Prime Coat, Tack Coat And Seal Coat

 Prime Coat :

Prime Coat is a application of Low viscosity bitumen over a granular base or base course to preparing it  for laying an  asphalt mixture.

Prime Coat

Purpose : The purpose of the prime coat is to coat and bond loose material on the surface of the base course to harden or toughen.

1. The base surface to provided a work platform for construction  equipment. To plug capillary voids in the base course surface prevent migration of moisture.

2. Prime coat also serves the purpose  to blocking capillary action in base course, so than water may  not arise up to the asphalt layers.

3. Prime coat apply before the 24 Hours then the base course surface behave like asphalt base course.

Tack Coat :

Layers between asphalt base course or asphalt wearing course is called Tack coat.

Tack Coat

Purpose : It behave like bonding coat between W.M.M or Asphalt layers.

2. To form a bond between asphalt base course and asphalt  wearing course.

3. If Tack coat is not applied, asphalt base course will tends to slip under traffic load, and pavement will fail due to slipping.

Tack Coat is also known as (Bitumen Bond)

Seal Coat : It is placed top of the pavements.

Seal Coat

Purpose : Seal coat increase the life span of  pavement.

2. To provide friction to the vehicles which is moving on the  road.

3. To providing waterproofing layers after applying the seal coat water is not penetrate in the other layers. It behave like impermeable layers.