X hits on this document

PDF document

State of California, Department of Transportation - page 17 / 52

174 views

0 shares

0 downloads

0 comments

17 / 52

can be used to minimize stockpile segregation when used in conjunction with a stacker belt.

When dump

a stockpile is created with a truck or loader, it should be

constructed

in

a

single

layer.

Additional layers can then be placed on top of the lower layers to create a stockpile with minimal segregation of sizes. Equipment should not be used to push or dump aggregates over the side

of a stockpile. and stockpile

Aggregate degradation contamination can be

reduced allowed

if on

heavy equipment is not

the

stockpiles.

When

a

The loader is NOT removing aggregate from the stockpile in a perpendicular direction.

loader created

is used to move stockpiles with a stacker belt, removal

should

occur

in a

perpendicular

direction

to the

aggregate

stream, while

working

the

entire

face

of

the

stockpile.

The

loader

operator

must

make

sure

to

keep

the

loader bucket materials will

from digging into the floor underneath the stockpile, contaminate the aggregate. When feeding a plant from

as underlying a stockpile the

loader operator should disturb the least amount of The loader bucket should be rolled up through adjacent material.

aggregate with each bucket of material. the stockpile to keep from disturbing

If a stockpile does become segregated, the loader operator should re-mix the material before feeding it to the plant. Be careful not to make the segregation worse when re- mixing a stockpile. Discourage a loader operator from feeding one or two bucket of coarse aggregate then one or two buckets of fine aggregate into a cold feed bin in an

effort to reblend the material. moisture content, asphalt content,

This practice will cause voids, and stabilities.

problems

with

gradations,

Batch Plants

Batch

mix

plants

all

work

in

a

similar

fashion, starting with a cold feed storage bin feeding continuous flows of aggregates from the coldfeed bins. The virgin aggregates are fed into a drier drum where they are heated and dried. Upon exiting the drier drum, heated aggregates are carried by a hot elevator to

the screen deck where they into specific sizes. An different aggregate sizes

are separated example of contained in

Document info
Document views174
Page views174
Page last viewedTue Jan 17 13:53:38 UTC 2017
Pages52
Paragraphs1391
Words18161

Comments