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Sealcoating is one of the most important elements of a pavement management plan. Air,sunlight, and moisture are a major cause of surface deterioration. Progressive weakening, erosion, oxidation, and unravelling due to water and weather damage can reduce pavement thickness by as much as 50%! If not kept in check, costly repairs or resurfacing may be necessary.

A Closer Look at Seal Coating

Asphalt is a very complex mixture of chemicals with very little saturation in their molecular structure.

The structure is considered “open chain” or “asphaltic” which provides easy access to weather, salts, and chemicals which in turn disintegrate the asphalt itself. This will result in loss of its original properties such as binding and waterproofing. Typically, the first visual sign of this loss is the “graying” of the asphalt from its original rich black look.

Asphalt is derived from the petroleum distillation process and when additional byproducts meet, such as oils, fats, grease, mineral spirits, etc. they have a natural affinity to join together. So when automotive oil or gasoline, both petroleum distillates, leak onto the pavement, they work to easily dissolve the similar chemicals in asphalt. These problems are associated primarily with off-street areas, such as, parking lots, minor roads, airport aprons or runways, service stations and driveways.

These all have low levels of traffic flow. Highways and major streets have the advantage of continuous rolling traffic which creates a kneaded oxidation
effect back into the pavement, therefore, creating a longer visual and strength advantage. Eventually all asphalt life is exhausted and the aggregate begin to unravel, evolving into minor cracks which widen and deepen with time. If water seeps into the cracks it allows the load capacity to falter. This then results into rutting, shifting, and serious alligatoring of the pavement.

Off-street pavements do not have the advantage of the kneading action. The surface layers of off-road pavements are under continuous attack from the weather and other destructive elements, eventually developing minor surface cracks. It is logical to conclude that off-street pavements can be preserved by a protective sealcoating that resists the attack of elements that destroy the asphalt anyway.

They act as a tough barrier for asphalt surfaces. The asphalt emulsions do not provide the resistance to color fading, salts, and petrochemicals such as, oils, fats, grease, and solvents such as the refined coal tar.

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Sealcoating Benefits:

  • Beautification When covered with a dark black sealant, pavement looks and wears like new. Parking lot sealcoating helps to project a positive image of the company, facility, or complex.
  • Slows oxidation and water penetration

    Sealcoating fills surface voids, which reduces exposure to oxygen and UV rays and reduces the depth to which oil or gas can penetrate the pavement. Sealcoating acts as a waterproofing agent, minimizing the rate at which water enters pavement. Without it, water can permeate more freely resulting in freeze/thaw expansion and contraction of the pavement.

  • Sealcoating resists oil and gas spills

    Gasoline dripping from a topped-off fuel tank during hot weather can soften and break down unsealed asphalt pavements. Coal tars used in sealcoat are impervious to gas and oil spills.

  • Asphalt sealcoating is easier to clean and maintain

    Sealcoats fill surface voids while coating the pavement surface. The resulting smooth and even texture makes the surface easier to maintain year-round. For example, snow is easier to remove from a smooth surface, and sweeping is far more effective on a smooth surface.

  • Sealcoating increases pavement flexibility

    Sealcoat brings a dark black color to the pavement. The blacker it is, the more heat a pavement draws from the sun. And, the hotter it gets, the more pliable it becomes, which helps it to withstand traffic without cracking.

  • Protects asphalt from pressure washing

    Restaurant parking lots often extend to areas near dumpsters, where food-processing machines are pressure washed. Food waste near the dumpsters may also need to be washed away if it can’t be swept away. Sealcoating protects asphalt cement from the high-volume water pressure and detergents used in pressure washing.

  • Asphalt sealcoating is cost effective

    The price of asphalt will always be affected by crude oil prices, which fluctuate when supplies vary. Sealcoating preserves asphalt for pennies per square foot.

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