Pre-cast concrete elements are preferred over in-situ because:
Choose the correct answer
Pre-cast is always cheaper in all cases
Better quality control, faster erection, less site labour/formwork, repetitive elements — especially for bridges and floors
Pre-cast requires no joints between elements
Pre-cast can only be used for walls
Correct Answer
B. Better quality control, faster erection, less site labour/formwork, repetitive elements — especially for bridges and floors
Why is this the answer?
Pre-cast advantages: (1) Factory quality control (better strength, durability); (2) Faster construction (erection speed); (3) Reduced site formwork and labour; (4) Reduced curing time on site; (5) Repetitive elements (economy). Disadvantages: heavy lifting, joints between elements (design challenge), transportation limits (max ~25 m length on road), not easily modified. Used for: bridge girders, hollow-core slabs, columns, spun poles.
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