Asphalt Pavement Defects To Know Part 2

Defects found on the surface of a Lakeland parking lot paving may mean deeper problems that we originally thought. Cracks are not just cracks and potholes are not merely potholes. There are so much more about these issues that we cannot see. The surface beneath the asphalt overlay should be assessed and maintained regularly if we want to make sure of a healthy asphalt pavement.

Here are some more problems that we should be aware of about asphalt pavement:

Joint Reflection Cracks

These cracks refer to those found on flexible pavement overlay of a rigid pavement (asphalt over concrete, for example). These appear directly over the underlying rigid pavement joints. Crack sealing can prevent further damage to the pavement, but severe cracks require the services of a professional asphalt pavement company.

Slippage Cracks

If you ever see a crescent-shaped crack or tears on the surface of the pavement, those are called slippage cracks. This means the new material, often an asphalt overlay, has slipped over the underlying course because of a lack of bonding material between the layers. Tack coat must be used to develop a bond between asphalt layers, but this does not always happen. You must also use prime coat to bond the asphalt layers below to the stone base course. The lack of bond can also result from the presence of dirt, oil or other contaminants.

Potholes

These are bowl-shaped depressions, whether small or large, that appear on the surface of the pavement and go all through the layers, down to the base course. Generally, these potholes have sharp edges and vertical sides near the top of the hole. These holes are mostly the result of moisture infiltration. Alligator cracks can also end up as potholes. To repair a pothole, a full depth replacement must be made.

Depressions

Depressions are defined as localized pavement surface areas that have lower elevations compared to the surrounding environment. These are mostly noticeable post-rain since they are being filled with water. Less severe depressions can be fixed by applying a thin surface patch or infrared patch.

Rutting

These are channelized depressions in the wheel tracks. Rutting is usually caused by the lateral movement of the pavement layers or the subgrade under traffic. When constructing the pavements, you need to make sure of the pavement thickness, the compaction of the base layer, the asphalt mixes, and protection from moisture infiltration. If the rutting is minor, it can be filled and overlaid. If it is severe, the area should be removed and replaced.

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