It has been noted that densified microsilica provides better corrosion protection to the
rebars than the undensified one. Also, its protective effect appears to be dependent
upon the type of cement and corrosive environment. In seawater, blending of
microsilica with SRC suppresses the corrosion of rebars more than that of microsilica
blended with OPC. An attempt has been made to explain the mechanism of corrosion
provided by microsilica.