Use Of Impedance Spectroscopy To Determine
The Displacement Of Water In Cement Paste
Under Small Loads
Author(s)
I. Sánchez, G. Castro, M. A. Climent & X. R. Nóvoa
Abstract
The effect of mechanical loading in concrete structures may cause deformation
by creeping. The physical origin of this phenomenon is not well known, but
water seems to play an essential role in it. Impedance spectroscopy in the high
frequency region can detect water movements towards empty pores, even when
the applied load is small. In this paper a system for application of mechanical
loading compatible with simultaneous impedance spectroscopy measurements is
presented. The effect of several parameters (ageing, water to cement ratio, water
content) on cement paste samples’ performance under mechanical loading is
analysed through the corresponding impedance spectra.
Keywords: impedance spectroscopy, cement paste, microstructure, dielectric
properties, mechanical loading.
1 Introduction
Real concrete structures are designed to be mechanically loaded. The effect of
the deformation of a structure under a constant load is called creeping and is a
classical phenomenon well described in the literature [1, 2]. This effect has a
great dependency on some factors such as temperature and relative humidity
[1, 3]. The microstructural mechanism that leads to the effect of creeping is still
not well known, although water plays an essential role in almost every theory on
Keywords
impedance spectroscopy, cement paste, microstructure, dielectric
properties, mechanical loading.
Related Book
Other papers in this volume
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