This standard lays down the structural design requirements for reinforced concrete structures intended for the storage of liquids. It focuses heavily on crack width control, minimum reinforcement requirements, and durability to ensure leak-proof and structurally sound performance.
Specifies design and construction requirements for reinforced concrete liquid retaining structures.
Quick Reference Values
minimum concrete gradeM30
max crack width liquid face0.1 mm
max crack width non liquid face0.2 mm or 0.3 mm depending on exposure
minimum nominal cover45 mm (Severe exposure for liquid retaining face)
max water cement ratio0.45
Key Formulas
Wcr = Design surface crack width evaluated as per Annex B
Ft = Direct tensile stress in concrete
Practical Notes
Limit state of serviceability for cracking usually governs the design of liquid retaining structures, making sections thicker and reinforcement heavier than standard buildings.
Always check the 0.1 mm crack width limit for faces in contact with liquid or enclosing the space above the liquid.
Proper detailing of construction, expansion, and contraction joints using waterstops (as per Part 1) is just as critical as the structural design to prevent leakage.