Truong Son Bui1, Duc Tho Pham This email address is being protected from spambots. You need JavaScript enabled to view it.1, Minh Ngoc Vu2, Van Duc Bui1, Nam Hung Tran3, and Thi Nu Nguyen1

1Hanoi University of Mining and Geology, Hanoi, Viet Nam
2Duy Tan University, Da Nang, Viet Nam
3Le Quy Don Technical University, Hanoi, Viet Nam


Received: December 22, 2020
Accepted: May 3, 2021
Publication Date: July 9, 2021

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Chloride ions penetrated into reinforced concrete member causes rebar corrosion and induces the volume expansion of the rebar and cracks of concrete cover. This study aims to predict the chloride ingress in the reinforced concrete member and its operational service life by using a lattice model. Concrete is considered at the mesoscale, which constitutes three phases: aggregates, cement matrix and interfacial transition zones (ITZ). Fick’s second law was implemented into the lattice model to describe the diffusion of the chloride ions within concrete. The diffusivity coefficient of aggregates is almost null, whereas those of cement paste and of ITZ are deduced from macroscopic diffusivity measure. Numerical solutions is validated against the test data and the analytical solution. The effect of the aggregate volume fraction is discussed. Curves, which help to determine the service life of the reinforced concrete structure from the cover thickness, is resulted from the lattice modelling for concrete with different aggregate volume fractions.

Keywords: Chloride diffusion, Concrete, Mesoscale, Lattice model, service life, cover thickness


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