KCP Heavy Industries Co., Ltd. Operation
5-5
5.3 Pumping
Correct mixing of the concrete influences pumping performance.
► Mix the concrete vigorously in the truck mixer at maximum speed. Ensure that the
concrete mix is uniformly prepared.
► Add concrete additives and mix for at least a further four minutes.
► Pour the concrete from the truck mixer, silo, etc into the agitator hopper.
► Switch the agitator on.
► Begin delivery.
Note_________________________________________________________________
Start with a low output and increase this continuously after several volumes.
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Breaks in pumping
You should avoid breaks in pumping as far as possible, as the concrete in the delivery line
can start to set, or can become segregated due to the vibrations of the machine. Note the
following points if breaks are unavoidable:
- Never leave the delivery line under pressure;
- Relieve the delivery line during short breaks in delivery line
reverse pumping briefly (2-3 strokes). Move the concrete at
short intervals by forward and reverse pumping. You
should avoid breaks when pumping concrete with a low
water retentively (tendency to bleeding) as the vibrations
can segregate the concrete. When you restart pumping,
you must leave the pump switched to reverse pumping until
the S- tube switches across fully on both sides. Only then
can you switch over to forwards pumping again.
- Pump the concrete back into the agitator hopper before
long breaks in pumping. You must mix the concrete again
before you recommence pumping.
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