Reference Code : IS:8887-2004
To test the Bitumen Emulsion for coagulation at low temperature to ensure the homogeneity and stability, if exposed or stored at sub-zero temperature.
a) Boiling tube
b) Water bath
d) Glass rod
e) 600-micron IS sieve
f) Beakers -Two, 600 ml capacity
1. Sieve bitumen emulsion through 600-micron IS sieve
2. 20 ml of previously sieved homogenous bitumen emulsion is transferred in to a boiling tube
3. The temperature of this boiling tube is brought to 30°C by plunging the tube into water bath previously set at 30°C with gentle stirring by a glass rod.
4. Once the temperature of bitumen emulsion is constant at 30°C, the tube is plunged into ice bath or refrigerator previously set to 0°C with slow stirring by rod.
5. Once the temperature of emulsion reaches 0°C, discontinue stirring and the tube is transferred into another beaker with a freezing mixture at a temperature of -3 to -4°C for 30 minutes.
6. Finally, the tube is removed from refrigerator and brought to room temperature without any disturbance
7. The emulsion is filtered through 600 micron IS sieve and sieve is washed with distilled water and checked for residual bitumen coagulation.
FINDING FROM TEST
The emulsion has passed the test, if there is no coagulation.
As per IS 8887:2004, coagulation at Low Temperature should be NIL