PENETRATION of Bitumin

Updated: Jul 16, 2020

PENETRATION

AIM

To determine the penetration of bitumen as per IS: 1203 - 1978.

PRINCIPLE

The penetration of a bituminous material is the distance in tenths

of a mm, that a standard needle would penetrate vertically, into a

sample of the material under standard conditions of temperature,

load and time.

APPARATUS



PENETROMETER

i) Penetrometer

ii) Water bath

iii) Bath thermometer - Range 0 to 44 °C, Graduation 0.2 °C

SAMPLE

Bitumen should be just sufficient to fill the container to a depth

of at least 15 mm in excess of the expected penetration.

PROCEDURE

i) Soften the bitumen above the softening point (between 75

and 100oC). Stir it thoroughly to remove air bubbles and

water.

ii) Pour it into a container to a depth of at least 15 mm in

excess of the expected penetration.

iii) Cool it at an atmospheric temperature of 15 to 30 °C for

1 h 30 min. Then place it in a transfer dish in the water bath at

25.0 + 0.1 °C for 1 h 30 min

iv) Keep the container on the stand of the penetration

apparatus.

v) Adjust the needle to make contact with the surface of the

sample.

vi) Adjust the dial reading to zero.

vii) With the help of the timer, release the needle for exactly

5 seconds.

viii) Record the dial reading.

ix) Repeat the above procedure thrice.

REPORTING OF RESULTS

The value of penetration reported should be the mean of not less

than three determinations expressed in tenths of a mm.

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