Construction Methodology of Prime Coat

Prime Coat shall consist of the application of a single coat of low viscosity liquid bituminous material to a porous granular surface in accordance with clause 502 of MORT&H specification.

MACHINERY
  1. Bitumen pressure sprayer
  2. Balance
  3. Plates
MATERIAL

The primer shall be a bitumen emulsion cationic slow setting (SS-1) as per IRC:16-2008 / IS 8887-2004 as specified in the technical specification.

Prime Coat

Fig. 01 – Prime Coat

METHODOLOGY
  1. The surface of Wet Mix Macadam (base) shall be prepared in accordance with 501.8 and 901 of MORT&H.
  2. Immediately prior to applying the primer, the surface shall be carefully swept clean of dust and loose particles, care being taken not to disturb the interlocked aggregate.
  3. The surface shall be kept moist conditioned until the primer is applied.
  4. Trials shall be carried out to know the application of priming at different speeds of the sprayer and the speed shall be fixed for the rate of the required application.
  5. The application (rate of spread) of bitumen primer shall be as per contract specification and clause 502 of MORT&H.
  6. Small areas, inaccessible to the distributor or in narrow strips shall be sprayed with a pressure hand sprayer or as directed by Engineer.
  7. The prime Coat surface shall be allowed to cure for at least 24 hours or as directed by the Engineer.
  8. The primed surface shall not be opened to traffic other than that necessary to lay the next course.
ENVIRONMENTAL CONTROL

Has to take proper care to prevent spilling of material from the trucks during transportation. Workers are required to use protective gears like a special boot, hand gloves etc.

USES
  1. Protects the integrity of Granular Sub Base during construction.
  2. Helps reduces dust
  3. Ensures a good bonding between the seal and underlying surface.

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