Asphalt Binder Layer

The binder which is sometimes called the base coat is a load bearing course consisting of aggregate and hot mix asphalt.

Asphalt binder layer.

When 16 to 25 rap is used. In general the asphalt layers are paved on a bound or unbound road base layer. This is where the binder and topcoat come in. For example if the specified binder grade for the virgin mix is a pg 64 22 the required grade for the recycled mix would be a pg 58 28.

What is the difference between binder and top coat. An asphalt pavement consists of different asphalt layers. The first binder layer of 1 5 would be a thicker stone. The selected binder grade for the new asphalt is one grade lower for both the high and low temperature stiffness than the binder grade required for a virgin asphalt.

For heavy duty traffic like trucks loading docks or roadways we recommend a 2 binder layer. Install new asphalt surface. Surface asphalt is made up of small aggregate sand and oil. Binder or base coat is known as the load bearing coarse and typically contains 3 4 stone.

Speight phd dsc in asphalt materials science and technology 2016. Crushed stone gravel sand and liquid asphalt. 8 cm this is the second layer of the whole asphalt paving which is present just below the upper asphalt sheet. The second layer is mostly called the binder course.

What is hot mix asphalt. Also known as blacktop asphalt pavement or hot mix pavement. Thick surface you can use the coarse asphalt mix for a 2 in. Once the supportive structures of a new asphalt surface are installed the top layer of fresh asphalt is added to provide a clean smooth ride.

Because the binder must be strong it typically contains aggregates that are approximately 0 75 inch in size. What is the binder. Starting at the road surface the first layer is called the surface course. The asphalt binder sometimes referred to as the asphalt cement binder or the asphalt cement is an essential component of asphalt concrete it is as the name implies the cement that holds the aggregate together the asphalt binder is a co product of the petroleum refining system that produces.

The binder layer can be thought of as the strength of any new asphalt surface. As the name suggests it acts as a binder between the uppermost and the lower surfaces. For example if the specified binder grade for the virgin mix is a pg 64 22 the required grade for the recycled mix would be a pg 58 28. The selected binder grade for the new asphalt is one grade lower for both the high and low temperature stiffness than the binder grade required for a virgin asphalt.

For standard commercial jobs the dense graded aggregate layer is typically about 8 thick. When 16 to 25 rap is used. The lower layers are the base courses. If you opt for a 3 in.

Thick layer of the finer mix on the surface for a better appearance. Asphalt is an engineered mixture of aggregates. The ideal thickness of this mid surface pavement is approx. In most parts of the country the asphalt laid over a properly prepared aggregate base should be 2 to 3 in.

On top of the base we typically recommend applying two 1 5 layers of asphalt.