Firstly, the total concentrations of chlorides at the AgNO3 colour change boundary are determined in mortars with different binders. Then, the DRCM obtained from the basic model is compared to the one derived from the extended model. Furthermore, the apparent chloride diffusion coefficient obtained in long-term immersion test is estimated in order to demonstrate the influence of blended cements on the chloride transport properties of mortars and the RCM test reliability.