By adjusting the operating parameters of the power trowel, what quality problems of the concrete surface can be solved?

Adjusting the operating parameters of the trowel machine can solve the following quality problems of the concrete surface:
 

Uneven surface:

Adjust the speed: The speed of the trowel machine has an important influence on the flatness of the concrete surface. If the speed is too fast, the trowel blade may produce too much cutting force on the concrete surface, resulting in uneven surface; if the speed is too slow, the concrete surface may not be effectively smoothed. By appropriately reducing or increasing the speed of the trowel machine, the blade can act evenly on the concrete surface, which can improve the surface flatness.
Adjust the trowel time: If the trowel time is too early, the concrete has not reached a certain strength, and it is easy to produce dents or marks during the trowel process; if the trowel time is too late, the concrete strength is too high, and the trowel machine is difficult to effectively trim the surface. According to factors such as the concrete mix ratio and ambient temperature, reasonable adjustment of the trowel time can make the concrete surface achieve better flatness.
 

Surface sanding:

Adjusting the pressure: If the pressure applied by the trowel is too high during operation, the cement slurry on the concrete surface will be over-extruded, resulting in a thin cement slurry layer on the surface, which is prone to sanding; if the pressure is too low, the concrete surface cannot be compacted, which will also affect the surface quality. Properly adjusting the pressure of the trowel so that it can make the concrete surface compact while not over-extruding the cement slurry during operation will help solve the problem of surface sanding.
Choose the right blade: Trowel blades of different materials and shapes have different effects on the concrete surface. For example, a blade with higher hardness and sharper edge may cut off some tiny particles on the concrete surface during troweling, increasing the risk of sanding; while a blade with a softer or blunter edge may not be able to effectively compact the surface. Choosing a blade with moderate material and appropriate edge shape can reduce surface sanding caused by blade factors.
 

Surface cracks:

Control the troweling speed: If the water on the concrete surface evaporates quickly, if the trowel speed is too fast, it will accelerate the loss of surface water, causing cracks on the concrete surface due to drying shrinkage. Reduce the operating speed of the trowel machine to allow the concrete surface enough time for water migration and cement hydration reaction, which can reduce cracks caused by drying shrinkage.
Adjust the number of trowel passes: Too many trowel passes may cause excessive disturbance to the concrete surface, destroy the formed structure, and cause cracks on the surface; too few passes may not make the surface achieve sufficient density and finish. According to the performance and surface condition of the concrete, reasonably adjust the number of trowel passes to ensure surface quality and avoid cracks caused by excessive troweling.

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