Practice Test Geeks(NETTCP) New England Transportation Technician Certification Program Practice Test
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Concrete Testing Flashcards

7 cards from real NETTCP 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 flashcards as text

  1. A concrete cylinder fails at 3,800 psi at 28 days when the specified f'c is 4,000 psi. What is the immediate required action?

    Answer: Investigate per ACI 318 — core the structure or use other strength evidence

    ACI 318 requires investigation when cylinders fall below f'c, which may include coring the in-place concrete before rejection.

  2. During a concrete pour in cold weather, the minimum concrete temperature as delivered is typically required to be at least:

    Answer: 50°F (10°C)

    ACI 306 requires fresh concrete temperature to be at least 50°F (10°C) as delivered to maintain adequate strength gain in cold weather.

  3. What does a Type C fracture pattern (cone and split) in a 4×8-inch cylinder typically indicate?

    Answer: An acceptable fracture pattern within normal test expectations

    A cone-and-split fracture (Type 3 per ASTM C39) is a normal, acceptable fracture pattern for cylinder compression tests.

  4. For a concrete air content test using the volumetric method (AASHTO T 196), which aggregate type requires this method instead of the pressure meter?

    Answer: Lightweight aggregate

    The volumetric method is required for lightweight aggregates and highly porous aggregates that absorb pressure, making the pressure method unreliable.

  5. When transporting fresh concrete field samples to the testing area, the maximum elapsed time between obtaining the sample and starting tests is:

    Answer: 15 minutes

    AASHTO R 60 requires that tests begin within 15 minutes of obtaining the composite sample.

  6. In the NETTCP program, which test is used to evaluate the resistance of hardened concrete to chloride ion penetration?

    Answer: AASHTO T 259 (Ponding Test) or AASHTO T 277 (Rapid Chloride Permeability)

    Chloride permeability is measured by the 90-day ponding test (T 259) or the rapid chloride permeability test (T 277/ASTM C1202).

  7. What is the primary reason concrete cylinders are stored in a moist room or lime-saturated water bath during standard curing?

    Answer: To maintain adequate moisture for continued cement hydration

    Moist curing prevents moisture loss so that cement hydration can continue, which is essential for strength development.