The function of an Asphalt Plant is to blend aggregates, asphalt and other filler material in required proportion, as per job mix formula, at elevated temperature to produce a homogenous hot mix asphalt paving mixture.
Asphalt Plants are popularly known as Asphalt Mixing Plant, Asphalt Drum Mix Plant, Hot Mix Plant or Asphalt Mixer. There are basically two types (based on design) of Asphalt Plant (1) Asphalt Batch Mix Plant and (2) Asphalt Drum Mix Plant.
In Asphalt Batching Plant, drying and heating of aggregates takes place in a rotary drum and heated aggregates are weighed & screened in hot bins for proportioning prior to blending with asphalt in separate pugmill type mixer to make up one batch.
In Asphalt Drum Mix Plant the heating, drying and blending of aggregates with the asphalt takes place in the same drum where in feeding of aggregates & asphalt, and output of hot mix asphalt is continuous.
Regardless the type of Asphalt Mixing Plant, the basic purpose is the same to produce the quality hot mix asphalt.
S.P. Enterprise offers the best quality Asphalt Drum Mix Plant to Road Contractors for the production of hot mix asphalt. The basic components of Asphalt Drum Mix Plants are Multiple Cold Aggregate Feeder Bins, Single Deck Scalping Screen, Slinger Conveyor, Rotary Drum, Burner, Multicone Primary Dust Collector, Load out Conveyor, Asphalt Tank, Mineral Filler Unit, Fuel Service Tank, Wet Scrubber and Control Panel with Insulated Control Cabin.
The description on constructional features and working of all the above components is available in our website. Please click here to refer it.
In Asphalt Drum Mix Plant, different size virgin aggregates are stored in multiple feeder bins. Each bin is fitted with manually operated gates and belt conveyor driven by variable speed motor to preset the proportion of the aggregates to be discharged from each bin. Aggregates from all bins are received on gathering belt which transfer them on to single deck scalping screen for oversize material removal. The screened aggregates are then transferred to rotary drying cum mixing drum by slinger conveyor. High pressure jet oil burner fitted at infeed side of the rotary drum dries & heats the aggregate in primary zone of the drum. The heated aggregates then travel to the secondary zone (Coating zone) where they are mixed with the pre metered binders (asphalt & additives) to produce the hot mix asphalt. The hot mix asphalt is transferred to the storage silo or directly into the tipper by load out conveyor fitted with gob hopper.