ACI Concrete Field Testing Technician - Grade I Practice Exam

What weight must the mallet be when tapping the sides of the bowl after rodding each layer?

1. 0.75 lb. (340 g)

2. 2.00 lb. (900 g)

3. 1.25 lb. (600 g)

4. 1.50 lb. (680 g)

The correct answer is: 1.25 lb. (600 g)

The appropriate weight of the mallet when tapping the sides of the bowl after rodding each layer is 1.25 lb. (600 g). This specific weight is recommended to ensure the integrity and consistency of the concrete sample during testing. The mallet's weight allows for adequate energy to transmit through the bowl's sides without causing damage to the bowl or adversely affecting the concrete's structure. It is critical in achieving the proper consolidation of each layer of concrete to ensure that air pockets are reduced and the sample accurately reflects the concrete's properties. This standardization in equipment and procedure helps maintain the quality and reliability of test results in accordance with testing protocols.