Wilson, WilliamGonthier, Julien NicolasGeorget, FabienScrivener, Karen L.2022-06-202022-06-202022-06-202022-06-0110.1016/j.cemconres.2022.106747https://infoscience.epfl.ch/handle/20.500.14299/188626WOS:000797968800005This study investigates chloride binding in blended cement pastes exposed to 0.5 M NaCl solutions (with and without pH adjustment) using X-ray diffraction and energy-dispersive X-ray spectroscopy image analysis (edxia). The aim is to better understand the effects of the binder type, the water-to-binder ratio and the pH on the chemical binding in AFm phases and the physical binding on C-A-S-H. Results show that the binding cannot be predicted from AFm and C-A-S-H contents alone because competing ions in the system affect both the Friedel's salt solid solution chemistry and the C-A-S-H binding capacity. Notably, the high content of aluminous hydrates in LC3 systems leads to a high chemical binding even if Friedel's salt solid solutions have relatively low chloride contents (particularly at a higher pH). On the contrary, the CEMIII/A paste showed low binding because of relatively high sulfate and magnesium contents which compete for incorporation/adsorption in aluminous hydrates (AFm, ettringite and hydrotalcite).Construction & Building TechnologyMaterials Science, MultidisciplinaryMaterials Scienceblended cement pasteschloride bindingfriedel ?s salt solid solutioncalcium alumina silicate hydrate (c-a-s-h)edx image analysisround-robin testfriedels saltpore solutionportlandcorrosioncalciumhydrotalcitemetakaolinconcretetext::journal::journal article::research article