transportation lab experiment

1. VISCOSITY TEST
( IS:1206 – 1978 )
ARBIN RAJ
S1 Mtech
TRANSPORTATION ENGINEERING

2. INTRODUCTION
VISCOSITY
• Defines the fluid property of bituminous material
• Inverse of fluidity
• Degree of fluidity at application temperature is greatly influence the ability
of bituminous material to spread

3. AIM
Determine the viscosity of bitumen by tar viscometer
APPARATUS
• Tar viscometer with 4mm and 10mm orifices
• Thermostatically controlled water bath
• Stirrer
• Graduated cylinder
• Thermometer

4. TAR VISCOMETER

5. PROCEDURE
• Tar cup is cleaned and levelled
• Water bath is heated to specified temperature with continuous stirring
• Heat the sample at a temperature 200 c above specified test temperature
• Allow the material to cool with continuous stirring
• Wait for sometime to reach the material slightly above test temperature

6. • Material is poured in tar cup until the levelling peg on the valve rod just
immersed
• Pour 25 ml of mineral oil or 1% by weight solution of soft soap in the
graduated cylinder
• Place the cylinder under the orifice

7. • Maintain the sample material at a test temperature of + or – 0.10c for 5
minutes
• Open the orifice valve
• Start stopwatch when cylinder read 25ml
• Time is recorded for flow up to a mark of 75ml
• Repeat the procedure and take average time

8. RESULT
VISCOSITY : Time in seconds for 50 ml of the test sample to flow through the
orifice at given temperature

9. TYPE OF
MATERIAL
ORIFICE SIZE,
mm
TEST TEMP,
0 C
VISCOSITY RANGE,
sec
A35 & S35 10 mm 600 C 90 – 100
A45 & S45 10 mm 600 C 80 – 90
A55 & S55 10 mm 600 C 70 – 80
A65 & S65 10 mm 600 C 60 – 70
A90 & S90 10 mm 600 C 50 – 60
A200 & S200 10 mm 600 C 40 – 50
Cutback – RC, MC
& SC
Grade – 0
4 mm 250 C 25 – 75
Grade – 1 4 mm 250 C 50 – 150
Grade – 2 10 mm 250 C 10 – 20
Grade – 3 10 mm 250 C 25 – 75
Grade – 4 10 mm 400 C 14 – 45
Grade – 5 10 mm 400 C 60 – 140
VISCOSITY LIMIT FOR VARIOUS TYPES BITUMEN

10. THANK YOU……