This work shall consist of supplying and applying bituminous material to a previously prepared surface in preparation for the laying of bituminous courses. Prime coat shall be used where the surface to be coated is a non-bituminous e.g. aggregate Base Course Type I.
The prime coat shall be cut back asphalt of medium curing type MC30 or MC70 grade, conforming to the requirements of AASHTO M82. This may be prepared by cutting back 80/100 penetration grade bitumen with kerosene or any other approved cutter in the ratio of 100 parts by volume of bitumen to 40 to 60 parts by volume of cutter.
Preparation: Before spraying is commenced, the surface shall be free of all loose materials. The surface as a whole shall be generally clean, free of contamination and free of standing water
Weather Limitations:
Prime coat shall be applied only on the following conditions:
a) Surface is dry or slightly damp; and
b) Weather is not foggy or rainy.
Spreading Rate:
The rate of application of prime coat will be dependent on the texture of the aggregate surface and the quantity sprayed should be such that the surface is dry within 48 hours leaving no free pools of bitumen on the surface. The prime coat application rate shall normally be in the range 1.0 to 2.5 litres/sq.m (residual bitumen). The depth of penetration shall be 3 mm or more.
Curing:
Surfaces primed with asphalt for at least 24 hours before covering with the next course.
Maintenance:
The primed surface shall be maintained by keeping it free of corrugations, potholing, and loose material until the next course is placed. Remove dirt or other deleterious material and repair damaged areas.
Spread additional blotter to cover unabsorbed asphalt. Remove excess blotter after the asphalt is absorbed.
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