A contractor wants to stop a cast-in-place floor beam pour away from a column line. For beams and slabs, where does ACI direct ordinary floor-system construction joints unless the design permits otherwise?
Correct Answer
B) Within the middle third of the span
ACI 318 provisions for construction joints in floor systems place ordinary joints within the middle third of spans unless the design documents or engineer approve another location. Other choices: the support face, a casual quarter point, or a reinforcing splice location does not match the ACI floor-joint placement rule.
Why This Is the Correct Answer
ACI 318 provisions for construction joints in floor systems place ordinary joints within the middle third of spans unless the design documents or engineer approve another location.
Why the Other Options Are Wrong
Option A: At the face of the support
In concrete work, At the face of the support is the wrong selection for Construction joints: it leaves out the controlling Construction joints result: Within the middle third of the span.
Option C: At any quarter point chosen by the foreman
Choice C gives At any quarter point chosen by the foreman. Its specific error: the option does not produce the required Construction joints outcome, Within the middle third of the span.
Option D: Directly over the largest top bar splice
Choice D (Directly over the largest top bar splice) is rejected because it points to Directly over the largest top bar splice, but.
Memory Technique
File construction joints under a gate: condition first, number or duty second, answer Within the middle third of the span.
Reference Hint
Open ACI 318-19, Building Code Requirements for Structural Concrete; use ACI 318-19 26.5.6 construction joints in floor systems to confirm that ACI 318 provisions for construction joints in floor systems place ordinary joints within the middle third of spans unless the design documents or engineer approve another location.
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