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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.

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  1. The Windsor probe test is used to estimate which concrete property non-destructively?

    Answer: In-place compressive strength

    The Windsor probe system estimates in-place compressive strength by measuring the penetration depth of a hardened steel probe driven by a powder-actuated driver.

  2. According to ASTM C805, rebound hammer readings should be taken at a minimum of how many points on a test area to get a valid average?

    Answer: 10 readings

    ASTM C805 requires a minimum of 10 rebound readings per test area, discarding any that differ from the median by more than 6 units.

  3. Carbonation of concrete surface affects rebound hammer readings by causing them to be:

    Answer: Higher than actual strength

    Surface carbonation hardens the concrete surface layer, causing the hammer to read higher than the actual bulk compressive strength of the element.

  4. When cores are taken to evaluate structural concrete strength per ACI 318, what is the minimum number of cores required per location of concern?

    Answer: 3 cores

    ACI 318 requires a minimum of three cores per questionable location; the concrete is considered adequate if the average of three cores ≥ 0.85f'c and no single core < 0.75f'c.

  5. What correction factor is applied to a concrete core with a length-to-diameter (L/D) ratio of 1.75 when converting to the equivalent standard cylinder strength?

    Answer: Multiply by a factor less than 1.0

    Cores with L/D below 2.0 require a correction factor less than 1.0 per ASTM C42, as shorter specimens register higher apparent strength than standard 2:1 cylinders.

  6. The pullout test method for in-place concrete strength measurement is governed by which ASTM standard?

    Answer: ASTM C900

    ASTM C900 covers the pullout strength of hardened concrete by measuring the force required to pull a pre-inserted or post-installed insert from the concrete.

  7. Chloride ion permeability of hardened concrete is quantified in coulombs using which ASTM test?

    Answer: ASTM C1202

    ASTM C1202 (Rapid Chloride Permeability Test) measures the electrical charge passed through a 2-inch concrete disc over 6 hours to assess chloride ion penetrability.