Gauge length selection
For heterogeneous materials, gauge length must be enough to average strrain. As concrete consists of cement and aggregates (gravel and sand), the average material evaluation for concrete needs the use of strain gauges with 3 times larger gauge length than the aggregate.
According to testing conditions (3 types)
| Testing conditions | Applicable gauges | Adhesive |
|---|---|---|
| Immediate measurement in room | PF,P Series & integral leadwire type |
CN,CN-E,P-2 |
| Outdoor measurement after some time lapse | PF,P Series & integral leadwire type |
RP-2 |
| Long-term outdoor measurement | FLM / WFLM Series & waterproofed and integral leadwire type |
PS |
