ACI Concrete Strength Testing Technician Practice Test

When the specimen fails, what should be recorded?

1. Minimum load and fracture pattern

2. Average load and type of test

3. Maximum load and type of fracture pattern

4. Load at failure and test duration

The correct answer is: Maximum load and type of fracture pattern

When a concrete specimen fails during testing, it is crucial to accurately document key details about the failure to ensure a comprehensive understanding of the specimen's performance under load. Recording the maximum load achieved at failure is vital because this value provides essential information about the strength characteristics of the concrete, indicating how much force the specimen could withstand before failing. Additionally, noting the type of fracture pattern is important as it can reveal insights about the failure mechanism—whether it was brittle or ductile, for example. The fracture pattern can also indicate whether the failure occurred due to inherent material weaknesses or if it was influenced by testing conditions. This information is critical for analyzing the results of the concrete test. It helps in comparing the performance of different concrete mixes or adjusting specifications for future batches. Understanding both the maximum load and the fracture pattern also aids in quality control and can inform structural design considerations.