Numerical and experimental analysis of chloride and iodide transports in concrete under natural diffusion
Artikel i vetenskaplig tidskrift, 2023

This study investigates the natural diffusion laws of chloride ions and iodide ions in concrete and proposes their correlations during the process of diffusion. By measuring the free ion concentration at different exposure times and diffusion depths, time-varying laws related to the ion diffusion coefficient D and surface ion concentration Cs were proposed. The linear proportional relationship between two kinds of ions is explored and fills the relevant research gaps. Natural diffusion models of ions are established via the finite element software COMSOL and the adjustment parameters K and λ are innovatively proposed. Thus, this enables the effective conversion of the ion resistance permeability coefficients measured by the RCM and RIM methods, especially for the concrete containing chloride. The results of numerical calculation and experimental measurement have a strong correlation. Furthermore, a two-dimensional concrete model with different aggregates is used to simulate the ion diffusion characteristics. It is confirmed that the increase in aggregate volume ratio and tortuosity inhibited ion diffusion, and the ion concentration in the local area was greatly reduced.

Concrete

Random aggregate model

Numerical analysis

Ionic transport

Chloride and iodide diffusion

Författare

Chenyue Liao

Shenzhen University

Hesong Jin

Shenzhen University

W. Liu

Shenzhen University

Jun Liu

Shenzhen University

Shen Zhong

Shenzhen University

F. Xing

Shenzhen University

Luping Tang

Chalmers, Arkitektur och samhällsbyggnadsteknik, Byggnadsteknologi

Construction and Building Materials

0950-0618 (ISSN)

Vol. 392 131902

Ämneskategorier

Samhällsbyggnadsteknik

DOI

10.1016/j.conbuildmat.2023.131902

Mer information

Senast uppdaterat

2023-07-10