The Vibrating Wire Rebar and Sisterbar Strain Gauge is fixed axially inside a short, central length of round steel bar. This central section is de-bonded from the surrounding concrete by means of a plastic coating, and is extended by welding a length of rebar to each end. Rebar Strain Gauges are welded into the reinforcing cage and must be matched to the size and grade of the rebar forming the cage...
slurry walls, caissons and for casting in place concrete piles.
Description
The Vibrating Wire Rebar and Sisterbar Strain Gauge is fixed axially inside a short, central length of round steel bar. This central section is de-bonded from the surrounding concrete by means of a plastic coating, and is extended by welding a length of rebar to each end.
Rebar Strain Gauges are welded into the reinforcing cage and must be matched to the size and grade of the rebar forming the cage.Sister Bars are installed alongside existing lengths of rebar withinthe cage. Both types of strain gauge are extremely robust, reliable and waterproof.The gauges can be read individually or remotely as part of a data collection system. A factory fitted, four core screened cable connects the coil to the readout unit. A thermistor to measure temperature changes can be included in the Rebar and Sisterbar Strain Gauge sensors.
Waterproof: Customized 1, 2, 3MPa
The Rebar Strain Gauge is installed by welding the gauge into the rebar cage at a location within the structure suitable to accurately pass loads from the cured concrete into the gauge.Sisterbars (of 12mm diameter) are installed alongside existing lengths of rebar within the cage. Rebar Strain Gauges and Sisterbars are usually installed in pairs within the structure on either side of the neutral axis, so that bending movements can be separated from axial loads.
