🧪 Aggregate Impact Value Test (AIV) – Complete Practical Guide for Site Engineers
Introduction
Aggregate Impact Value (AIV) Test road construction में एक महत्वपूर्ण test है, जिससे aggregates की impact resistance (shock resistance) check की जाती है।
👉 “Traffic load और impact को aggregate कितना सह सकता है – यह AIV test बताता है”
यह test highways और heavy traffic roads के लिए बहुत जरूरी है।
What is Aggregate Impact Value Test?
यह test measure करता है:
👉 Aggregate impact (shock load) को कितना resist कर सकता है
क्यों जरूरी है AIV Test?
Road durability check करने के लिए
Aggregate toughness measure करने के लिए
Impact resistance सुनिश्चित करने के लिए
Required Equipment
Impact Testing Machine
Cylindrical Cup
Tamping Rod
Sieves (2.36 mm)
Balance
Sample Preparation
10–12.5 mm aggregate use करें
Dry sample लें
Step-by-Step Procedure
1. Filling the Cup
Cup में aggregate भरें
Tamping rod से compact करें
2. Impact Loading
Hammer को fixed height से गिराएं
Standard number of blows दें
3. Sieving
Sample को sieve करें
Fine particles collect करें
Calculation
AIV (%) = (Weight of fines / Total weight) × 100
Standard Values
| Road Type | AIV Limit |
|---|---|
| Wearing Course | < 30% |
| Base Course | < 45% |
Interpretation
Low AIV → Strong aggregate
High AIV → Weak aggregate
Importance in Road Construction
Impact resistance ensure करता है
Heavy traffic performance improve करता है
Common Mistakes
❌ गलत sample size
❌ Improper tamping
❌ Hammer height गलत
Site Engineer Responsibilities
सही aggregate approve करना
Lab results verify करना
Quality maintain करना
Practical Tips
✔ Dry sample use करें
✔ Accurate weight लें
✔ Repeat test for accuracy
Conclusion
Aggregate Impact Value Test road construction quality control का essential test है। यह सुनिश्चित करता है कि aggregates impact load सह सकते हैं।
Final Words
👉 “Low Impact Value = Strong & Durable Road” 🪨🚧