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 recommended time frame for applying cement paste to the freshly molded cylinder?

1 to 3 hours
2 to 4 hours
3 to 5 hours
4 to 6 hours

The correct answer is: 2 to 4 hours

The recommended time frame for applying cement paste to the freshly molded cylinder is between 2 to 4 hours. This timing allows the surface of the concrete to remain in a workable state, ensuring that the bond between the cement paste and the concrete is effective. If the paste is applied too soon, the surface might not have developed sufficient strength to support the paste, leading to potential issues with adhesion and strength. Conversely, if the application is delayed beyond this time frame, the surface can become too hard or dry, preventing proper bonding. This 2 to 4-hour window is crucial in ensuring the integrity and performance of the concrete structure being tested.