ACI Concrete Field Testing Technician - Grade I Practice Exam

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What is the length requirement for the tamping rod used in this testing method?

  1. At least 300 mm (12 in.)

  2. At least 400 mm (16 in.)

  3. At least 100 mm greater than the depth of the measuring bowl

  4. At least 600 mm (24 in.) in overall length

The correct answer is: At least 100 mm greater than the depth of the measuring bowl

The correct answer is based on the specific requirement for the tamping rod used in concrete testing methods, particularly the one for measuring the slump of concrete. The specification that the tamping rod must be at least 100 mm greater than the depth of the measuring bowl ensures that the rod can effectively reach the bottom of the bowl and provide adequate compaction of the concrete being tested. This is crucial for achieving accurate test results, as effective tamping influences the overall stability and integrity of the concrete sample. Using a rod that meets this requirement allows for consistent and reliable compaction, which is critical in assessing the workability of concrete mixes. Consequently, the measurement guideline not only contributes to the precision of the slump test but also aligns with the standards set forth by organizations like ASTM, which govern such testing practices.

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