IS 2180:1988 is the Indian Standard (BIS) for heavy duty burnt clay building bricks - specification. This standard lays down the specific requirements for heavy-duty burnt clay building bricks, which are required for heavy engineering construction such as bridge structures, industrial foundations, and multi-story load-bearing walls. It specifies classification, dimensions, physical requirements like high compressive strength, low water absorption, and nil efflorescence.
Specifies requirements for heavy-duty burnt clay building bricks used in structures subjected to heavy loads.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Compressive Strength (Heavy Duty) | 40.0 N/mm² (for Class 400) | 20.7 N/mm² (3000 psi) for Grade SW (Severe Weathering) | ASTM C62-17 |
| Maximum Water Absorption (by boiling) | 15% by mass | 17.0% by mass (average of 5 bricks) for Grade SW | ASTM C62-17 |
| Dimensional Tolerance (Length) | ±3% of specified length | Category T2: ±(4 mm + 0.05% of length); Category R1: Range limit of 10 mm | BS EN 771-1 |
| Efflorescence / Soluble Salts Control | Visual rating should not be worse than 'Moderate' | Categorized by active soluble salt content (e.g., S1: ≤ 0.06% Na⁺+K⁺+Mg²⁺; S2: ≤ 0.03%) | BS EN 771-1 |
| Warpage | Maximum 3 mm | Declared by manufacturer based on category (e.g., NPD - No Performance Determined, or a specific value) | BS EN 771-1 |
| Strength Classification System | Designated by discrete strength classes (e.g., Class 400, 450) | Declared mean compressive strength by manufacturer (any value, tested for conformity) | BS EN 771-1 |