Step 1 – Choose the Right One
For a poured concrete area no more than 1000m2, a walk behind model with 24- to 36-inch long blades is fit for purpose. Prepare the floating-type and finishing-type blades, or a combination of the two for doing this job.When the work area exceeds 1000m2, a ride-on version becomes a necessity. It can speed up the finishing process before the concrete sets too firmly. The blades needed for performing this job should be 36- to 48-inch long. If there are corners or edges on the slab, switch to the 24-inch blade to handle them. Choose either the floating version or finishing version blades for this job. The combined type is also an ideal fit.
Step 2 – Examine the Concrete Slab prior to Troweling
Leave the concrete to hardening for a few hours until it is strong enough to support their body and power trowel. People can test the strength of the concrete by doing a footprint test. Step onto the concrete slab and measure the depth of their footprint. If they sink down 1/8 inch more or less, the concrete is at the right hardness
Step 3 – Float the Concrete to Remove “Hills and Valleys”
1. Use the floating blades or the combined blades to level the concrete surface on their first pass. The floating motion flattens the protrusions and fills the hollows.
2. Run the concrete power trowel at a speed approaching 3/4 of the rated value. In this way, the weight of the machine can be evenly distributed over the concrete slab, thus avoiding the machine digging into the concrete.
3. The rotational speed is kept at a proper level, preventing splatter of concrete pours being thrown forward to block the machine’s passage.4. Overlap the previous pass by 1/2 the length of the trowel blades as they run the machine from one side to the other of the concrete slab.5. When they have finished floating the entire slab once, turn the machine at 90 degrees to their first rows. This crossover floating technique allows them to focus on the spots that are missed in the first finishing session.
Step 4 – Finish the Concrete to Seal, Close and Polish
1. Change the trowel blade to finishing blades. Or theycan resume the finishing work with the combined blades to create a shiny, polished surface, with special attention to seal the bug holes on the slab.
2. Run the power trowel machine at a speed approaching its rated capacity. Lower the blades to come close to the slab surface, in order to apply maximum pressure to the slab.
3. Make a second pass if necessary, focusing on the protrusions, hollows, or corners.
1. Prior to operation, users should put on goggles, ear protection and boots with steel toe and soleplate.
2. Wear heavy leather work gloves while changing power trowel blades.
3. Move slowly when turning corners to keep the power trowel from tipping.
4. Turn off the concrete power trowel machine to clean or change blades.5. Enclose the area, for safety and to prevent marring the concrete.