The quality problem that should be paid attention to by the axe

Empty Drum Crack:

During winter construction, low temperatures can cause the mortar to freeze. When it thaws in spring, this can lead to poor adhesion between the surface layer and the base, resulting in hollowing or even chalking in severe cases. To avoid this, outdoor work should be carried out when temperatures remain above freezing. Winter construction is not recommended.

6.1.2 When backfilling for ground and step bases, it's essential to compact the material in layers. Failure to do so may result in hollow cushions or subsidence cracks in the concrete cushion and base layer. The thickness of the step concrete cushion should not be less than 8 cm. A steel mesh should also be installed beneath the base material. Settlement joints or expansion bars should be included for different foundation types to prevent uneven settlement and cracking.

If the base layer has significant surface irregularities or was improperly constructed, such as when plaster layers are applied too tightly without proper watering or curing, the bond strength between layers will be weak. This increases the risk of hollow cracks between the surface and base layers.

Improper cleaning or treatment of the base layer is often the main cause of cracks in the surface layer. Therefore, strict adherence to process standards is crucial, with special attention given to base preparation and maintenance.

Uneven patterns usually occur due to improper timing of the cutting process, inconsistent pressure during operation, or unsatisfactory finishing. It’s important to provide more technical training, guidance, and sample boards to ensure correct execution during construction.

Pits on the surface can appear if the area wasn’t properly tested before application, or if the surface layer lacks sufficient strength. Ensuring proper testing and material quality control is key to preventing such issues.