SAMPLING AXD TESTING HIGHWAY MATERIALS. 
61 
TEST FOR DUCTILITY OF BITUMINOUS MATERIALS. 
(A. S. T. M. tentative method, serial designation D 113-21 T., slightly 
modified.) 
1. The ductility of an asphalt cement or semisolid bitumen is 
the distance to which it will elongate hefore breaking when two 
ends of a briquet of the material are pulled apart at a specified 
speed and at a specified temperature. When the conditions of 
the test are not specifically mentioned, the rate and the tempera- 
ture are understood to be 5 centimeters per minute at 25° C. 
(77° F.). 
APPARATUS. 
2. The mold shall be as shown in Figure 5. It shall be made 
of brass, the ends, B and B' , being known as clips, and the parts 
A and A', as sides of the mold. The dimensions of the mold shall 
be as follows : 
Total length (internal) : 7.45 to 7.55 centimeters. 
Distance between clips : 2.97 to 3.06 centimeters. 
Width of clips at mouth: 1.98 to 2.02 centimeters. 
Width of briquet at minimum cross section (halfway be- 
tween clips) : 0.99 to 1.01 centimeters. 
Thickness of briquet throughout : 0.99 to 1.01 centimeters. 
Mold. 
Fig. 5. — Ductility mold. 
3. The water bath shall be maintained at a temperature not Water bath. 
varying more than 0.1° C. from 25° C. (77° F.). The volume of 
water shall be not less than 10 liters and the sample shall be im- 
mersed to a depth of not less than 10 centimeters and shall be 
supported on a perforated shelf not less than 5 centimeters from 
the bottom of the bath. 
4. Any apparatus may be used for pulling the briquet of bitu- Ductility 
men apart that is so constructed that the briquet will be con- apparatus. 
tinuously immersed in water and the two clips pulled apart at 
a uniform speed of 5 centimeters per minute. 
PROCEDURE. 
5. The asphalt cement or bituminous material to be tested shall Method of test. 
be completely melted at such a temperature that it will be 
thoroughly fluid — with ordinary paving asphalt cement this is 
about 160° C. (320° F.). It shall then be strained through a 50- 
mesh sieve and, after a thorough stirring, poured into the mold. 
The mold shall be assembled on a brass plate and. so .-is to pre- 
vent the material under test from sticking, the surface of the 
plate and the interior surfaces of the side pieces A A' of the mold 
shall be thoroughly amalgamated. In ri 11 i n u the mold, care shall 
be taken not to disarrange the parts and thus distort the briquet. 
