Concrete sensor for sensing fresh concrete

Details Concrete sensor for sensing fresh concrete Concrete sensor for sensing fresh concrete

1992-06-18

1993-08-24

Wieder, Kenneth A.

Electricity: measuring and testing

Electrolyte properties

324 711, 324693, 204422, G01N 2730

Patent

active

052392686

ABSTRACT:
A sensor for use during the construction of a concrete structure to enable an assessment to be made of whether or not a pour of fresh concrete has settled uniformly throughout the placement area. One of two main electrodes is fitted with an auxiliary electrode in parallel such that the polarity of the electrodes is reversed when they are immersed in water and when they are immersed in fresh concrete. By monitoring this function, it is possible to detect the presence or absence of fresh concrete in accordance with the polarity. In the case of a sensor without an auxiliary electrode, it is still possible to monitor changes in the voltage level when the electrodes are immersed in water and in fresh concrete, thereby providing access to a similar mode of assessment.

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patent: 4120166 (1978-10-01), Brooks
patent: 4927503 (1990-05-01), Polly
patent: 4942354 (1990-07-01), Miller

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