Hot mix asphalt (HMA) is known by many different names, such as hot mix, asphalt concrete, asphalt or blacktop. It is a combination of stone, sand or gravel bound together by asphalt cement. After it is mixed at a high temperature, laid and compacted, the result is an improved driving surface for the traveling public.

Additives, such as recycled tires or latex, are sometimes incorporated into the mixture design for increased durability. Other additives may be mixed in to reduce temperature and fumes. Since hot mix asphalt is a product of crude oil, the thickness and other qualities of the asphalt help minimize rutting and cracking.

Hot mix asphault illustration

Illustration: Hot Mix Asphalt

Hot mix asphault photo

Photograph: Hot Mix Asphalt

A. Hot mix placement

B. Compaction

C. Texture

D. In service