Abstract
In this study, the chloride profile of cement mortar with various supplementary cementitious materials after 100 d immersion in 5% NaCl solution was characterized by electron probe microanalysis (EPMA), mortar powder extraction, and AgNO3 colorimetric methods. The results show that the EPMA determined chloride profile is very close to the acid-soluble chloride content while the water-soluble chloride content is 0.71 times that of EPMA determined. It is found that the chloride penetration depth determined by AgNO3 solution is affected by the concentration of AgNO3. The high AgNO3 results in low measured chloride penetration depth. The chloride content at the color boundary determined by 0.1 M AgNO3 solution is 1.39 times that of the result obtained from 0.035 M AgNO3 solution. Due to the retention effect by bound chloride, the apparent chloride diffusivity determined by water-soluble chloride content is higher than that of EPMA and acid-soluble chloride determined diffusivities. This work can be used to broaden the understanding in chloride transportation and determination method of the community.
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