Do runways of the airports have some special kind of tar or protective layer to avoid the wear and tear in comparison to that of the Highways as they need to handle the much high pressure and the weights than normal highways?
Airport designers may use any type of material, based on construction research status and local meteorological conditions. Pavements may be flexible or rigid. There is no single technique to protect against wear and tear, and none specific to airports, this is similar to regular road construction.
FAA provides advisories to help designers. ICAO requires airports to report their pavement characteristics.
(source: Detroit Free Press)
FAA documentation related to pavement design:
ICAO requires member states to report aerodrome-related aeronautical data, including pavement strength. The standardized method is known as the Pavement Classification Number (ACN-PCN) method.
As a critical characteristic of a pavement is the friction, this matter is refined in Measurement, Construction, and Maintenance of Skid-Resistant Airport Pavement Surfaces. This document includes data on rubber removal frequency, e.g.
Busy runway end:
(source: Bridgepoint Road Markings Ltd)
A technique for rubber removal:
(source: Waterblasting Technologies)
This thesis describes how to optimize runway pavements in order to increase friction and how to remove rubber deposit:
Optimizing Airport Runway Performance by Managing Pavement Infrastructure by Samantha Theresa Pinto. Note that:
Rubber accumulation on a dry runway is generally not a problem since the rubber interaction between the aircraft tire and the rubber on the runway creates traction that may actually improve friction. However, in wet conditions, rubber accumulation leads to loss of friction on the runway by clogging the pavement texture and creating an especially slick surface with minimal drainage capability when the runway surface is wet. Additionally, rubber accumulation causing decreased friction values means pilots have less directional control of the aircraft than expected on a bare and dry runway.
To withstand the heavy loads of heavy aircraft landing, the runway mainly needs sufficiently strong foundation and that can be done by simply making it sufficiently thick. Concrete is recommended for airport accepting very heavy aircraft like A380, but it's not always an option because concrete is very rigid and thus requires stable ground and some airport, like the new Hong Kong International Airport built partly on reclaimed land, don't have that luxury.
For surface wear, note that while a runway experiences heavier and faster movements, there is much fewer of them than on a busy motorway.