振捣时间过短， 或振捣不到位， 混凝土都无法达到密实状态； 而如果振捣

When vibration <br>between too short, or vibrated in place, the concrete can not achieve its collapsed state; and if the time of vibration <br>between the long, stone sink above the mortar ones, there are more concrete, there is a large shrinkage deformation , <br>Uneven shrinkage is also prone to cracks.

During vibration<br>If the interval is too short or the vibration is not in place, the concrete cannot reach the dense state; When vibrating<br>The interval is too long, the stones sink, there is more mortar on them, there is more cement, and the dry shrinkage deformation is large,<br>Uneven shrinkage is also prone to cracks.

Vibrating time If the interval is too short or the vibration is not in place, the concrete can't reach the dense state; And if vibrating If it is too long, there will be more mortar on the stone when it sinks, and there will be more cement in this place, and the drying shrinkage deformation will be larger. Uneven shrinkage is also prone to cracks.