Dielectric Response (1 MHz-1.8 GHz) of an Aluminous Cement at the Early Age as a Function of Setting Time

摘要

Electrical measurements as a function of frequency are an experimental approach which is used to characterise the response of ceramic materials. One of the methods reported in the literature is based on impedance spectroscopy, usually in the Hz-MHz range. For a typical ceramic which consists of grains separated by grain boundaries, coated with electrodes, this technique permits assessments of the various contributions to the global electrical response of the tested material. High frequency measurements (1 MHz-1.8 GHz) have been successfully carried out to characterise the solid-liquid interfaces in concentrated ceramic suspensions. In this paper, we discuss electrical behaviour in the 1 MHz-1.8 GHz range of aluminous cement samples at early hydration ages from a few minutes to a few hours after mixing.