IS 6523:1983 is the Indian Standard (BIS) for precast reinforced concrete door and window frames. This standard specifies the requirements for materials, dimensions, reinforcement, manufacture, finishing, and testing of precast reinforced concrete door, window, and ventilator frames. It provides standard dimensions and reinforcement details for various frame profiles.
Precast Reinforced Concrete Door and Window Frames
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Concrete Grade (Strength) | M15 (Characteristic compressive strength of 15 N/mm²) | No prescribed minimum; design based on performance. Practically, C20/25 (20 N/mm²) is a common minimum for durability per EN 1992-1-1. | BS EN 845-2 / EN 1992-1-1 |
| Minimum Longitudinal Reinforcement | Prescribed, e.g., 2 bars of 6 mm dia. for section 75x60 mm. | Not prescribed. Must be designed to achieve the declared load-bearing capacity according to EN 1992-1-1. | BS EN 845-2 |
| Minimum Cover to Reinforcement | 15 mm or bar diameter, whichever is greater. | Depends on exposure class (e.g., XC1, XC3) and fire rating. Typically 20-30 mm for moderate exposure. | EN 1992-1-1 (referenced by BS EN 845-2) |
| Transverse Strength Test Requirement | Prescribed minimum loads. E.g., for a 75x60mm section on a 1m span, failure load must be ≥ 2.25 kN. | Manufacturer must test and declare the load-bearing capacity. The product must meet its declared value. | BS EN 845-2:2013+A1:2016 |
| Length Tolerance | ± 3 mm | Manufacturer to declare, but guidance suggests classes, e.g., Class T1 is ±5 mm or L/300. | BS EN 845-2:2013+A1:2016 |
| Squareness of Cross-Section Tolerance | ± 2 mm | No direct equivalent; covered under general cross-sectional dimension tolerances (e.g., ± 3 mm for height/width). | BS EN 845-2:2013+A1:2016 |
| Curing Requirement | Kept constantly moist for at least 7 days. | Not prescribed prescriptively; the manufacturing process (under Factory Production Control) must ensure concrete achieves specified properties. | BS EN 845-2:2013+A1:2016 |