Here is a concise and complete summary of Water Quality Requirements as per IS:456:2000, useful for notes, teaching, or video content.

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💧 Water Quality Requirements as per IS:456:2000

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📘 Clause Reference:

IS:456:2000 – Clause 5.4: Water

“Water used for mixing and curing shall be clean and free from harmful amounts of oils, acids, alkalis, salts, sugar, organic materials or other substances that may be deleterious to concrete or steel.”

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✅ Permissible Limits of Impurities

Substance	Max Permissible Limit	Effect
pH value	Not less than 6.0	Controls acidity
Suspended matter	2000 mg/l	Affects strength
Inorganic solids	3000 mg/l	May hinder cement hydration
Organic materials	200 mg/l	May weaken concrete matrix
Sulphates (as SO₄)	400 mg/l	Can cause expansion & cracking
Chlorides (as Cl⁻)	Plain Concrete – 200 mg/l
RCC – 500 mg/l	Causes corrosion in steel reinforcement
Sugar	Max 0.05%	Retards setting of cement

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⚠️ Special Considerations

• Seawater: ❌ Not allowed for reinforced concrete due to high chloride content.

• Curing Water: Should also be free from harmful impurities that could leave stains or damage the surface.

• Doubtful Water: Must be tested before use.

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🧪 Field Rule of Thumb

If water is fit for drinking, it is generally fit for concrete use.

But for large projects or questionable sources – test the water in a lab following IS:3025 or IS:456 Appendix-A.

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🏗️ Why Water Quality Matters

• Poor-quality water leads to:

  • 🌫️ Loss of strength

  • ⚙️ Poor durability

  • 🔩 Corrosion of steel

  • 🧱 Structural failure over time

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✅ Summary Checklist

✔ pH ≥ 6
✔ Low salt & organic content
✔ No visible oil or floating material
✔ Clean water for both mixing and curing

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📘 Always follow IS:456:2000 Clause 5.4 to ensure long-lasting, high-strength, and safe concrete structures.

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