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Carlson Stress Cell
CARLSON Stress Cells are plates with a strain-meter sensing element mounted on one face.
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The 178mm diameter plate has a mercury film at its thickest and a flexible rim, with the result that any stress through the plate is applied to the mercury film.
Extraneous deformation such as drying shrinkage has very little effect on stress through the plate (and the mercury) so the calibration is in terms of compressive stress per 0.01 per cent reduction in the resistance ratio of the sensing element. Available for both soil and concrete.
