What Do You Put Under Asphalt?

Posted on: July 23, 2022

When laying asphalt on your driveway, you have many options. Some contractors use 6 to 8 inches of compacted aggregate, while others use gravel. In most cases, gravel will serve as the base, but there are exceptions. Read this article to find out more. You’ll be glad you did. Listed below are some of the most common materials used for driveways. Listed in this order:

Aggregate base

An aggregate base is a sublayer of asphalt pavement, and is the foundation for the top layers of pavement. It is composed of various-sized particles ranging from twenty millimeters down to dust. This type of base course is made of recycled asphalt and concrete, or virgin rock. It is used in road construction as a base course, cement pads, foundations, and as backfill material for underground utilities. It is an integral part of the pavement construction process and is abbreviated ABC.

Aggregate base is a commonly used base course for asphalt pavements and other structural foundations. It is also used as backfill material for underground utilities. When used for these applications, it is placed in a dense layer that is compacted to ninety-five percent relative compaction. It provides a solid foundation and prevents the development of cracks or other issues. It also has many other uses. In addition to being a base for asphalt, it also provides a fine grade for pavers.


When paving a driveway, you may be wondering what you put under asphalt. This largely depends on what kind of asphalt you’re using and the structure of the driveway. For a residential driveway, you can put two to three inches of asphalt on the bottom, followed by six to eight inches of granular base aggregate. The thickness of the asphalt layer will vary, depending on the type of use it will get.

A driveway can be asphalt, pea gravel, or a combination of both. Asphalt is made up of two types of aggregate, the coarser and the finer. The finer the aggregate, the smoother the surface will be. The coarser the mix, the more rough the surface will be. Most roads and parking lots use the coarser mix. If you expect heavy traffic, such as RVs and large trucks, the coarser mix is recommended.

Crushed stone

Many people may wonder if crushed stone is what you put under asphalt. After all, this material is widely used for construction, roadbuilding, drainage, paver base, and landscaping. However, many people are unsure of how much crushed stone they need and what size they need. Here are some tips for selecting the right size of crushed stone for your project. The best size will depend on the type of project you’re working on and the size of the driveway or walkway you’re working with.

Whether you’re looking for a driveway or a walkway, crushed stone is an excellent option for many construction projects. It can even be used to mix concrete and asphalt. This versatile material is available in a variety of sizes and shapes. Crushed stone is also widely used as a base material for retaining walls, sidewalks, and irrigation. Despite its numerous uses, this material is relatively inexpensive and can be found in many places.


If you are looking for a durable road surface, a layer of sand under asphalt may be your answer. Asphalt is a very porous material, and sand under asphalt is essential for the durability of the pavement. It is important to understand how sand affects the properties of asphalt. Various types of sand are used in asphalt. These sands may differ in size and composition. This makes it difficult to assess their suitability for hot mix asphalt.

When used as a base layer, sand can be very cost-effective. Typically, this sand is acquired from a quarry in bulk quantities, making it a very good investment. It can also be used for decorative purposes. Sand is often found with small particles of shells and other materials, such as decomposed rock and corals. It can also be used as an adulterant. Sand can be quite durable.

Binding agent

When a highway construction project calls for an improved road surface, one of the first questions that arise is: What is the best binding agent for the asphalt? The answer may seem obvious, but it is not as simple as it seems. Although many highway agencies use asphalt concrete, polymer asphalt concrete offers several benefits. Both types have a lower water saturation factor and average density. However, the viscosity values are different. In order to understand how a binder affects the flow of asphalt, we need to know what the binder is made of.

The binding agents found in asphalt are responsible for the hardness of the asphalt material. While this effect is temporary, if the temperature rises too high, the lighter oil fractions can vaporize. Additionally, the chemical compounds in the asphalt binder undergo oxidation during mixing, transporting, and placement. This process also causes the asphalt material to become stiffer. However, it can be reversed by heating the asphalt until it regains its fluidity.