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Home| Questions|Q 72265
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Answered
Oliva Jones
Oliva Jones
Asked: June 21, 20222022-06-21T23:16:42+05:30 2022-06-21T23:16:42+05:30In: Highway Engineering

Describe the function of prime coat, tack coat and seal coat in bituminous construction

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      Vipin Chauhan Professional
      2022-06-22T00:38:28+05:30Added an answer on June 22, 2022 at 12:38 am

      Prime Coat

      The objectives of the priming the granular surface are to

      1. Penetrate deep into the surface and plug or seal the voids on the surface
      2. Coat and bond the loose particles on the surface.
      3. Render the surface of the base course water-resistant and
      4. Permit the tack coat to be applied over the primed surface to provide proper adhesion between the base and the bituminous pavement layer constructed above the treated granular base.

      Tack Coat

      To provide an adequate interface bond between the receiving pavement surface and the new bituminous layer being overlaid. The binder of the tack is not expected to penetrate into the pavement surface and plug the voids.

      Seal Coat

      To prevent the entry of water into open graded premix carpet seal coat is laid.

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