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Structural Engineering and Materials Flashcards

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

Read the first 7 Structural Engineering and Materials flashcards as text

  1. Per ACI 318, what is the minimum specified cover for cast-in-place concrete cast against and permanently exposed to earth?

    Answer: 3 in.

    ACI 318 requires 3 in. of cover for concrete cast directly against earth.

  2. At what age is the specified compressive strength f'c of concrete normally determined?

    Answer: 28 days

    f'c is based on cylinder tests at 28 days unless the contract specifies another age.

  3. The slump test (ASTM C143) is mainly used to measure which property of fresh concrete?

    Answer: Workability/consistency

    Slump measures the consistency, or workability, of fresh concrete.

  4. In the ACI rectangular stress block, what is β1 for concrete with f'c ≤ 4,000 psi?

    Answer: 0.85

    β1 = 0.85 for f'c up to 4,000 psi and drops by 0.05 per 1,000 psi above that, down to a minimum of 0.65.

  5. All else equal, what is the main effect of raising the water-cement ratio of a concrete mix?

    Answer: Lower strength and durability

    Per Abrams' law, a higher w/c ratio adds porosity, which lowers strength and durability.

  6. Which ASCE 7 LRFD load combination typically governs for gravity-only dead and live load?

    Answer: 1.2D + 1.6L

    1.2D + 1.6L (+0.5 of roof load) is the usual governing gravity combination; 1.4D governs only when live load is very small.

  7. What is the degree of static indeterminacy of a propped cantilever (fixed at one end, roller at the other)?

    Answer: 1

    It has 4 reactions and 3 equilibrium equations, so it is indeterminate to the first degree.