ACI Certification Practice Exam

True or False: After rodding each layer, the sides of the molds should be tapped with a tapping rod.

1. True

2. False

3. Only if instructed

4. It depends on the concrete mix

The correct answer is: False

The statement that after rodding each layer, the sides of the molds should be tapped with a tapping rod is considered false. Tapping the sides of molds is not a standard procedure following the rodding of each layer. Instead, the proper practice involves rodding to ensure the concrete is evenly distributed and consolidated within the mold. After rodding, it is more important to level off the surface of the concrete rather than engage in additional tapping. In general, tapping the mold may cause unnecessary vibration or movement in the concrete that could affect the results of the sample, especially in terms of achieving the correct density and preventing segregation. Each step of the concrete preparation and curing process has specific guidelines intended to ensure accuracy and consistency, so it is crucial to adhere strictly to these practices.