How are TIP™ measurements used to compute the effective radius?

The known total volume of concrete actually placed in the shaft is used to compute an overall average radius (since the shaft length is known) and this average radius is equated to the average measured temperature of all Thermal Wire® cables or tubes over the entire length of shaft (excluding end condition effects – see Q 1092 ). Variations in the temperature along the shaft can then be transformed to radius changes by this ratio since the temperature gradient is nearly linear near the cage.

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