What distinguishes hot mix asphalt from cold mix asphalt?

Hot mix asphalt is distinguished from cold mix asphalt primarily by the heating process it undergoes during production. The asphalt binder in hot mix is heated to high temperatures, which ensures that the aggregates and binder mix together thoroughly. This heating process improves the workability and performance of the asphalt, allowing for a stronger, more durable pavement when it is placed and compacted.

The elevated temperatures facilitate better adhesion between the aggregate and binder, resulting in a mixture that performs well under traffic conditions. This makes hot mix asphalt ideal for high-traffic roadways and areas requiring immediate strength and durability.

In contrast, cold mix asphalt does not require heating, which results in different handling and performance characteristics. Cold mix can be prepared and applied at lower ambient temperatures, making it suitable for temporary repairs or locations where hot mix plants are not easily accessible.

Understanding this key aspect of hot mix asphalt production helps in appreciating its applications and advantages in highway construction.