Requirements and possible simplifications for multi-ionic transport models - Case of concrete subjected to wetting-drying cycles in marine environment

摘要

In this paper, a physically and chemically based model, which describes coupled ion-moisture transport, is used to simulate chloride ingress in concrete elements subjected to wetting-drying cycles in marine environment. Various assumptions are tested, in order to quantify the influence of taking into account dissolution/precipitation kinetics or to underline the differences between complex model and very simple one assuming saturated conditions in the latter case. Numerical simulations are compared to experimental chloride concentration profiles. Experimental data were obtained on OPC concrete (w/c = 0.43) specimens exposed to 6 h/6 h seawater wetting-drying cycles in lab (where RH and T are controlled).