ACI Concrete Field Testing Technician - Grade I Practice Exam

Question: 1 / 400

The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes.

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The maximum allowable time between obtaining the first and final portions of a composite sample is 15 minutes. This time limit is critical because it ensures that the sample collected is representative of the concrete being tested. The properties of concrete, such as workability and composition, can change rapidly during transport or waiting time, especially with factors like evaporation or chemical reactions beginning to take place.

By adhering to this 15-minute guideline, technicians can ensure that the composite sample reflects the state of the concrete as closely as possible at the time of mixing. This helps in producing reliable test results that accurately represent the concrete's quality, thereby minimizing discrepancies due to timing issues.

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