ACI Concrete Field Testing Technician - Grade I Practice Exam

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How long should you wait after molding test specimens before moving them to initial storage?

One hour
Two hours
Immediately
Four hours

The correct answer is: Immediately

When test specimens are molded, it is essential that they are allowed to set correctly before being moved to their initial storage conditions. Moving them immediately ensures that the specimens are not prematurely disturbed, which could compromise the integrity of the test results. The standard practices in concrete testing dictate that specimens should remain undisturbed in their molds for the first part of the hydration process. By moving them immediately after molding, you preserve the conditions needed for the initial setting of the concrete, allowing it to begin curing effectively in a controlled environment. This practice is crucial for maintaining the quality and consistency of the concrete specimens, as any delay in moving could risk exposure to non-ideal conditions that might affect the final strength and properties of the concrete tested. Proper handling at this stage is vital to ensure valid and reliable test outcomes.