ACI Concrete Strength Testing Technician Practice Test

What is the maximum allowable deviation from perpendicularity for the ends of the cylinder?

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 from perpendicularity for the ends of the cylinder is essential for ensuring accurate strength testing results. A deviation beyond 0.5 degrees could compromise the integrity of the test results by introducing inaccuracies in load application and measurement of the cylinder's compressive strength. In concrete strength testing, the ends of the specimen must be properly aligned to ensure that the applied load acts evenly and directly through the axis of the cylinder. If the ends are not perpendicular, the load might not be distributed uniformly, potentially leading to premature failure or inaccurate measurements. While some options represent more lenient criteria, adhering strictly to the 0.5-degree maximum ensures compliance with standards that uphold quality and reliability in concrete testing. This precision is crucial for maintaining the integrity of the testing process, aiding in the accurate assessment of the concrete's material properties.