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

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  1. In fine aggregate testing, absorption capacity (ASTM C128) is defined as:

    Answer: Moisture increase from oven-dry to SSD state expressed as a percent of oven-dry mass

    Absorption is the increase in mass due to water filling permeable pores, measured from oven-dry to SSD state, expressed as a percentage of oven-dry mass.

  2. For the rodded unit weight test (ASTM C29), the tamping rod used for a 1/10 ft³ (2.8 L) container must be:

    Answer: 5/8 in. (16 mm) diameter round, bullet-tipped rod, 24 in. long

    ASTM C29 specifies a 5/8 in. (16 mm) diameter, 24 in. (600 mm) long round rod with a hemispherical tip for rodding the standard measure.

  3. A fine aggregate gradation is considered to be 'gap-graded' when:

    Answer: One or more intermediate sieve sizes retain little or no material

    Gap-graded aggregate is missing one or more intermediate particle size fractions, leaving gaps in the gradation curve.

  4. Which sieve size is used to separate fine and coarse aggregate for classification purposes under ASTM C33?

    Answer: No. 4 (4.75 mm)

    The No. 4 sieve (4.75 mm) is the dividing line: material passing it is fine aggregate; material retained is coarse aggregate per ASTM C33.

  5. When the mortar strength ratio in ASTM C87 is at least what percentage, the organic content is considered acceptable?

    Answer: 95%

    ASTM C87 requires that the compressive strength of mortar with the suspect aggregate be at least 95% of the strength of mortar made with washed aggregate.

  6. The ASTM C33 maximum percentage of clay lumps and friable particles allowed in fine aggregate is:

    Answer: 3.0%

    ASTM C33 limits clay lumps and friable particles in fine aggregate to a maximum of 3.0% by mass.

  7. When using the ASTM C136 sieve analysis, the percent passing each sieve is calculated based on:

    Answer: The total original dry sample mass before washing

    All percentages in ASTM C136 are calculated as a proportion of the total original dry sample mass, ensuring mass balance is verified.