Why isn't my asphalt smooth?

One of the reasons why you should use a professional asphalt contractor to lay your asphalt is because you can encounter a lot of issues if you attempt to lay asphalt yourself. One of the issues you may encounter is not having an asphalt surface that is smooth. If you have attempted to lay asphalt yourself and the surface is not smooth, here are a few of the reasons why you may have this issue.

Not Enough Asphalt to Bind the Aggregates

Hot asphalt is poured over an aggregate mix to form an asphalt surface, such as a road, driveway or walkway. When asphalt is hot, it has a thick consistency that is slightly runny. This allows it to get into all of the spaces between the aggregate mixture, creating a solid surface as the asphalt cools and hardens. But, if there is not enough asphalt poured over the aggregate mixture, you may wind up with a surface that is not. If your surface looks lumpy or uneven, this is the most likely cause. Fortunately, this can be relatively easily fixed. A new layer of aggregate and asphalt can be laid by a professional to help even out the surface and make it smooth.

Not Enough Compaction

Another reason why an asphalt surface may not be smooth is because there was not enough compaction. After hot asphalt is poured over an aggregate mixture, that new surface needs to be smoothed. This is done using either a roller or a tamper. Rolling the surface helps to push the hot asphalt down, so it binds to the aggregate mix, while also helping to push out air bubbles. This creates a smooth, level surface. If you notice the surface is not smooth and it looks like rocks or chunks of asphalt are being lifted away, this is the likely culprit. Unfortunately, fixing asphalt that is not properly compacted is not easy. In the worst cases, the entire asphalt surface needs to be removed and needs to be started fresh.

An Unsuitable Aggregate Mix

An unsuitable aggregate mix was used. You cannot use any aggregate mix and expect a smooth, level surface. You need to use one that features smooth, crushed rock combined with a mixture of smaller particulates. The exact aggregate mix that is needed will vary based on weather in your area, how much moisture your area gets and how you intend on using the asphalt surface. A professional knows what type of aggregate mix is ideal for your asphalt surface, whereas the average person has no idea what mix to use. There is no way to correct a surface that is not smooth due to the wrong aggregate mix.