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Title

Modeling the transport of multiple corrosive chemicals in concrete structures: Synergetic effect study
Authors

Ming-Te Liang
Organization: National Taiwan Ocean University
Shieng-Min Lin
Organization: National Taiwan Ocean University
Journal / Anthology

Cement and Concrete Research
Year: 2003
Volume: 33
Page range: 1917-1924
Description

The synergetic effect of multiple corrosive chemicals in concrete structures has been investigated using a mathematical model with a set of one-dimensional linear diffusion equation that belongs to the equation of continuity. Combining the method of Laplace transform with the substitution method, and using the convolution theorem, the analytical solution of the one-dimensional linear diffusion equation can be solved. Based on the equation of continuity and the reduction of corrosive chemical concentration through the mechanical driving force with second-order kinetics, a system of transport equations may be employed to elucidate the synergetic effect of two contaminants such as Cl− and CO2, Cl−, and SO2/4−, and CO2 and SO2/4−. The computer package "Mathematica" was used to show the synergetic effect of multiple corrosive chemicals in concrete structures. The numerical results of concrete structure subjected to multiple corrosive chemicals shed some light on the synergistic behavior of Cl− and CO2, Cl−, and SO2/4−, and CO2 and SO2/4− versus their individual behavior. These results prove that the proposed model may really describe the synergetic effect of multiple corrosive chemicals in concrete structures. However, it is still recommended that experiments should be performed to choose suitable parameters for numerical simulations.
Subject

*Science > Chemistry
Keywords

Carbon dioxide, Chloride ion, Corrosion, Sulfate ion, Synergetic effect