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CCIL - Canadian Council of Independent Laboratories Soil Testing and Geotechnical Analysis Questions and Answers Flashcards

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  1. Which ASTM standard covers the Modified Proctor compaction test used when higher compactive effort is required for subgrade evaluation?

    Answer: ASTM D1557

    ASTM D1557 specifies the Modified Proctor test using a 10 lb hammer dropped 18 inches in 5 layers, simulating higher energy compaction.

  2. In a hydrometer analysis of fine-grained soils, what physical law governs the settling velocity of particles in suspension?

    Answer: Stokes' Law

    Stokes' Law relates particle diameter to settling velocity in a viscous fluid, forming the theoretical basis for hydrometer analysis of silt and clay fractions.

  3. What is the purpose of the meniscus correction applied when reading a hydrometer during a particle-size analysis?

    Answer: To account for the curved water surface at the hydrometer stem

    Because the hydrometer stem is read at the top of the meniscus rather than the bottom, a meniscus correction is added to all readings.

  4. During field density testing with a nuclear density gauge, what type of radiation is used to measure soil moisture content?

    Answer: Neutron radiation from an Americium-Beryllium source

    Neutron radiation from an Am-241/Be source interacts with hydrogen atoms in water molecules, allowing indirect measurement of soil moisture content.

  5. What AASHTO classification would a soil with a liquid limit of 45 and plasticity index of 20 most likely fall under?

    Answer: A-7-6

    A soil with LL > 41 and PI > 11, where PI > LL - 30, classifies as A-7-6, indicating a highly plastic clay poor for subgrade use.

  6. What is the CCIL Type I certification specifically designed for technicians performing?

    Answer: Soils and aggregates field testing and sampling

    CCIL Type I certification qualifies technicians to conduct field testing and sampling of soils and aggregates on construction projects.

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Sources & references

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  1. ccil.com — Eligibility, renewal, score validity, test delivery, exam format, time limit · verified Oct 2026
CCIL - Canadian Council of Independent Laboratories Soil Testing and Geotechnical Analysis Questions and Answers Flashcards — CCIL Study Cards with Answers