The behaviour of the blended cements containing limestone filler exposed to corosive environment is important for the durability of the concretes made with such of binders. The paper brings information regarding the behaviour of some blended cements containing Portland cement with 10-40% limestone filler additions in contact with a 5% MgCl2 solution.
The interaction processes between the binding matrices and MgCl2 solution were assessed by XRD analysis and scanning electron microscopy (SEM). New types of hydrates are formed as a result of these processes.
The interaction processes take place gradually from the surface of the samples to their inside, and determines compositional and structural differences between the two zones.
The changes determined by the chemical processes in the composition of the mortar samples in contact with MgCl2 solution have negative concequences on their mechanical strengths, more important after longer periods of time. The behaviour of the blended cement containing 10% limestone filler exposed to MgCl2 solution is similarly to those of Portland cement.