Construction materials testing
Aggregate Impact Value Tester
A drop-hammer machine that strikes a cup of coarse aggregate 15 times and measures how much it breaks into fines. The result, the aggregate impact value (AIV), shows the aggregate's toughness.
- Construction materials testing
- Road and highway construction
- Quarries and crushers
- Ready-mix concrete
- Academic labs
TROUBLESHOOTING
Common problems, causes and fixes
AIV lower than expected for a known aggregate
Likely causes
- • Hammer friction in guides
- • Drop height too low
- • Machine not firmly bedded
What to do
- • Clean and lubricate guides
- • Reset drop height
- • Bed the base on a solid floor
Duplicate results differ widely
Likely causes
- • Uneven compaction
- • Sample not representative
- • Inconsistent sieving
What to do
- • Standardise tamping
- • Split samples properly
- • Sieve to a consistent end point
Mass loss during test
Likely causes
- • Fragments thrown out of the cup
- • Fines lost while sieving
What to do
- • Check cup fit and guard
- • Sieve over a pan and brush the sieve
In LimsPulse · Calibration Management
Keep every AIV tester in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.