A cast-in-place interior beam has stirrups and longitudinal reinforcement enclosed by forms, and the member will not contact soil or weather. Which cover is the ACI minimum for the beam reinforcement?
Correct Answer
A) 1-1/2 in. for beam reinforcement not exposed to weather
ACI 318-19 Table 20.6.1.3.1 lists 1-1/2 in. minimum cover for beams, columns, pedestals, and tension ties not exposed to weather or in contact with ground. Other choices: 3/4 in. is an interior slab, wall, or joist value; 2 in. applies to larger bars in formed exterior exposure, and 3 in. applies where reinforcement is cast against earth.
Why This Is the Correct Answer
ACI 318-19 Table 20.6.1.3.1 lists 1-1/2 in. minimum cover for beams, columns, pedestals, and tension ties not exposed to weather or in contact with ground.
Why the Other Options Are Wrong
Option B: 3/4 in. for interior slab, wall, or joist reinforcement
In concrete work, 3/4 in. for interior slab, wall, or joist reinforcement is the wrong selection for Concrete cover - interior beam reinforcement: 3/4 in.
Option C: 2 in. for larger bars in formed exterior concrete
The trap in C is 2 in. for larger bars in formed exterior concrete. That selection is wrong because 2 in. for larger bars in formed exterior concrete is a concrete-cover value for a different exposure/member case; ACI 318-19 Table 20.6.1.3.1 keys this item to 1-1/2 in.
Option D: 3 in. for reinforcement cast against earth
Choice D gives 3 in. for reinforcement cast against earth. Its specific error: 3 in. for reinforcement cast against earth is a concrete-cover value for a different exposure/member case; ACI 318-19 Table 20.6.1.3.1 keys this item to 1-1/2 in.
Memory Technique
Make concrete cover - interior beam reinforcement a tabbed card: cite the exact condition, then choose 1-1/2 in. for beam reinforcement not exposed to weather.
Reference Hint
Open ACI 318-19, Building Code Requirements for Structural Concrete; use ACI 318-19 Table 20.6.1.3.1 to confirm that ACI 318-19 Table 20.6.1.3.1 lists 1-1/2 in.
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