ACI Concrete Field Testing Technician - Grade I Practice Exam

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Prepare thoroughly for the ACI Concrete Field Testing Technician - Grade I Exam. Utilize flashcards and multiple-choice questions, which come with hints and thorough explanations. Focus on your path to certification!

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What is the appropriate procedure for measuring slump in a concrete mix?

Use a ruler to measure the height of the collapsed cone
Weigh the concrete before pouring it into the cone
Examine the color and texture of the concrete
Calculate the density of the mix

The correct answer is: Use a ruler to measure the height of the collapsed cone

Measuring slump in a concrete mix is a critical procedure that assesses the consistency and workability of fresh concrete. When using a slump cone, the correct method involves filling the cone with the concrete sample, striking off the excess, and then lifting the cone vertically. The height of the cone is then measured after the concrete has slumped down. The amount by which the concrete has settled from the original height of the cone gives a direct indication of the mix's slump. Using a ruler to measure the height of the collapsed cone directly corresponds to standard practices recommended in ASTM C143, which outlines the slump test procedure. This measurement reflects the mixture's fluidity; a greater slump indicates a wetter mix, while a lower slump indicates a stiffer mix. This is essential for determining the suitability of the concrete for specific applications, as different projects may require particular workability characteristics.