Continuous Mix Plants
continuous mixing AC plants may range from 100 TPH to 700 TPH. A high capacity plant running at 500 TPH can produce 42 tons of completed mix in 5 minutes. The
illustrate the potential for a quantity of asphalt concrete produced in a very short
large to be time
continuous flow of aggregates from the coldfeed bins is heated in a drier drum. The
aggregates are delivered in an as-used condition without any subsequent except for the removal of oversized rocks if a scalping screen is in place. aggregates have been heated to the desired temperature a continuous flow
screening, After the of asphalt
binder is introduced into the drier controls this continuous operation. completely automatic.
drum mixer or the pug mill mixer. A computer Caltrans specifications require this operation to be
Continuous Mixing Plant Types:
Continuous drum mixing
Continuous pugmill mixing
Storage Bins and Cold Feed Systems Individual bins are used to store different sized aggregates. Storage bins for continuous mix plants are basically the same as the ones used for batch plants,
a few exceptions.
#4 sieve) and
Fine bins (passing supplemental fine
must be equipped with a (bin vibrator) to prevent
material from hanging up in the bins.
Gates located at the bottom of the bins, feed controlled amounts of different aggregate sizes onto the collection belt. Gate openings can be adjusted to increase or decrease the discharge from each bin.
Anytime a cold feed bin gate opening has been adjusted the bin must be re-calibrated. When a change in material occurs, for example, coarse aggregate replaced with fine aggregate, the bin must be re-calibrated with the new material. Typically, bins are