2019 Volume 68 Issue 10 Pages 270-273
An electrochemical impedance measurement of mortar specimen was performed to investigate the relationship between the impedance spectrum and the pore structure in mortar. The mortar specimens with different pore size were prepared for the impedance measurement. The capacitive loop or part of loop, which are related to the physical properties of mortar, were observed in the impedance spectra of mortar specimens. The mortar resistance between the pores and the capacitance between pores filled with solution in mortar specimen(RMpore and CMpore)were estimated by curve-fitting of impedance spectrum using an equivalent circuit. The values of RMpore and CMpore were increased and decreased, respectively, when the size of pores became smaller in mortar specimens. These results imply the decreasing the water pathway of pores in mortar due to the increasing small pores in mortar.