ACI Concrete Field Testing Technician - Grade I Practice Exam

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Prepare for the ACI Concrete Field Testing Technician - Grade I Exam with interactive quizzes and detailed study materials. Each question is designed to enhance your understanding of concrete testing standards and procedures.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What specifications must the strike-off bar meet for the concrete test method?

Flat, straight steel bar at least 1/4 by 1/2 by 24 inches
Flat, straight steel bar at least 1/8 by 3/4 by 12 inches
Flat, straight aluminum bar of specified dimensions
Round, straight high-density polyethylene rod

The correct answer is: Flat, straight steel bar at least 1/8 by 3/4 by 12 inches

The strike-off bar used in concrete testing must be a flat, straight instrument that is specifically designed to level the surface of the concrete in the test mold. The specifications given in the correct choice specify the dimensions of the bar, which is important for ensuring consistent and accurate results during the testing process. A bar that is at least 1/8 by 3/4 by 12 inches will provide a rigid enough structure to effectively compress and level the concrete mix without deforming or bending during use. This consistency is crucial for achieving uniformity in testing, which contributes to reliable results. In contrast, the other options provide specifications that either do not meet the required dimensions or suggest materials that may not provide the necessary performance for the testing process. For example, while the first option provides a steel bar, the dimensions are larger than what is required, and the use of aluminum or polyethylene in the other choices does not align with the standard specifications for this testing apparatus. The importance of using a specifically dimensioned and material-compliant strike-off bar is essential to uphold the integrity of the test method and ensure reliability in the measurements obtained from concrete samples.