IS 9375:1979 is the Indian Standard (BIS) for precast reinforced concrete plant guards. This standard specifies the material, dimensional, and strength requirements for precast reinforced concrete plant guards, which are used to protect young trees and plants. It covers aspects like concrete grade, reinforcement details, manufacturing tolerances, and testing procedures to ensure product quality and durability.
precast reinforced concrete plant guards
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Minimum Concrete Compressive Strength | M15 Grade (15 N/mm² characteristic cube strength) | Typically C25/30 (25 N/mm² characteristic cylinder strength) or higher based on exposure. | BS EN 12839:2012 (ref. EN 206) |
| Minimum Cement Content | 300 kg/m³ | Dependent on exposure class and aggregate size, e.g., ~280-300 kg/m³ for moderate exposure (XC3/XC4). | BS EN 13369:2018 (ref. EN 206) |
| Maximum Water-Cement Ratio | 0.55 | Dependent on exposure class, e.g., ≤ 0.60 for XC2, ≤ 0.55 for XC3. | BS EN 13369:2018 (ref. EN 206) |
| Minimum Cover to Reinforcement | 15 mm | Varies by exposure class; typically ≥ 20-25 mm for moderate external conditions. | BS EN 12839:2012 (ref. EN 1992-1-1) |
| Strength Test Requirement | Transverse test: support a 40 kg central load over a 1m span without cracking. | Bending strength test with results declared based on performance classes (e.g., minimum bending moment). | BS EN 12839:2012 |
| Curing Method | Immersion in water for not less than 7 days. | Specifies achieving a certain percentage of concrete strength before demoulding/handling, allowing various methods (steam, membrane, water). | BS EN 13369:2018 |