When there are bubbles on the concrete surface, in addition to the method of adjusting the operating parameters of the trowel machine mentioned above, further adjustments can be made from the following aspects
Increase the number of trowel passes
Appropriately increase the number of trowel passes of the trowel machine, so that the blade squeezes and presses the concrete surface multiple times, which helps to further squeeze out the bubbles inside the concrete and make the concrete surface more compact and smooth. However, attention should be paid to the time interval between each trowel. It is not advisable to perform the next trowel before the concrete reaches a certain strength, so as not to damage the concrete structure. Generally speaking, it is more appropriate to perform 2-3 trowels after the initial setting of the concrete and before the final setting.
Adjust the pressure of the trowel machine
The pressure of the trowel machine on the concrete surface can be appropriately reduced. If the pressure of the trowel machine is too high, a harder "shell" will form on the concrete surface, which is not conducive to the discharge of bubbles, but may seal the bubbles inside the concrete. By adjusting the counterweight or hydraulic system of the trowel machine, the trowel machine can apply a more appropriate pressure to the concrete surface during operation, so that bubbles can escape the surface more easily. The specific pressure adjustment value needs to be tested and explored according to the state of the concrete and the situation of bubbles.
In the process of adjusting the operating parameters of the trowel machine, it is necessary to closely observe the changes on the concrete surface and make fine adjustments to the parameters in time according to the actual effect to achieve the best trowel effect and eliminate bubbles on the concrete surface. At the same time, it is also possible to combine measures such as optimizing the concrete mix ratio and improving the pouring process to fundamentally reduce the generation of bubbles on the concrete surface.
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