Mixed bitumen is a term used to refer to a mixture of bitumen and a suitable liquid (for example kerosene or gasoline). This bitumen in normal environment temperature is liquid or is changed to liquid with a little heat. Mixed bitumen is used in different kinds of macadam and coating asphalts. The speed of its clotting or hardening depends on the kind of liquid. For example, because of the high speed of gasoline evaporation, bitumen solved in gasoline hardens faster. This bitumen is called rapid clotting (RC) bitumen. The bitumen solved in kerosene is called mild clotting (MC) bitumen and those solved in gas oil or fuel oil is called slow clotting (SC). Liquid bitumen is classified according to their viscosity rate.