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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Parameters Affecting the Measurements of Embedded Electrical Sensors for Concrete Health Monitoring Applications
Author(s): F. Rajabipour and J. Weiss
Publication: Special Publication
Appears on pages(s): 7-22
Keywords: corrosion; durability; electrical measurement; health monitoring; sensor
Abstract:Traditional methods of condition assessment frequently rely on manual inspections of a structure to locate signs of aging and deterioration. In comparison, the sensor-based health monitoring shows several advantages including increased accuracy and frequency of the measurements, possibility of remote sensing, and ability to determine the rate of damage and remaining life of a structure. Although the embedded electrical sensors provide valuable measurements enabling
prediction of concrete durability, proper calibration of the measurements is essential. As an example,
the electrical conductivity measurements of concrete are shown to be simultaneously influenced by
four parameters: (a) concrete microstructure, (b) pore fluid composition, (c) moisture content, and (d)
temperature. Experimental evidence is provided suggesting that the sensor measurements must be
calibrated to account for these parameters; otherwise, the results can be misleading. A combination
of several sensors can provide the information needed for proper calibration of the measurements. Several sensors have been developed to monitor the durability of concrete. Among these, a series of electrical/electro-chemical sensors have been recently introduced that enable measuring the transport properties of concrete as well as monitoring the corrosion process of the reinforcing steel. In his paper, several types of such electrical sensors are introduced and the theoretical background behind each measurement is discussed. For example, it is shown that measurement of the electrical conductivity of concrete can be used to estimate the permeability, ion diffusivity, or moisture content of concrete.
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