Select the correct option from the following statements related pavement materials.
Statement A: A prime coat is an initial application of low viscosity bituminous material to an
absorbent surface like granular base.
Statement B: Tack coat is provided for bonding the new bituminous layer to an old one.
Statement A is Correct: A prime coat uses low-viscosity liquid bitumen applied directly to an
absorbent, untreated granular base (like a gravel or crushed stone base course). Its purpose
is to penetrate the surface, plug capillary voids, bond loose particles, and prepare it for the
next layer.
Statement B is Correct: A tack coat is a very thin, sticky application of liquid bitumen applied
to an existing paved surface (either old asphalt or concrete). Its sole purpose is to create a
strong adhesive bond between the old pavement layer and the new overlying bituminous
layer to prevent slippage.
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