https://hal-cea.archives-ouvertes.fr/cea-02386098Bajja, ZinebZinebBajjaDridi, W.W.DridiLarbi, BouthainaBouthainaLarbiLe Bescop, PatrickPatrickLe BescopCEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) - CEA - Commissariat à l'énergie atomique et aux énergies alternativesThe validity of the formation factor concept from through-out diffusion tests on Portland cement mortarsHAL CCSD2015DiffusionMortarsCementMicrostructureFormation factor[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th][PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex]amplexor, amplexor2019-11-29 10:49:102020-04-28 11:28:142019-11-29 10:49:10enJournal articles10.1016/j.cemconcomp.2015.07.0141The diffusion coefficients of ions and radionuclides in cementitious materials are the basic parameters to evaluate the state of the degradation of structures. In this article, three different tracers (two ions, and a radionuclide) were tested on the same formulations of mortars (sand volume fractions from 0 to 60 per cent) in terms of the through-out diffusion, to determine the effective diffusion coefficients of each tracer and each formulation. The aim of this study is to prove the validity of the formation factor equation relating the effective diffusivity of a tracer in cementitious material to its diffusion coefficient in pure water. This result is extremely interesting because once the geometric formation factor of a material is known, it is possible to determine the values of the effective diffusion coefficients of any other diffusing species in this material.