ACI Certification Practice Exam

How must strength test specimens be protected during transport to the testing laboratory?

1. Exposed to wind

2. Protected from jarring, moisture loss, and freezing

3. Placed in direct sunlight

4. Wrapped in wet cloth

The correct answer is: Protected from jarring, moisture loss, and freezing

To ensure the integrity and reliability of strength test specimens, it is crucial that they are protected from jarring, moisture loss, and freezing during transport to the testing laboratory. This protection is vital because any disturbance, loss of moisture, or exposure to freezing conditions can compromise the specimens' physical properties and potentially lead to inaccurate test results. Jarring or impacts during transport can cause cracks or other damages to the specimens, altering their intended structure and introducing variables that might skew the test outcomes. Similarly, moisture loss can affect the hydration of concrete specimens, which is essential for achieving the desired strength. If specimens freeze, this can also lead to detrimental changes in their structure, affecting how they perform under test conditions. In summary, ensuring that strength test specimens are secured against physical disturbances, moisture loss, and freezing is fundamental in maintaining their condition for accurate testing and assessment of material strength.