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What Causes Deterioration In Asphalt And How You Can Fix It

By Author: jasper avila
Total Articles: 165

Asphalt pavement is regarded for it’s endurance and durability. It’s strengths make it a highly applied substance for many pavement applications and the most popular material for a good number of federal and state motoring developments. As with any paved surfaces however, it is going to be susceptible to deterioration on account of the laws of mother nature. Regardless of the outstanding durability associated with a properly laid asphalt roads, may possibly be cut short as a result of inadequate work surface preparation and construction technique or simply long term exposure to the elements.

Let’s take a closer look at what causes deterioration.

Deterioration of constructed asphalt pavement is natural. It’s natural because over time the materials that make up asphalt begin to break down and become affected by elements such as rain, sunlight and chemicals that come into contact with the pavement surface. The liquid asphalt binder that is the “glue” of the pavement begins to lose it’s natural resistance to water, allowing it to penetrate into and underneath the pavement. Once this happens, the surface can quickly fall prey to a number of different types of deterioration.

Deterioration of asphalt pavements can also be due to factors that go beyond just normal wear and tear causing premature deterioration. The premature degradation of asphalt pavement is usually due to failures in construction - or human error. This can be due to factors including:

• a base below the asphalt that is improperly compacted

• when the asphalt itself has not been properly compacted

• spreading asphalt in temperatures that are too hot or cold

• poor drainage

When asphalt pavement is properly constructed and maintained it can last a quarter century but to protect it you must maintain it much like a building.

Factors that cause deterioration in pavement include.

Water - over time and especially without proper maintenance water penetrates the asphalt, washes out the base underneath it, causing it to crack, break down and collapse.

Sunlight - Oxidation breaks down and dries out the once flexible liquid asphalt that holds the aggregate together. This causes raveling and shrinking cracks which allow liquids to penetrate beneath the surface.

Chemical / petroleum exposure - the introduction of chemicals to asphalt, including gas and oil, can soften the asphalt and cause it to break down more rapidly.

The truth is no asphalt is exempt from deterioration no matter how well it is constructed. Asphalt deterioration begins immediately. Even in normal conditions substantial deterioration can begin to take place after 3 to 5 years. It is normal after this amount of time for asphalt to begin to turn gray, become brittle and start cracking. Water begins entering the cracks, freezes and thaws during the yearly cycle and causes larger cracks and potholes. Rain enters the cracks and causes base damage. These all contribute to a worn out asphalt pavement and must be stopped before it’s too late.

Below is a list of the different types of asphalt deterioration caused by the preceding factors:

Cracking - There are many different types of cracking that can occur, and believe it or not they all have names. They include: alligatoring, edge cracks, slippage (caused by improper compaction), reflection (older cracks occurring in a new overlay), edge joint, shrinkage and widening.

Distortion - Caused by improper pavement construction, deterioration of the underlying base or existing asphalt and high load factors, asphalt distortions include: channels or ruts, corrugations and shoving, grade depressions, upheaval and utility cut depressions.

Disintegration - Types of asphalt disintegration includes potholes, raveling, gas and oil spillage.

Just as you paint a new house to protect it from the elements, asphalt must also be protected to maximize its lifespan. Sealing the pavement with a quality asphalt or coal tar based sealant is the best way to protect this valuable investment. In fact, it is recommended that new asphalt be sealed within 60 to 90 days of the application (after it has cured, hardened) to begin protecting it from the elements.

Just as surface preparation is critical to constructing a sound asphalt pavement, so to is surface preparation critical for a successful sealcoat job. In our next article we will discuss preparing the existing asphalt in preparation for sealcoating. After all, a good sealcoating job is 95% surface preparation.

Follow the link to find us parking lot sealcoat, we can help you get the job done quickly. - sureshotsealing.com

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