All information about the prime coat over a granular base

Prime coat over a granular base-

Scope: This work shall consist of the application of a single coat of low viscosity liquid bituminous material to a porous granular surface preparatory to the superimposition of bituminous treatment or mix.

Purpose of prime coat over Base course
1- To bond loose material of base course
2- To provide good adhesion between bituminous layer and granular layer
3- To plug the capillary tubes

Material: The primer shall be cationic bitumen emulsion SS 1(slow settling-1) grade conforming to IS: 8887 or medium curing cutback bitumen conforming to IS: 217 or as specified in the contract.

Quantity of SS1 grade bitumen Emulsion for various types of Granular surface.

Cutback for primer shall not be prepared at the site. Type and quantity of the cutback bitumen for various types of granular surface shall be given in table.

The correct quantity of primer shall be decided by the Engineer and shall be such that it can be absorbed by the surface without causing run-off of excessive primer and to achieve desired penetration of about 8-10 mm.

Weather and seasonal limitations: primer shall not be applied during a dust storm or when the weather is foggy, rainy or windy or when the temperature in the shade is less than 10°C.Cutback bitumen as primer shall not be applied to a wet surface. Surface which is to receive emulsion primer should be damp, but no free or standing water shall be present. Surface can be just wet by light sprinkling of water.

Measurement for payment: Prime coat shall be measured in terms of surface area of application in square metres.

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Gyan of engineering (Mukesh kumar)

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