Hot Mix Asphalt (HMA) Manufacturing The basic purpose of a hot
mix asphalt (HMA) plant is to properly proportion, blend, and
heat aggregate and liquid asphalt cement to produce an HMA that
meets the requirements of the job mix formula (JMF) (Roberts et
al., 1996). Modern HMA plants also have the ability to
incorporate reclaimed asphalt pavement (RAP), mineral filler,
fibers, and anti-stripping agents, and will have advanced
environmental systems to limit noise and dust emissions. There
are two basic types of HMA plants commonly in use today: the
batch plant, and the drum mix plant. Batch plants produce HMA in
individual batches while drum plants produce HMA in a continuous
operation. How HMA Is Made Hot mix asphalt (HMA) is produced in
a manufacturing plant that proportions, blends, and heats
aggregate and liquid asphalt cement to produce a material that
conforms to the specific product mix design and job mix formula
(JMF). The JMF ensures that the HMA produced will provide the
designed performance characteri