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 unacceptable strength limit when qualifying unbonded caps compared to bonded caps?

  1. 95% of the average of bonded caps

  2. 98% of the average of bonded caps

  3. 100% of the average of bonded caps

  4. 90% of the average of bonded caps

The correct answer is: 98% of the average of bonded caps

When qualifying unbonded caps in comparison to bonded caps, the unacceptable strength limit is set at 98% of the average strength of the bonded caps. This threshold is established to ensure the integrity and reliability of the unbonded caps during strength testing. Using unbonded caps that do not meet this strength criterion may lead to inaccurate strength measurements, which can ultimately compromise the structural safety and performance of concrete elements being tested. The rationale behind the 98% limit ensures that any variability in cap performance does not negatively affect the quality assurance process of concrete testing. Being below this threshold indicates that the unbonded caps might not provide adequate support or could yield misleading strength results, making it critical to adhere to this qualification standard during testing procedures.

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