Tests on Emulsion

Coagulation of Emulsion at low temperature

Code: This test is done as per IS: 8887-2004

Procedure:

• i) Wash 600-rnicron IS Sieve with xylene, acetone and distilled water. Moisten the clean sieve with cetrimide.
• ii) . Pass some of the emulsions through the sieve and introduce 20 ml of sieved emulsion into the boiling tube. Bring the emulsion by plunging the tube into the water at 30°C and stir gently with the thermometer until temperature of the emulsion is constant.
• i) Remove thetube from warm water and plunge into the beaker containing iced water at the bottom of which crushed ice is retained by piece of wire gauge. During the cooling process stir slowly.
• iv) Lower the temperature of water by adding common salt, to -1 to -1.5°C so that the temperature of the emulsion is reduced to O°C. At O°C discontinue stirring and transfer the tube to another beaker with a freezing mixture at a temperature of -3 to - 4°C and allow the emulsion to remain quiescent for 30 min.
• iv) Remove the tube from the freezing mixture without disturbance and allow the temperature of the content to rise spontaneously to room temperature. Moisten the sieve with cetrimide and pass the emulsion through the sieve. Wash the tube free from emulsion and other residue with cetrimide and pass the washings through the sieve. The coagulated bitumen, if any, will be retained on the sieve.

Uses:

Used to determine Coagulation of Emulsions at Low Temperature of bitumen emulsion.