Is it necessary to tap the sides of the measuring bowl?

Tapping the sides of the measuring bowl during the process of taking a concrete sample is necessary to ensure that the material consolidates properly. This action helps to eliminate air bubbles that may be trapped in the concrete mix, which can affect the accuracy of the measurement and the quality of the sample. Proper consolidation is crucial for achieving a representative sample and for ensuring that the material properties can be accurately assessed in accordance with industry standards.

In circumstances where air bubbles are not eliminated, the resulting sample may yield misleading results in terms of workability, strength, or durability of the concrete. Therefore, tapping serves as a critical quality control measure in concrete testing. It is applicable under all conditions, not limited to a specific state of humidity or dryness of the mix.