Investigation of Chloride Binding Capacity of Concrete Using Different Cementitious Materials

Abstract

In this research work, the main objectives are to study the efficiency of utilizing SCMs in concrete mixes containing chlorides content higher than the allowable values listed in the Egyptian code and this was achieved by studying the chloride binding capacity of each binder type. Also, the limit of chloride content set by the code was to be investigated to determine whether it is conservative for binders except for CEM I or not, and these come through studying the chloride binding capacity of each binder with the assistance of other tests like half-cell potential test. First, the theoretical side of both the corrosion process and chloride binding capacity was discussed in the literature in addition to presenting researches discussing the rule of SCMs in such processes. Then, the experimental program of this research was presented and it can be summarized as the following: 1-Measuring the chloride binding capacity of binders used in this research (15&35% FA – 15&35% GGBFS – 5&10&15&35% MK) as a partial replacement of CEM I. 2-Pouring concrete mixes with the same previous ratios of SCMs and determining their mechanical properties (compressive and bond strength) and evaluating their corrosion behavior (half-cell potential test and accelerated corrosion test). Also, to evaluate some durability properties, tests of sorptivity, Rapid chloride penetration, pH value, and XRD were carried out.