ACI Certification Practice Exam

Question: 1 / 400

What is the maximum time length of the Slump test?

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2.5 seconds

The maximum time length of the Slump test is established to ensure the integrity and reliability of the test results. According to standard procedures, after the concrete cone is raised, the time taken for the slump measurement should not exceed 2.5 seconds. This time frame is critical because any delay beyond the specified duration could result in changes to the concrete's properties due to effects like hydration or changes in water content, leading to inaccurate measurements.

In practice, maintaining this time limit helps in capturing a representative amount of the slump before the concrete begins to settle or lose consistency, thus ensuring the test accurately reflects the concrete's workability and other relevant properties. Adhering to this maximum time limit is essential for achieving consistent and reliable results when assessing the quality of concrete mix designs.

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