Durable Building Technology Benefiting
Electrochemical Methods As A Preventive
Author(s)
D. A. Koleva, J. Hu & A. L. A. Fraaij
Abstract
Two series of Portland cement mortar prisms were cast with variations in
experimental set-up and chloride concentration. All samples were subject to
resistance monitoring, ion concentrations measurements and pore structure
analysis. The research reveals minor influences on mortar resistivity of changes
in chemical composition associated with ion diffusion and migration for the
investigated cases. The electrical resistivity was demonstrated to be mainly
dependent on the microstructural changes induced by hydration and chemical
binding mechanisms.
Keywords: electrical resistivity, chloride concentrations, pore structure,
concrete corrosivity.
1 Introduction
This contribution presents part of the research outcomes of a comprehensive
study on corrosion prevention and protection by electrochemical methods
(conventional and pulsed cathodic protection). The efficiency of these
electrochemical protection techniques (based on applied electrical current)
depend on, among other things, electrical resistivity of the electrochemical
system of concrete-steel-pore solution. Thus concrete resistivity and conductivity
are related to the corrosion process on one hand and the proper execution of
electrochemical protection techniques on the other. A target of this preliminary
study is to investigate the influence of ion movement (resulting from
concentration gradient) on the resistivity of cement-based porous systems in rest
conditions. This study additionally pursues to explore the morphological changes
of material microstructure, particularly of pore structure, induced by the ion
movement, ion binding and resistivity.
Keywords
electrical resistivity, chloride concentrations, pore structure,
concrete corrosivity.
Related Book
Other papers in this volume
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