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Mixing the Material
DANGER
Eye and skin contact with concrete materials
and breathing the dust involved is hazardous
to your health.
• Ensure that there is adequate air
ventilation.
• Wear a dust mask to prevent inhalation of
dust while using the machine; refer to
Operating Practices (page
• Avoid direct contact of cement and
concrete materials with skin and eyes.
Important:
Do not add more material than
the batch capacity of the machine; refer to
Specifications (page
Note:
Follow the manufacturer's instructions that are
printed on the packaging of the product.
Concrete has the following 4 basic ingredients:
•
Sand
•
Gravel
•
Portland cement
•
Water
Depending on the application, you can use different
ratios of these 4 ingredients.
There are many variations of concrete mix recipes,
depending on the application. It is important to use
the appropriate quantity of water. Using too little water
results in dry areas in the mix, but using too much
water will result in weaker concrete. The amount
of water needed varies depending on the moisture
content of the sand and gravel. The mix should have
a thickness similar that of peanut butter.
Keep the poured concrete damp for several days to
obtain proper curing. Evaporation results in weaker
concrete. Concrete cures through hydration, a
reaction between water and cement.
Mixing Pre-Mix Concrete
1.
Ensure that the tilt brake is fully engaged and
that the drum is operating at full speed.
2.
Pour water into the drum.
3.
Add the required amount of dry pre-mix.
4.
Allow the drum to turn while the mix reaches the
appropriate consistency.
Mixing Sand, Gravel, and Cement
The typical ratio for mixing concrete is 1 part Portland
cement, 2 parts sand, and 3 parts gravel.
4).
14).
1.
Ensure that the tilt brake is fully engaged and
that the drum is operating at full speed.
2.
Pour water into the drum.
3.
Add the required amount of gravel.
4.
Add the required amount of Portland cement.
5.
Add the required amount of sand.
6.
Allow the drum to turn while the mix reaches the
appropriate consistency.
Note:
Adding water and gravel before cement and
Safe
sand allows the mix left in the drum from the previous
batch to be tumbled off the drum and paddles and into
the next batch.
Using the Drum
DANGER
Contact with the mixing paddles could cause
damage or injury.
Never put your hands inside the drum at any
time.
Dumping the Drum
Note:
When dumping a batch of material, leave the
engine running so that the rotating drum helps dump
the material.
1.
Align a wheelbarrow or similar container of
adequate capacity in the path of the drum
opening.
2.
While the drum is turning, firmly grasp the
handwheel with one hand.
3.
Using your other hand, pull up on the drum-tilt
brake handle to release the brake.
4.
Using both hands, slowly turn the handwheel,
allowing the drum to tilt in the desired direction
and dump the desired amount of material.
5.
Turn the handwheel in the opposite direction to
return the drum into an upright position.
6.
Push down on the drum-tilt brake to lock
the drum into position, avoiding accidental
discharging of concrete mix.
7.
After dumping a batch of material, clean the
drum; refer to
Note:
This step will clean the paddles and drum
between batches and prevent dried material
from forming and contaminating the next batch
of material.
25
Cleaning the Drum (page
26).
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