MODELLING OF CHLORIDE TRANSPORT IN UNSATURATED CONCRETE: STUDY OF ELECTROCAPILLARY EFFECT

Author(s): Phu Tho Nguyen, Ouali Amiri
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-170-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 238-246
Total Pages: 9
Language : English

Abstract: In this paper a multispecies transfer model is used to simulate the chloride profile in
unsaturated concrete. Particularly, this model takes into account the electrical double layer
(EDL) occurring at the interface between a pore wall and a pore solution. The obtained
numerical simulations show that the chloride profile is mainly affected by the two main
parameters of EDL i.e: the zeta potential and the pore diameter. The overlapping of EDL
occurs when the pore diameter is smaller than 3nm and the zeta potential is around 30mV.
The simulations also show that the composition of concrete affects the evolution of the
chloride profile. Among the tested concretes, the one containing slag shows an overlapping of
EDL greater than ordinary Portland concrete or concrete made with fly ash. This result could
be explained by the ferrous ions of slag which affect the ionic strength of the pore solution as
well as by the finer pore size distribution of such materials.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00