IS 9845:2006 is the Indian Standard (BIS) for determination of aggregate impact value. IS 9845 provides the aggregate impact value (AIV) test — a quick field test for aggregate toughness. AIV = percentage of fines passing 2.36mm sieve after 15 standard blows. Lower AIV = tougher aggregate. Critical for road and pavement aggregate selection.
Method of test for determining the aggregate impact value (AIV) which gives a relative measure of the resistance of aggregate to sudden shock or impact.
Overview
Status Current
Usage level Frequently Used
Domain Materials Science — Aggregates and Sand
Type Testing Method International equivalents
Also on InfraLens for IS 9845
Practical Notes
! AIV < 30% is required for road wearing course aggregates per IRC specifications.
! This is a quick test (15 minutes) and can be done on site with portable equipment.
! AIV and crushing value (IS 9376) together give a good picture of aggregate strength.
! Wet AIV is also tested — if wet AIV > 1.25 × dry AIV, the aggregate is moisture-sensitive.
Frequently referenced clauses
Cl. 3 — Apparatus (impact testing machine, cylindrical cup)
Cl. 4 — Sample preparation (10-12.5mm fraction)
Cl. 5 — Test procedure (15 blows)
Cl. 6 — Calculation of AIV
aggregate impact AIV aggregate testing road aggregate impact resistance
International Equivalents Similar International Standards
BS 812-112:1990 BSI (UK)
High Current
Testing aggregates — Method for determination of aggregate impact value (AIV)
IS 9845 is adopted from BS 812-112. Test procedure is identical.
Key Differences
≠ IS 9845 is adopted from BS 812-112. The test is not commonly used in US (ASTM uses Los Angeles abrasion instead).
Key Similarities
≈ Identical test procedure — 15 blows on 10-12.5mm aggregate, measure passing 2.36mm.
Parameter Comparison
Parameter IS Value International Source
⚠ Verify details from original standards before use Report Error
Key Values5 Quick Reference Values
Max AIV for wearing course 30%
Max AIV for concrete aggregate 45%
Number of blows 15
Sample size 10-12.5mm fraction
Passing sieve 2.36mm
Key Formulas
AIV (%) = (Weight passing 2.36mm / Original weight) × 100
Tables & Referenced Sections Frequently Asked Questions1 What is a good aggregate impact value? + <20% = exceptionally strong (basalt, granite). 20-30% = satisfactory for road wearing course. 30-45% = acceptable for concrete but not for road surface. >45% = weak, reject.
QA/QC Inspection Templates 📋
QA/QC templates coming soon for this code.