Practice Test Geeks(ATT) ACI Aggregate Testing Technician Practice Test
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Fine Aggregate Quality Tests Flashcards

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Read the first 7 Fine Aggregate Quality Tests flashcards as text

  1. According to ASTM C117, what does the wash method for material finer than the No. 200 sieve measure?

    Answer: Total clay and silt content washed through the sieve

    ASTM C117 determines the amount of material finer than 75 µm (No. 200 sieve) by washing, which removes clay, silt, and dust of fracture.

  2. When performing the organic impurities test (ASTM C40), a color darker than the standard indicates:

    Answer: The aggregate may be injurious and should be further tested

    A color darker than the reference standard solution (Gardner Color Standard No. 11) suggests potentially harmful organic impurities requiring additional testing per ASTM C87.

  3. The fineness modulus of fine aggregate is calculated by summing the cumulative percentages retained on which sieves?

    Answer: No. 100, No. 50, No. 30, No. 16, No. 8, No. 4

    Fineness modulus uses cumulative percent retained on the No. 100, 50, 30, 16, 8, and 4 sieves, divided by 100.

  4. ASTM C128 determines which properties of fine aggregate?

    Answer: Specific gravity and absorption capacity

    ASTM C128 covers the determination of bulk and apparent specific gravity and absorption capacity of fine aggregate.

  5. In ASTM C128, the saturated surface-dry (SSD) condition of fine aggregate is detected using the cone test when:

    Answer: The cone slumps slightly after the mold is lifted

    At SSD, the sand cone slumps slightly — a perfect cone indicates surface moisture present; complete collapse means the aggregate is too dry.

  6. The soundness test for fine aggregate (ASTM C88) uses which reagents to assess durability?

    Answer: Sodium sulfate or magnesium sulfate solution

    ASTM C88 subjects aggregate to repeated immersion in sodium sulfate or magnesium sulfate solutions to simulate weathering and freeze-thaw effects.

  7. ASTM C142 measures which deleterious substance in fine aggregate?

    Answer: Clay lumps and friable particles

    ASTM C142 determines clay lumps and friable particles by hand-crushing moist particles and sieving out the degraded material.