When the bitumen emulsion is applied on the
aggregate for the road works the water evaporates leaving behind the bitumen
droplets. These droplets spread on the aggregate and bind with each other and
gains strength eventually. Based upon the time taken by the emulsion to evaporate the water, bitumen emulsion is classified into 3 types based on setting time.
In slow setting emulsion, a special type of
emulsifier is used to slow the process of water evaporation.