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each bin may be, the #1 bin; ¾” x ½”, the #2 bin; ½” x

”, the #3 bin;

#4

bin;

No.4

x

No.200.

The

proportions

for

each

batch

ingredient

” x No.4, and the are pre-set in the

controller. A computer or some other electronic controls the weight of individual batch ingredients.

proportioning

device

automatically

The batching

system

must be fully

automatic to materials for

the one

extent that the only batch shall be a single

manual operation required for operation of a switch or starter.

proportioning

all

#1 BIN

#2 BIN

#3 BIN

#4 BIN

ASPHALT

1429 lbs.

952 lbs.

3333 lbs.

3810 lbs.

476 lbs.

An example of a 5-ton asphalt concrete batch with a target of five percent asphalt binder might be:

Storage Bins and Cold Feed Systems The aggregate storage bins and cold feed system used with a batch type plant, move cold (unheated) aggregate to the plant for processing. A loader is typically used to fill the cold feed storage bins. Extreme care must be taken by the loader operator when scooping up material from the stockpile at ground level. If the loader operator digs too deep, contamination of the

aggregates with soil materials will occur.

or underlying This type of

contamination will

affect the gradation,

stability,

and

other

mix

qualities.

Storage

bins

must

have

bulkheads

sand

equivalent,

asphalt

content,

between each bin to prevent intermingling of the different sizes.

Good separation between coldfeed bins is not only good practice, but is required by Caltrans. These large bin dividers will not allow aggregates to over flow into adjacent bins.

Gates located at the bottom of the bins, regulate the amount of aggregate that discharges onto the collection belt. Gate openings can be adjusted to increase or decrease the discharge

from each bin. variable speed the amount of each bin, too.

Feeder controls (i.e., motors) can regulate material flowing from

The system, when

functioning continuous

properly, provides a and uniform flow of

properly graded aggregate to the plant.

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