Humboldt H-1050 Ductility Machine - Manual (Page 4)

Test Procedure
1. Fill the trough with water until the level reaches a point where it will cover
the test specimen by at least 2.5 cm both above and below.
2. Bring the water to the desired test temperature. During the test, the water
should be kept at the specified temperature within ±0.5 o C (0.9 o F).
3. To adjust the speed of carriage move knurled knob at the end of the sliding
gear all the way in for ¼ cm per minute, half way out for 1 cm per minute
and all the way out for 5 cm per minute. Be sure to locate positioning lever
in the proper slot-this will not only locate, but will also lock the gears in their
exact alignment.
4. Place the specimen in position by setting one end of the specimen mold
onto one of the three mounting pins on the end plate. Set the other end of
the mold onto the corresponding pin on the movable carriage.
5. Move the length indicator to the zero position by loosening the adjusting
screw.
6. Measure the distance in centimeters through which the clips have been
pulled to produce rupture.
7. At the completion of the test, return the carriage to the starting position.
Note: If the test material comes in contact with the surface of the water or the
bottom of the bottom of the bath, the test is not considered satisfactory. The
specific gravity of the bath may be adjusted by the addition of either methyl
alcohol or sodium chloride to prevent the bituminous from coming to the surface
of the water or touching the bottom of the bath during the test.
Test Report
The test is considered normal when the rupture occurs at the point where the
thread has practically no cross-sectional area.
The average of three normal tests is reported as the ductility of the sample.
Maintenance
All bearing surfaces should be kept clean. the oil cups provide for adding SAE
Grade 30 lubricating oil. Threaded lead screw should be kept clean and properly
greased to ensure proper carriage level travel. Use NGLI #2 Extreme Pressure
Lithium Grease or equivalent on the threads. When not in use, remove line cord
from the outlet to prevent misuse or improper handling.