T. Ishida, K. Maekawa and M.Soltani
Journal of Advanced Concrete Technology,
2(2) 213222, 2004
In order to predict the chemophysical process of carbonation,
a finite element based computational method is implemented based upon multiphase/scale
governing equations of moisture and flux of both heat and carbon dioxide. Influencing
parameters of carbonation involving reaction rate, CO_{2} diffusivity and
the reduction of porosity are discussed. It is found that such modeling can accurately
show high nonlinearity among carbonation reaction, pore structure development and
moisture distribution in micropore structures. By using the proposed assumptions,
the reliability of the predictive method of the carbonation mechanism in cementitious
materials under arbitrary environmental and curing conditions is examined by comparing
available experimental results with theoretical ones. Through sensitivity analyses
that focus on the nonlinearity of the moisture profile and local carbonation, it
is clarified that different moisture distribution may bring the opposite trend of
the carbonation depth under low and high CO_{2} concentrations.
