ACI Concrete Field Testing Technician - Grade I Practice Exam

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Which of the following is NOT a requirement for the surface on which the slump mold is placed?

Flat and level
Moist
Free of vibration
Rough texture

The correct answer is: Rough texture

The requirement for the slump mold’s surface to be flat and level is essential because it ensures that the slump test is conducted uniformly, allowing for consistent measurements. A moisture condition is also important, as a damp surface can help prevent the concrete from sticking and altering the test's outcome. Likewise, having a surface free of vibration helps maintain stability during the test, which is crucial for accuracy. In contrast, the requirement for a rough texture is not typically considered important for the slump test setup. While a rough surface might not significantly impact the test results, concrete is usually tested on a flat, smooth, and stable surface. Therefore, choosing a rough texture is not a requirement for the successful execution of the slump test.