Practice Test Geeks(ATT) ACI Aggregate Testing Technician Practice Test
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Sampling Aggregates Flashcards

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  1. What does 'nominal maximum size' of an aggregate refer to in the context of sampling?

    Answer: The smallest sieve that retains more than 10% of the material

    Nominal maximum size is the smallest sieve opening through which the entire amount of aggregate is permitted to pass, retaining no more than 10% on that sieve.

  2. Why must sampling equipment be clean and free of residue before collecting an aggregate sample?

    Answer: Residue from previous samples can contaminate and alter gradation or test results

    Contamination from previous samples can alter the particle size distribution, chemical composition, or moisture content of the new sample.

  3. What action should be taken if a field sample arrives at the laboratory with obvious segregation in the container?

    Answer: Re-mix the entire container thoroughly before reducing the sample

    ASTM C702 requires thorough remixing before reduction to reintegrate any segregated particles and restore the sample's representativeness.

  4. The riffle splitter (mechanical sample splitter) divides a sample by:

    Answer: Directing alternating chutes of material into two equal pans

    A riffle splitter has an even number of chutes that alternate direction, splitting the stream into two roughly equal halves by mass.

  5. When quartering aggregate by hand, after dividing the sample into four equal parts, which portions are retained for the test sample?

    Answer: Two opposite quadrants

    Quartering retains two diagonally opposite quadrants, which together represent the original sample, while discarding the other two opposite quadrants.

  6. Which environmental condition is most likely to affect the moisture content of a field sample between collection and testing?

    Answer: Prolonged exposure to direct sunlight or wind in an open container

    Open exposure to sun and wind causes evaporative drying that alters moisture content, potentially affecting absorption and unit weight tests.

  7. For acceptance testing purposes, who typically has authority to determine the sampling location and frequency?

    Answer: The purchaser or the specifying agency

    The purchaser or specifying agency establishes sampling frequency and location requirements as part of the project acceptance criteria.