Which of the following is used in a regular pavement maintenance activity?

Explanation:

Fog seal:

(i) Fog seal is used to repair the defects.

(ii) It is a spray of slow setting emulsion diluted with equal amount of water at a rate 0.5 - 1 lit/m².

(iii) Traffic is allowed after the seal sets in

(iv) It is used to increase the binder content of bituminous surface.

(v) It can also be used as an emergency treatment measure for hungry surface. 

Additional Information

Prime coat:  

(i) Bituminous prime coat is the first application of a low viscosity liquid bituminous material over an existing porous or absorbent pavements surface like the WBM coarse.

(ii) The main objective of priming is to plug in the capillary voids of the porous surface and to bond the loose mineral particles on the existing surface using a binder of low viscosity which can penetrate into the voids.

Tack coat:

(i) Bituminous tack coat is the application of bituminous material over an existing pavement which is relatively impervious like an existing bituminous surface or cement concrete pavement or a pervious surface like the WBM which has already been treated by a prime coat.