http://mit.imt.si/Revija/izvodi/mit195/xiao.pdf

Abstract

Blended cements might change the chemistry of the pore solution and subsequently affect the corrosion of steel in concrete. Pore solutions were extracted, analyzed and compared from mortars made of CEM I, CEM II, CEM III and CEM IV cements. Three combinations of carbonation and chloride states were studied, i.e., non-carbonated without chlorides, non-carbonated with chlorides and carbonated with chlorides. Different electrochemical and spectroscopic techniques were used to study the electrochemical properties, the type and the extent of the corrosion products, as well as the type and the extent of the corrosion damage. It was confirmed that the most corrosive environments were pore solutions extracted from the carbonated mortars with chlorides. In this environment the highest corrosion rate was observed for the CEM III pore solution, and the lowest for the CEM I. The extent and the type of corrosion products and the corrosion damage varied according to the environment.

Corrosion behavior of steel in pore solutions extracted from different blended cements

“…Various experiments in pore water have been carried out to explain the differences in corrosion behavior of steel in specific blended cements. [ 14–22 ] Most of them have been conducted using simulated pore solutions, [ 14,15,18,20,21 ] with the number of measurements in extracted pore solutions being fairly low. [ 22 ]…”