When the concrete is to be consolidated by vibration, the measure is filled in how many layers?

When consolidating concrete using vibration, the measure is typically filled in two approximately equal layers to ensure proper compaction. This practice allows for more effective and uniform consolidation throughout the sample. By dividing the concrete into two layers, each layer can be individually vibrated to eliminate air pockets and improve the overall density and strength of the concrete.

Filling the measure in one layer might lead to inadequate consolidation, as the vibration may not reach the bottom effectively, leaving more air voids. More than two layers can complicate the process; it could become difficult to achieve uniform compaction and proper working time for each layer, potentially resulting in inconsistent quality. Therefore, using two layers strikes a balance between thorough consolidation and practical execution of the task.