Another area of importance is the screen deck. Are there excessive wear and/or holes allowing oversized rocks to be stockpiled with aggregates? Visual inspection of the stockpiles will indicate if oversized rocks have been passing through the screen deck. Stockpiles should also be examined for areas of aggregate segregation. Pockets of coarse aggregate can develop if the material is dry, or the aggregates fall a great distance from the stacker belt to the ground. For example, if material containing both coarse and fine particles is placed in a stockpile with sloping sides (cone shape), segregation is sure to occur as larger particles roll down the slope. Building a stockpile in layers can minimize this type of segregation.
If the inspector is uncertain of what is causing stockpiles to end up outside the grading specifications, an aggregate sample may be taken from the stacker belt. The grading results of this sample will help to isolate the problem area at the crusher or stockpile area.
Stockpiles A stockpile is one of the most likely locations to witness segregation of the aggregate
the crusher, stockpiles typically developed with
dump truck are used to haul aggregates the crusher to a long-term storage
aggregates that large and small
are well graded, or contain fractions, segregation of the
material is likely to occur. stockpile can be defined as,
Segregation of a larger aggregates
rolling down the face and bottom of the stockpile.
Numerous taken to
preventative measures can be
Place stockpiles on a draining, stable surface.
clean, dry, free Asphalt concrete
pads may be used to create
a solid stable
aggregate necessary stockpiles
sizes separated by space, or if use a barrier to physically keep separated. When a staker belt is
used to stockpile well the outside edge will be
graded aggregates, coarse, and the area