TY - JOUR
T1 - Measuring the effect of the ITZ on the transport related properties of mortar using electrochemical impedance
AU - Lizarazo-Marriagaa, J.
AU - Higuera, C.
AU - Claisse, Peter A.
PY - 2014
Y1 - 2014
N2 - In this paper, electrochemical Impedance spectroscopy (EIS) is used to investigate the effect of the interfacial transition zone (ITZ) on the transport related properties of Portland cement mortars. The ITZ between the cement paste and the aggregate provides a significant pathway for chloride transport which causes corrosion of reinforcing steel. The EIS experiments were used to determine how transport properties are influenced by the microstructure. The compressive strength, capillary porosity, chloride migration and impedance were measured on several mortar mixes which had different aggregate sizes at a constant aggregate fraction. An equivalent circuit model was fitted to experimental impedance spectra in order to obtain the electrical properties from the EIS results. The parameters of the equivalent circuit (resistances and capacitances) were correlated to physical conditions of the material microstructure. The results showed a clear relationship between the physical transport properties and the modelled equivalent circuit elements. This provides an explanation for the electrical impedance of mortar along conductive and non-conductive paths.
AB - In this paper, electrochemical Impedance spectroscopy (EIS) is used to investigate the effect of the interfacial transition zone (ITZ) on the transport related properties of Portland cement mortars. The ITZ between the cement paste and the aggregate provides a significant pathway for chloride transport which causes corrosion of reinforcing steel. The EIS experiments were used to determine how transport properties are influenced by the microstructure. The compressive strength, capillary porosity, chloride migration and impedance were measured on several mortar mixes which had different aggregate sizes at a constant aggregate fraction. An equivalent circuit model was fitted to experimental impedance spectra in order to obtain the electrical properties from the EIS results. The parameters of the equivalent circuit (resistances and capacitances) were correlated to physical conditions of the material microstructure. The results showed a clear relationship between the physical transport properties and the modelled equivalent circuit elements. This provides an explanation for the electrical impedance of mortar along conductive and non-conductive paths.
KW - interfacial transition zone
KW - transport properties
KW - electrical impedance spectroscopy
U2 - 10.1016/j.conbuildmat.2013.10.077
DO - 10.1016/j.conbuildmat.2013.10.077
M3 - Article
SN - 0950-0618
SN - 1879-0526
VL - 52
SP - 9
EP - 16
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -