Different forms of Bitumen 

The forms of bitumen are as follows:-

1. Cutback bitumen 
2. Bitumen Emulsion 
3. Cutback  Bitumen 
4. Bituminous  primers 
5. Modified Bitumen 

1. Cutback bitumen 

         Normal practice is to heat  bitumen to reduce its viscosity. In some situations preference is given to use liquid binders such as Cutback bitumen.  In Cutback bitumen suitable solvent is used to lower the viscosity of the bitumen. Cutback bitumen is used for cold weather bituminous  road construction and maintenance. 

2.Bitumen Emulsion 

         Bitumen emulsion is a  liquid product in which in which a substantial amount of bitumen is suspended in a finely divided condition in an aqueous medium and stabilized suitable material The Bitumen emulsion may be of anionic type or cationic type. Three types of bitumen emulsion  are available Rapid setting (RS), Medium setting (MS), and Slow setting (SS).

3.Cutback Bitumen 

       Cutback bitumen is obtained by blending bitumen blinder with suitable diluent or solvents in the required proportion to reduce its  viscosity tobthe desired range. Cutback is available in three types,  Rapid curing (RC), medium curing (MC), slow curing (SC).

4. Bituminous primers 

      In Bituminous primers the distillate is absorbed by the road surface in which it is  spread. The absorption there for depends on the porosity of the surface.