Time-Dependent Chloride Binding Capacity of Various Types of Cement Pastes

The aim of this paper is to investigate the time-dependent chloride binding capacity of various types of cement pastes. Three types of cement (type I, III and V) were used in this study. Cement paste specimens with different water to cement ratio, cement types, curing times and chloride exposure periods were tested. From the experimental results, the chloride binding capacity of cement paste exhibits time- dependent. It depends on the curing time prior to chloride attack and exposure period in chloride solution. Cement pastes having longer age prior to chloride exposure bind less amount of chloride than those exposed at the earlier age. Longer exposure period of paste results in larger content of bound chloride. Moreover, the chloride binding capacity also depends upon other factors, such as water to cement ratios and cement types. Higher water to cement ratio results in smaller amount of bound chloride than the lower one does. Type V cement binds less, but type III cement binds more amount of chloride than type I cement does.