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6
4.1 Direct Attachment to Rebar
1) Place two pieces of wood or Styrofoam between the gage and the rebar as shown in Figure 7.
2) Select a length of soft iron tie wire, similar to the kind that is normally used for tying rebar
cages together. Run the wire around the body of the strain gage and around the rebar. Then
twist the wire around itself to hold the gage in place.
3) Tie the instrument cable off to the rebar using nylon cable ties.
The wires should not be tied too tightly since rebar and tension cables tend to move during
concrete placement and vibration. Care should be taken not to damage the cable with the
vibrator. The gage can also be placed directly into the mix if it can be assured that the orientation
will be correct after the gage placement.
Figure 7 - Attaching Model 4200/4200L/4200HT Strain Gages to Rebar
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