Twin-layer asphalt paving, also referred to as two-layer asphalt paving, is one of the most recent developments in road resurfacing. Paving contractors worldwide are exploring this method and perfecting techniques to take full advantage of this process. What is this road resurfacing method? Here’s what you need to know.
What is twin-layer asphalt paving?
This method involves laying the binder course and the wearing course simultaneously. The process varies between paving contractors. A handful of contractors are currently developing varied approaches to how this is accomplished.
What are the benefits of twin-layer asphalt paving?
One of the top benefits of this road resurfacing method is the bond it creates. When a paving contractor lays the wearing course on top of the hot binder course, this creates a strong bond between the two layers. With this interlocking bond in place, the surface is stronger and will deliver a longer lifespan.
Another major benefit is cost savings. When a paving contractor uses twin-layer asphalt paving, it is possible to apply a thin layer of wearing course. Wearing course is expensive, so the reduction in the amount of material required can cut costs significantly. This method also eliminates the need to add an emulsion layer on top of the binder course. Removing this step also reduces the overall cost of the project.
What equipment is required for twin-layer asphalt paving?
The equipment used for twin-layer asphalt paving varies. A paving contractor may use a single paver or two pavers. When one paver is used, it must be fitted with two screeds and two hoppers. If two pavers are used, they follow each other to perform the two duties. With either method, standard pavers can be used, but they are fitted with special equipment to complete the twin-layer asphalt paving.
The Japanese company Sumitomo has developed a multi-asphalt paver (MAP) that has two sets of screeds and hoppers, enabling the machinery to pave two layers simultaneously. These layers can be upper and lower layers or parallel lanes. The simultaneous upper and lower layer method is referred to as the DAP method. If two lanes are completed at once with two different mixtures, this is referred to as the MLP method.
Who is qualified to complete twin-layer asphalt paving?
Three companies are leading the initiatives for twin-layer asphalt paving in Europe and Asia. Sumitomo in Japan and Dynapa and Vögele in Europe have made headway with developing this method. However, these companies are still looking into using their systems overseas.
For a paving contractor who can provide more information about twin-paver asphalt paving in your area, contact the team at Paveco Inc.
Want to learn more about this method of road resurfacing? With over 60 years of experience in the design and construction of commercial and residential asphalt surfaces, Paveco Inc. is your go-to paving contractor for expert input. Contact us today with any questions or to get started on your next project. No job is too big or small. Reach our experienced team at 703-594-3773.
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