
100
2.5 * 1.5 #
6.5
2.5
200
1 3 12
6
18
The stone shall not show a loss greater than 4% by weight when
subjected to the standard Deval Abrasion Test; and shall not show a
fracture under 25 blows when subjected to the Standard Impact Test.
2. The filler shall be pulverised limestone or Portland cement. All
of the filler shall pass a 50 mesh to the inch screen and at least 65%
shall pass a 200 mesh to the inch screen.
3. The cementing material shall be an asphaltun manufactured from an
asphaltic base crude oil and shall meet the following test:-
(a). The asphaltum shall have a penetration of from 26 to 75°
which shall be varied within those limits to adapt it to the
particular climatic, traffic, or other conditions to which it
is to be subjected.
(b). The asphaltum shall have a ductility of at least 100
centimeters when a briquette of 1 square centimeter cross
section is elongated at the rate of 1 centimeter per minute at a temperature of 25° C.
(c). When 20 grams of the asphaltum are heated for 5 hours at a
temperature of 163° C. in an oven, there must not be volatiliz
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