Concrete and mortar surface strain measurement

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
Outdoor measurement after some time lapse PF,P Series
& integral leadwire type
Long-term outdoor measurement FLM / WFLM Series
& waterproofed and integral leadwire type