The Asphalt Manufacturing Process

November 1, 2018 11:22 pm Published by Leave your thoughts

Asphalt is a strong, versatile weather- and chemical-resistant binding substance. When combined with crushed stone, gravel or sand, it turns into a material that is ideal for creating firm, tough, waterproof surfaces like roads and parking lots. However, unless you are a professional in the industry, that likely covers or exceeds your knowledge on the subject. You are not alone, but if you are looking to hire an asphalt paving contractor, understanding the manufacturing process can be incredibly important. Jimini Paving is a full-service contractor specializing in residential and commercial asphalt paving in Washington, and we want to help you understand the manufacturing process before you choose to hire us.

While the exact asphalt manufacturing process can vary, there are some basic steps that most manufacturers follow when creating their mixtures. Here is everything you need to know about how the asphalt we use is manufactured:

  • Step 1: Aggregates, such as stone, gravel and sand, are loaded into the feed bins. A computer will control the amount of aggregate going into the mix. This means that the level of aggregates in a mix can be adjusted, helping manufacturers create different types of mixes for diverse asphalt paving requirements. Aggregates comprise 92 to 96 percent of hot mix asphalt.
  • Step 2: Aggregates are moved from the feed bins to the dryer via a conveyer. Once in the dryer, the aggregates are mixed.
  • Step 3: After the aggregates have been mixed, two recycled products from recycled asphalt mixare added and oil is injected. The recycled products go into the collar, about two-thirds of the way down from the dried aggregate. Adding the recycled products after drying the aggregates prevents the manufacturer from burning off any residual oil. Recycled asphalt mix is stronger, longer lasting and has a stronger rut resistance than virgin asphalt mix.
  • Step 4: Oil is added according to the job requirements, ensuring the mixture meets client specifications. All contents are mixed hot at 200 to 350 degrees Fahrenheit, and then dried. Heat is a critical part of this step, because these materials are nearly impossible to mix and maintain otherwise, and they must be thoroughly combined to become the reliable paving material Jimini Paving uses to create roads, parking lots and port facilities.
  • Step 5: Finally, the mixture is transferred into silos. Up to 1,000 tons can be held at a time. Storage silos are insulated and can be heated, preserving the final mix for days at a time. Once asphalt is mixed with an aggregate, it can accurately be called hot mix asphalt.

While it is not directly stated in the process above, it is important to note that the dust and particulates emitted from the plants are not released into the environment. They are collected and reused during the heating portion of the process using a separate technology. This commitment to the environment is noteworthy for many, including Jimini Paving. We are the qualified provider of asphalt paving in Washington who can assist in pouring and paving your commercial and residential projects. Give Jimini Paving a call today!

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