In this post, I am going to teach you how to do penetration test of bitumen as per IS: 1203 – 1978.
The penetration of a bituminous material is the distance in tenths of an mm, that a standard needle would penetrate vertically, into a sample of the material under standard conditions of temperature load and time.
Which are the apparatus required for penetration test of bitumen?
- Water bath
- Bath thermometer – Range 0 to 44oC, Graduation 0.2oC
Sample used for bitumen test
Bitumen should be just sufficient to fill the container to a depth of at least 15mm in excess of the expected penetration.
Procedure for penetration test of bitumen
- The bitumen above the softening point (between 75 and 100oC) is softened. It is stirred thoroughly to remove air bubbles and water.
- It is poured into a container to a depth of at least 15mm in excess of the expected penetration.
- It is cooled at an atmospheric temperature of 15 to 30oC for 2 1 hrs. Then it is placed in a transfer dish in the water bath at 25.0 + 0.1oC for 2 1
- The container is kept on the stand of the penetration apparatus.
- The needle is adjusted to make contact with the surface of the sample.
- The dial reading is adjusted to zero. Is adjusted.
- With the help of the timer, the needle is released for exactly 5 seconds.
- The dial reading is recorded.
- The above procedure is repeated for thrice and the medium of there experiment will give us the penetration value of this bitumen test