| Our Industry |
Our IndustryAsphalt Emulsion Manufacturers Association (AEMA)Asphalt emulsions are a vital component of modern transportation infrastructure, offering a cost-effective, energy-efficient, and environmentally responsible alternative to traditional hot-mix asphalt (HMA). These emulsions are created by blending asphalt cement, water, and an emulsifying agent into a stable, water-based mixture. This allows asphalt — a traditionally oil-based product — to be applied at significantly lower temperatures, reducing energy consumption and minimizing harmful emissions. What Are Asphalt Emulsions?First introduced in the early 20th century and gaining widespread use in the 1920s and ’30s, asphalt emulsions have become essential for road maintenance and construction. They are used in a variety of applications, including:
How Asphalt Emulsions Are MadeThe manufacturing process begins by heating asphalt to reduce its viscosity. It is then combined with water and an emulsifying agent in a high-shear colloid mill. The emulsifier enables the asphalt to disperse into microscopic droplets that remain suspended in water, forming a uniform and stable emulsion. Depending on the application, emulsions are formulated to “break” (separate into asphalt and water) at a controlled rate after application. This break time is critical for ensuring proper bonding and curing under varying environmental conditions. To enhance performance, polymer modifiers—such as latex or styrene-butadiene-styrene (SBS)—are often added. These polymer-modified (PM) emulsions offer improved elasticity, durability, and resistance to cracking, making them ideal for high-traffic or extreme-weather environments. They also improve adhesion to aggregates and extend pavement life, delivering better long-term value.
The Lifecycle of Asphalt EmulsionsThe lifecycle begins with the extraction of raw materials. Asphalt is typically a byproduct of petroleum refining, while emulsifiers and polymer additives are produced through chemical processes. These materials are transported to emulsification plants, where they are processed into the final product. Once manufactured, emulsions are stored in insulated tanks and transported to job sites in specialized tankers. Because they can be applied at ambient temperatures (typically below 200°F), asphalt emulsions reduce the risk of burns, lower emissions, and simplify logistics compared to hot-mix asphalt. On-site, emulsions are applied using distributors or mixed with aggregates for use in slurry seals, micro surfacing, or chip seals. They are also used as binding agents in recycled asphalt processes. After application, the water evaporates, leaving behind a uniform asphalt layer bonded to the road surface or aggregate. 
A Sustainable and Smart ChoiceAsphalt emulsions represent a smart, sustainable solution for road construction and preservation. Their lower application temperatures enhance safety and energy efficiency, while customizable formulations ensure performance across diverse conditions. Importantly, asphalt emulsions can complement hot-mix asphalt in a comprehensive asset management strategy. While they sometimes compete with HMA, they also serve as a valuable alternative or supplement, depending on the project’s goals and lifecycle needs. From production to application to eventual recycling, asphalt emulsions support a circular, environmentally responsible pavement lifecycle—meeting the infrastructure demands of today and tomorrow. Learn More |
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Asphalt Emulsion Manufacturers Association
