ACI Concrete Strength Testing Technician Practice Test

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Get ready for the ACI Concrete Strength Testing Technician exam with comprehensive quizzes featuring flashcards and multiple choice questions. Each question includes hints and explanations to help you understand all aspects of concrete strength testing.

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What is the required thickness of the pads used in ASTM C1231?

1/4 ± 1/16 in.
1/2 ± 1/16 in.
3/4 ± 1/8 in.
1/8 ± 1/16 in.

The correct answer is: 1/2 ± 1/16 in.

The required thickness of the pads used in ASTM C1231 is indeed specified as 1/2 ± 1/16 in. This standard pertains to the use of compressible pads during the testing of concrete cylinders to help ensure accurate and reliable test results. The pads serve to distribute the load evenly across the surface of the specimen, reducing the influence of any imperfections or irregularities on the surfaces of the test specimen and the testing machine. Using the specified thickness of 1/2 inch, within the allowable tolerance, ensures that the pads provide the right amount of compressibility to absorb any stress concentration and to maintain the alignment of the test specimen. This precision is crucial for achieving accurate measurements of concrete strength during testing, making this specification an important detail in concrete testing protocols.