Mathematical modeling and numerical study of carbonation in porous concrete materials

In this paper, a mathematical model of carbonation process in porous concrete materials is proposed. Based on physio-chemical mechanisms, the whole process can be viewed as the multi-component flow coupled the carbon dioxide-moisture-calcium ion transport. The rate of calcium hydroxide dissolution and mass equations are modified to get better descriptions on the physical conservation. An uncoupled finite volume method is proposed to solve the nonlinear parabolic system. Numerical simulations under the normal carbonation condition and the accelerated carbonation condition are presented and analyzed, respectively.

[1]  A. Razaqpur,et al.  Finite element modeling of coupled heat transfer, moisture transport and carbonation processes in concrete structures , 2004 .

[2]  X. D. Hang,et al.  Finite volume solution of heat and moisture transfer through three-dimensional textile materials , 2012 .

[3]  A. Muntean.  On the interplay between fast reaction and slow diffusion in the concrete carbonation process: a matched-asymptotics approach , 2009 .

[4]  Jay Alan Rushing,et al.  A Comparative Study of Laboratory Techniques for Measuring Capillary Pressures in Tight Gas Sands , 2004 .

[5]  G. Verbeck.  Carbonation of Hydrated Portland Cement , 1958 .

[6]  Michael Böhm,et al.  A moving-boundary problem for concrete carbonation:global existence and uniqueness of weak solutions , 2009 .

[7]  Buyang Li,et al.  Quasi-steady-state and steady-state models for heat and moisture transport in textile assemblies , 2010, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[8]  R. J. Millington,et al.  Gas Diffusion in Porous Media , 1959, Science.

[9]  R. LeVeque.  Finite Volume Methods for Hyperbolic Problems: Characteristics and Riemann Problems for Linear Hyperbolic Equations , 2002 .

[10]  A. King,et al.  A Multiphase Model for the Early Stages of the Hydration of Retarded Oilwell Cement , 2005 .

[11]  Patrick Dangla,et al.  Investigation of the Carbonation Front Shape on Cementitious Materials: Effects of the Chemical Kinetics , 2007 .

[12]  Zdeněk P. Bažant,et al.  Drying of concrete as a nonlinear diffusion problem , 1971 .

[13]  Olivier Coussy,et al.  Characterization and identification of equilibrium and transfer moisture properties for ordinary and high-performance cementitious materials , 1999 .

[14]  John M. Stockie,et al.  A model for reactive porous transport during re-wetting of hardened concrete , 2008, ArXiv.

[15]  A. King,et al.  On the initial stages of cement hydration , 2001 .

[16]  Michael N. Fardis,et al.  FUNDAMENTAL MODELING AND EXPERIMENTAL INVESTIGATION OF CONCRETE CARBONATION , 1991 .

[17]  Yiying Jin,et al.  Investigation of accelerated and natural carbonation of MSWI fly ash with a high content of Ca. , 2010, Journal of hazardous materials.

[18]  Alain Sellier,et al.  COUPLED MOISTURE-CARBON DIOXIDE-CALCIUM TRANSFER MODEL FOR CARBONATION OF CONCRETE , 2004 .

[19]  M. Liang,et al.  MATHEMATICAL MODELING AND APPLICATIONS FOR CONCRETE CARBONATION , 2003 .

[20]  M. Fardis,et al.  Physical and Chemical Characteristics Affecting the Durability of Concrete , 1991 .