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Field Testing Technician Flashcards

7 cards from real ACI Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Field Testing Technician flashcards as text

  1. Per ASTM C31, standard 4x8 inch (100x200 mm) concrete test cylinders are filled in:

    Answer: 2 approximately equal layers

    ASTM C31 requires filling 4x8 inch cylinders in 2 approximately equal layers.

  2. When rodding a 4x8 inch cylinder per ASTM C31, how many strokes are applied per layer?

    Answer: 25 strokes

    ASTM C31 specifies 25 uniformly distributed rodding strokes per layer for 4x8 inch cylinders.

  3. Per ASTM C31, concrete with a slump of 1 inch (25 mm) or less must be consolidated in cylinder molds by:

    Answer: Internal vibration

    ASTM C31 requires internal vibration for concrete with slump at or below 1 inch because hand rodding cannot adequately consolidate stiff mixes.

  4. Per ASTM C31, the required initial curing temperature range for standard-cured specimens is:

    Answer: 60F to 80F (16C to 27C)

    ASTM C31 requires standard-cured specimens to be maintained between 60F and 80F (16C to 27C) during the initial curing period.

  5. Immediately after finishing the top surface of concrete cylinders in the field per ASTM C31, the molds should be covered with:

    Answer: A non-absorbent, non-reactive plate or plastic lid

    A non-absorbent, non-reactive cover must be placed over freshly filled cylinders immediately to prevent surface moisture loss.

  6. Per ASTM C31, standard-cured concrete cylinders shall be removed from their molds:

    Answer: 24 plus or minus 8 hours after molding

    ASTM C31 specifies demolding standard-cured specimens 24 plus or minus 8 hours after molding, then placing them immediately in moist curing.

  7. When transporting fresh concrete test cylinders to the laboratory per ASTM C31, specimens must be protected from:

    Answer: Vibration, jolting, and rough handling that could damage the specimens

    Cylinders at early stages of hydration are vulnerable to physical damage, so they must be shielded from vibration and rough handling during transport.