ACI Concrete Field Testing Technician - Grade I Practice Exam 2025 - Free Concrete Field Testing Practice Questions and Study Guide

Question: 1 / 400

What must the surface be like where the slump mold is placed?

Sloped and dry

Flat, level, moist, nonabsorbent, and free of vibration

The surface on which the slump mold is placed should be flat, level, moist, nonabsorbent, and free of vibration to ensure accurate and reliable test results. A flat and level surface is crucial because any tilt could cause the concrete to settle incorrectly, affecting the slump measurement.

Additionally, a moist surface helps to prevent the dry ground from absorbing water from the concrete mix, which could also impact the consistency and properties being tested. Nonabsorbent surfaces are preferred because they minimize the risk of moisture loss, thus ensuring that the slump test reflects the true workability of the fresh concrete mix. Lastly, a vibration-free environment is critical as vibrations can disrupt the concrete mix during the test and lead to inaccurate measurements. These combined factors lead to a more precise assessment of the concrete's workability.

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Uneven and dry

Wet and uneven

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