Construction Material: Aggregate Quality Test (Field + Lab Guide) 🪨

Aggregate (coarse + fine) concrete ka major part hota hai. Total concrete volume ka lagbhag 70–75% aggregate hota hai, isliye iska quality check karna bahut zaroori hai.

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1. Sieve Analysis (Grading Test)

Is test se pata chalta hai ki aggregate ka size distribution sahi hai ya nahi.

• Different sieve sizes use kiye jaate hain
• Material ko sieves se pass karte hain
• Percentage passing calculate kiya jata hai

Importance: Proper grading se concrete strong aur workable hota hai.

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2. Flakiness Index (Shape Test)

Ye test check karta hai ki aggregate flat (patla) toh nahi hai.

• Flat particles weak hote hain
• Concrete strength reduce karte hain

Limit: Generally < 25% acceptable

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3. Elongation Index

Ye test check karta hai ki aggregate lambe (elongated) toh nahi hain.

• Lambe particles load properly transfer nahi karte

Limit: Generally < 15% acceptable

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4. Impact Value Test

Aggregate ki toughness check karta hai.

• Impact load mein tootne ki capacity check hoti hai

Limit: < 30% for good quality

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5. Water Absorption Test

Aggregate kitna paani absorb karta hai ye check hota hai.

• High absorption = poor quality

Limit: < 2% recommended

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📊 Quick Aggregate Checklist

Test	Requirement
Grading	As per IS standards
Flakiness	< 25%
Elongation	< 15%
Impact Value	< 30%
Water Absorption	< 2%

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🎯 Conclusion

Aggregate quality directly concrete strength ko affect karti hai. Isliye site par use karne se pehle proper testing zaroor karein.

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💬 Aapka Sawal

Kya aap site par sieve analysis karte hain ya lab par depend karte hain? Comment mein batayein.