The 'expansion joint' in a long RC structure is provided to:
Choose the correct answer
Provide additional shear capacity at midspan
Accommodate thermal movement, shrinkage, and differential settlement without causing cracking — IS 456: every 45 m
Only for aesthetic purposes (joint as design feature)
Reduce reinforcement quantity
Correct Answer
B. Accommodate thermal movement, shrinkage, and differential settlement without causing cracking — IS 456: every 45 m
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Expansion joints: deliberate discontinuity in RC structure to accommodate: (1) Thermal expansion/contraction (temperature cycles); (2) Concrete shrinkage; (3) Differential settlement between parts; (4) Seismic separation. IS 456 Cl. 27: provide movement joints at intervals not exceeding 45 m in general. Joint width: 25–50 mm (allows movement). Filled with compressible filler and waterproofed with sealant. Without joints: restrained movement → cracking, structural damage.
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