How Asphalt is Made

How Asphalt is Made

How Asphalt is Made


Asphalt is the primary material used to pave roads, parking lots, and driveways. It is a highly durable, cost-effective, and versatile material that is preferred by many contractors and homeowners. However, have you ever thought about how asphalt is made? Understanding the manufacturing process of asphalt can help you understand the material’s quality and durability.

In this blog post, we will discuss how asphalt is made, the ingredients used, and the different types of asphalt. As a leading provider of asphalt paving in Lodi, CA, M. Carroll Blacktop has extensive experience in installing high-quality asphalt driveways, parking lots, and roads. We hope that this information will help you understand asphalt better and make informed decisions when hiring a contractor.


There are two primary types of asphalt: hot mix asphalt (HMA) and cold mix asphalt (CMA). HMA is made at high temperatures, while CMA is made at room temperature. For HMA, the manufacturing process starts with heating aggregates, such as sand and gravel, and mixing them with asphalt cement. Asphalt cement is a petroleum-based material that is refined from crude oil.

Once the mixture is heated, it is transported to the construction site, where it is placed and compacted using heavy equipment. HMA is considered to be the most popular and widely used type of asphalt in the US. It is suitable for heavy traffic areas and has a longer lifespan than CMA.

In contrast, CMA is made using emulsified asphalt, which is mixed with different aggregates, such as sand and crushed rock. This type of asphalt is typically used for patching potholes, repairing cracks, and other minor repairs. Since CMA can be used at room temperature, it is much easier to handle and transport than HMA.

The quality of asphalt depends on the quality of the ingredients used in the manufacturing process. The aggregates used can be natural or synthetic, and their shape and size affect the strength and durability of the asphalt. Additionally, the quality of asphalt cement also affects the performance of the asphalt.

There are also different types of asphalt that are made using different ingredients and manufacturing processes. For example, porous asphalt is made by using larger aggregates and less asphalt cement, creating a permeable surface that reduces stormwater runoff. Stone matrix asphalt is a type of asphalt that has a higher asphalt content and is designed for high-traffic areas.



In conclusion, understanding how asphalt is made is essential for making informed decisions when hiring a contractor, selecting the type of asphalt for your project, and maintaining the asphalt’s quality and durability. At M. Carroll Blacktop, we understand the importance of high-quality asphalt paving and offer a range of services to meet your needs. Contact us today for a free quote and let us help you with your next asphalt project.

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