IS 11843:1986 is the Indian Standard (BIS) for recommendations for corrosion protection for reinforcement in concrete. This standard provides recommendations and guidelines on various methods for protecting steel reinforcement from corrosion in concrete. It covers the principles of corrosion and details protective measures like high-quality concrete, coatings (epoxy, galvanizing), corrosion-inhibiting admixtures, and cathodic protection, particularly for structures in aggressive environments like coastal and industrial zones.
Offers recommendations for protecting steel reinforcement against corrosion in concrete, important for long-term durability.
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 Cover (Moderate Exposure) | 30 mm (as per IS 456:2000) | Nominal cover c_nom = 35 mm (for XC3/XC4, c_min,dur=25mm + Δc_dev=10mm) | EN 206 / BS 8500 |
| Maximum Water-Cement Ratio (Severe Exposure) | 0.45 (as per IS 456:2000) | 0.45 (for marine exposure XS1/XS2) | EN 206:2013+A2:2021 |
| Total Chloride Content Limit (Reinforced Concrete) | 0.4 kg/m³ of concrete (as per IS 456:2000) | 0.40% by mass of cement (Class Cl 0,40) | EN 206:2013+A2:2021 |
| Epoxy Coating Thickness (FBE) | Not specified in detail, recommends 'suitable protective coating'. | 175 to 300 µm (microns) | ISO 14654:2018 |
| pH for Steel Passivity | pH > 12.5 is stated as required. | Typically in the range of 12.5 to 13.5. | ACI PRC-222-21 |
| Permissible Coating Defects (Holidays) | Not specified. | A specified rate based on test methods, e.g., typically less than 2-4 per meter depending on standard. | ISO 14654 / ASTM A775 |