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.
- Bitumen pressure sprayer
The primer shall be a bitumen emulsion cationic slow setting (SS-1) as per IRC:16-2008 / IS 8887-2004 as per specifications given to the project work.
- The surface of Wet Mix Macadam (base) shall be prepared in accordance with 501.8 and 901 of MORT&H.
- 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.
- The surface shall be kept moist conditioned until the primer is applied.
- 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.
- The application (rate of spread) of bitumen primer shall be as per contract specification and clause 502 of MORT&H.
- Small areas, inaccessible to the distributor or in narrow strips shall be sprayed with a pressure hand sprayer or as directed by Engineer.
- The prime Coat surface shall be allowed to cure for at least 24 hours or as directed by the Engineer.
- The primed surface shall not be opened to traffic other than that necessary to lay the next course.
- 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.
- Protects the integrity of Granular Sub Base during construction.
- Helps reduces dust
- Ensures a good bonding between the seal and underlying surface.
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