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1. Bitumen Tack Coat Calculation
The use of tack coat shall be at the rate defined in Table 500-5, and it shall be spread uniformly. If the rate of application of Tack Coat is not defined in the contract, then it shall be the rate defined in Table 500-5.
No dilution or heating at the site of RS1 bitumen emulsion shall be allowed. Paving bitumen if utilized for tack coat shall be warmed to the required temperature in bitumen boilers to attain a viscosity of less than 2 poise.
The standard degree of spraying temperature for a bituminous emulsion shall be 20ºC to 70ºC and for cutback, 50ºC to 80ºC.
The method of application of tack coat will rely on the type of equipment to be employed, the size of nozzles, pressure at the spray bar, and speed or ahead movement.
The contractor shall show at a spraying trial, that the equipment and method to be employed are qualified of making a uniform spray, within the forbearances defined.
| Type of Surface | Rate of Spray of Binder in Kg per sq. m |
| Bituminous surfaces | 0.20 – 0.30 |
| Granular surfaces treated with primer | 0.25 – 0.30 |
| Cement concrete pavement | 0.30 – 0.35 |
| Area for Bitumen = Length × Breadth |
| Total Quantity = Total Area × Rate of Spray |
This was for the Bitumen Tack Coat Calculation.
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