'Hollow-core pre-stressed slabs' are used in buildings because:
Choose the correct answer
Provide extra mass for earthquake resistance
Reduce self-weight by 30–40% while achieving long spans (up to 20 m) — factory quality, fast erection, no propping needed
Are used only for column design
Only for coastal structures
Correct Answer
B. Reduce self-weight by 30–40% while achieving long spans (up to 20 m) — factory quality, fast erection, no propping needed
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Hollow-core slabs: extruded pre-stressed concrete planks with longitudinal circular/oval voids — reduce self-weight by 30–40%. Pre-stressed: eliminates shear reinforcement needs, long clear spans (up to 20 m). Used in: residential floors, car parks, warehouses. Advantages: (1) Factory-made quality; (2) Fast erection (no formwork, no propping); (3) Sound insulation (hollow cores). Grouted joints between planks. Cannot cantilever freely (no negative bending capacity unless extra rebar added in cores).
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