ACI Concrete Strength Testing Technician Practice Test

What is the maximum allowable deviation for the axis of the cylinder not exceeding before checking its vertical alignment?

1. 0.2 degrees

2. 0.5 degrees

3. 1.0 degrees

4. 1.5 degrees

The correct answer is: 0.5 degrees

The maximum allowable deviation for the axis of the cylinder before checking its vertical alignment is important because it ensures that the applied load is distributed evenly across the sample during testing. A deviation that exceeds this limit could lead to inaccurate test results or the failure of the sample in a way that does not accurately reflect its true strength properties. In this case, a deviation of 0.5 degrees is considered acceptable as it is small enough to minimize the risk of uneven stress distribution while allowing for practical handling and setup of the test samples. If the alignment exceeds this threshold, it is necessary to correct the position to ensure the integrity of the test and the validity of the results. This standard is crucial for maintaining the quality and consistency of concrete strength testing protocols.