MULTI-SCALE MODELING OF THE EVOLUTION OF THE TRANSPORT PROPERTIES OF CEMENT PASTES SUBJECT TO LEACHING AND CARBONATION
The long-term management of radioactive waste is a very broad field of research from which rise different problems and uncertainties.In many of international projects, concrete constitutes one of the main barrier against the migration of the radionuclides towards the biosphere.Under the repository conditions, the cementitious materials will encounter physicochemical attacks,notably from the infiltrating water.This will have an impact on their microstructures and transport properties, potentially compromising their safety functions.To assess the performances of the cementitious materials, reactive transport codes (such as Hytec) are used.Those models use Archies empirical law to model the feedback of porosity changes on the transport properties.However, Archies law is inappropriate for cementitious materials, which exhibit a pretty unique pore structure extending from the nanopores of the Calcium Silicate Hydrates (C-S-H) gel to the micrometric capillary pores.In order to obtain a better general feedback relation applicable to cementitious materials, an intensive series of dedicated experiments focused on the leaching and the carbonation of pure C-S-H and of mixtures of C-S-H with Portlandite are currently in progress.The experimental campaign is described.Some preliminary results are also presented, consisting of Monte Carlo and homogenization simulations.
N.Seigneur A.Dubus P.E.Labeau V.Detilleux O.Destin A.Dauzères
Universite Libre de Bruxelles,Belgium Bel V,Belgium IRSN,France
国际会议
The Fourth RILEM International Symposium on Concrete Modelling (CONMOD 2014)(第四届RILEM混凝土材料建模国际会议)
北京
英文
367-373
2014-10-12（万方平台首次上网日期，不代表论文的发表时间）