This Indian Standard specifies the requirements for materials, dimensions, tolerances, manufacture, finish, and testing of precast concrete ribbed or cored floor and roof slabs. It covers units designed to act compositely with in-situ concrete topping.
Specifies requirements for precast concrete ribbed floor slabs, covering dimensions, materials, manufacture, and testing.
Quick Reference Values
Minimum grade of concreteM15
Minimum nominal cover to reinforcement15 mm
Tolerance on overall length± 5 mm
Tolerance on overall depth (rib + topping)± 5 mm
Tolerance on width of rib± 3 mm
Minimum cube strength for M15 at 7 days10 MPa
Practical Notes
Pay close attention to handling and erection procedures to avoid damage to the precast units before they are fully supported and integrated with the structure.
Verify manufacturer's test certificates for strength and dimensional accuracy upon delivery to the site.
Ensure the surface of precast units is clean and suitably roughened to achieve good bond with the in-situ concrete topping, which is critical for composite action.