ACI Concrete Field Testing Technician - Grade I Practice Exam

During transportation, test specimens must be protected from which of the following?

1. Vibrations, cold temperatures, and moisture loss

2. Jarring, freezing temperatures, and moisture loss

3. Heat, rain, and jarring

4. Wind, cold temperatures, and jarring

The correct answer is: Jarring, freezing temperatures, and moisture loss

The correct choice emphasizes the critical aspects of protecting test specimens during transportation to ensure their integrity and reliability when it comes to testing. Jarring can cause physical damage to the specimens, such as cracking or breaking, which compromises the test results. Particularly for concrete specimens that need to maintain their form and strength characteristics, any sudden impact during transport can lead to inconsistent or invalid results. Freezing temperatures present another significant risk, especially for fresh concrete specimens. If these specimens freeze, it can severely alter their properties, making the results of any subsequent tests unreliable. Thus, avoiding exposure to freezing conditions is crucial for maintaining the accuracy of test outcomes. Moisture loss is equally important to consider. For concrete, evaporation can lead to changes in the water-cement ratio as the specimen dries out, which can affect its strength and durability. Proper moisture preservation is essential to maintain the physical and chemical characteristics intended for testing. In combination, these factors highlight the need for careful handling and transportation procedures that mitigate risks associated with jarring, freezing temperatures, and moisture loss, ensuring that the integrity of the specimens is preserved until testing occurs.