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Concrete Testing & Evaluation Flashcards

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

Read the first 7 Concrete Testing & Evaluation flashcards as text

  1. According to ASTM C138, what property of fresh concrete is determined by the unit weight test?

    Answer: Air content (by calculation)

    ASTM C138 measures the unit weight (density) of fresh concrete, which can be used to calculate air content when the theoretical density is known.

  2. A concrete mix design specifies a w/cm ratio of 0.45. If the cementitious content is 600 lb/cy, what is the maximum water content allowed per cubic yard?

    Answer: 270 lb

    Maximum water = w/cm ratio × cementitious content = 0.45 × 600 lb = 270 lb per cubic yard.

  3. Which ASTM standard governs the making and curing of concrete test specimens in the field?

    Answer: ASTM C31

    ASTM C31 covers the standard practice for making and curing concrete test specimens in the field.

  4. During a slump test, a concrete sample collapses to one side rather than slumping evenly. This is called a _____ slump and indicates what condition?

    Answer: Shear slump — possible segregation or poor cohesion

    A shear slump where the top slides off to one side indicates poor cohesion and possible segregation, making the test invalid and requiring a retest.

  5. At what age is concrete typically first tested for compressive strength in standard field practice?

    Answer: 28 days

    The standard acceptance age for compressive strength is 28 days, as concrete reaches approximately 99% of its design strength by that time under normal curing.

  6. What is the minimum number of standard 4×8 inch cylinders that should be cast from a single composite sample to constitute one strength test per ACI 318?

    Answer: 2 cylinders

    ACI 318 requires a strength test to consist of the average of at least two cylinders cast from the same composite sample and tested at the same age.

  7. When measuring air content of fresh concrete using the pressure method (ASTM C231), which type of aggregate requires a correction factor?

    Answer: Lightweight aggregate

    Lightweight aggregate is porous and absorbs air pressure, requiring an aggregate correction factor when using the pressure meter method per ASTM C231.