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🪨 Aggregate Crushing Value Test – Complete Practical Guide for Site Engineers (Step-by-Step + Quality Control)
Introduction
Aggregate Crushing Value (ACV) Test road construction और concrete work में बहुत important test है, जिससे aggregates की strength और resistance to crushing check की जाती है।
👉 “Weak aggregate = Weak road”
इस article में हम ACV test को practical site + lab level पर step-by-step समझेंगे।
What is Aggregate Crushing Value Test?
यह test aggregates की compressive strength check करने के लिए किया जाता है।
क्यों जरूरी है ACV Test?
Road strength ensure करने के लिए
Aggregate quality check करने के लिए
Pavement durability बढ़ाने के लिए
Required Equipment
Crushing Cylinder
Plunger
Tamping Rod
Compression Testing Machine
Sieves
Test Sample Preparation
10–12.5 mm size aggregate लें
Dry sample use करें
Proper grading करें
Step-by-Step Procedure
1. Filling the Cylinder
Cylinder में aggregate 3 layers में भरें
हर layer को tamp करें
2. Applying Load
Cylinder को CTM machine में रखें
Gradually load apply करें
3. Sieving
Crushed sample को sieve करें
Fine particles collect करें
Calculation
ACV (%) = (Weight of fines / Total weight) × 100
Standard Values
| Type of Road | ACV Limit |
|---|---|
| Wearing Course | < 30% |
| Base Course | < 45% |
Interpretation
Low ACV → Strong aggregate
High ACV → Weak aggregate
Common Mistakes
❌ Incorrect sample size
❌ Improper compaction
❌ Wrong load application
Site Engineer Responsibilities
Sample selection
Lab coordination
Result verification
Practical Tips
✔ Always dry sample use करें
✔ Correct size maintain करें
✔ Test repeat करें for accuracy
Conclusion
Aggregate Crushing Value test road construction quality control का essential part है। यह सुनिश्चित करता है कि aggregates strong हैं और load सह सकते हैं।
Final Words
👉 “Strong Aggregate = Strong Road” 🪨🚧
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