Aggregate Impact Value (AIV) — Lab Manual

Objective & standard

Toughness of coarse aggregate against sudden impact.

Standard: BS 812-112

Apparatus

• AIV machine 13.5–14 kg hammer, 380 mm drop
• Cup 102 mm dia.
• Sieves 14, 10 and 2.36 mm
• Tamping rod, balance

Procedure

1. Take aggregate passing 14 mm and retained on 10 mm, oven dry.
2. Fill the measure in 3 layers × 25 tamps; weigh (A).
3. Place in the cup and give 15 blows.
4. Sieve on 2.36 mm and weigh the fines passing (B).
5. Average two tests.

Calculations

• AIV = B ÷ A × 100

Typical values: ≤ 10 % exceptionally strong, 10–20 % strong, 20–30 % satisfactory; wearing course ≤ 30 %.

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Data sheet (print this page)

Project: ____________________   Sample: __________   Date: __________   Tested by: __________

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