TVSA T Operations Manual

12. Operating on Wet Concrete
12.1 Steps
12.1.1 To begin, pour the concrete inside
of the forms, slightly higher than the
height of the forms themselves.
12.1.2 Place the screed on top of the
concrete and start the engine.
Do not begin screeding until the engine
is warm and running on its own with
the choke OPEN.
12.1.3 Increase the engine’s RPM until the
clutch engages. The screed will then begin
to vibrate.
12.1.4 Start your screeding process by walking backwards.
(Review pages 17 and 18 for detailed instructions.)
12.1.5 While the throttle level does not require consistent contact, you can adjust the
engine’s RPM and vibration to accommodate your concrete’s moisture. Dry or low slump
concrete may require high vibrations to level and screed correctly.
12.1.6 With the concrete in front of the blade, continue walking backwards to level and
screed.
12.1.7 The blade’s roll back feature ensures concrete does not slide over the blade. Concrete
poured too high may cause the concrete to spill over the blade. If this happens, the screed
will become too heavy to pull, resulting in unevenness.
For detailed instructions on How To Wet Screed and How To Screed Form To Form, refer to
pages 17 and 18.
CAUTION: DO NOT OVER-VIBRATE CONCRETE
Have you used too much vibration? Here’s how to know:
• Concrete is spilling excessively.
• The blade is sinking below the wet pads.
• Concrete is creating ripples or “wake marks” aer screeding.
• Concrete is sliding under the form boards, creating dips and uneven form edges.
The less vibration, the better. Only use enough to comfortably pull the screed when
walking backwards to leave a smooth, level surface.
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