Numerical analysis of the effect of coarse aggregate distribution on concrete carbonation

Abstract This paper presents the results of a mesoscopic numerical simulation of the influence of the distribution of coarse aggregate on concrete carbonation. In the study, concrete was considered as a two-phase composite material that consisted of cement mortar and coarse aggregate. The numerical simulation results indicate that the concrete carbonation depth decreased and its variation increased with the increased use of coarse aggregates or the increased fraction of relatively small aggregates. It was also found that, for the same coarse aggregate distribution, the variation of the concrete carbonation depth in the core area of the concrete increased with increased penetration depth of carbon dioxide (CO 2 ). On the other hand, such variation in the boundary layers became less significant, since the coarse aggregate distribution density increased with the distance from the perimeter of the concrete.

[1]  J. C. Walraven,et al.  Theory and Experiments on the Mechanical Behaviour of Cracks in Plain and Reinforced Concrete Subjected to Shear Loading , 1981 .

[2]  Renato Vitaliani,et al.  Experimental investigation and numerical modeling of carbonation process in reinforced concrete structures Part I: Theoretical formulation , 2004 .

[3]  Tamon Ueda,et al.  Mesoscale modeling of water penetration into concrete by capillary absorption , 2011 .

[4]  Mark G. Stewart,et al.  Spatial variability of pitting corrosion and its influence on structural fragility and reliability of RC beams in flexure , 2004 .

[5]  Michael N. Fardis,et al.  Experimental investigation and mathematical modeling of the concrete carbonation problem , 1991 .

[6]  Joseph O'Rourke,et al.  Computational Geometry in C. , 1995 .

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

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

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

[10]  Jian‐Jun Zheng,et al.  Simulation of Two-Dimensional Aggregate Distribution with Wall Effect , 2003 .

[11]  G. Ou.  Influences of climate conditions to the concrete carbonization rates , 2004 .

[12]  Renato Vitaliani,et al.  Experimental investigation and numerical modeling of carbonation process in reinforced concrete structures - Part II practical applications , 2005 .

[13]  Adrian Long,et al.  Influence of coarse aggregate on the permeation, durability and the microstructure characteristics of ordinary Portland cement concrete , 2005 .

[14]  Zhang Cheng-zhong.  Calculating model for gas diffusivity in concrete , 2007 .

[15]  R. Jain,et al.  Numerical Methods for Scientific and Engineering Computation , 1985 .

[16]  W. Hartt,et al.  Modeling Corrosion Initiation of Reinforcing Steel in Concrete: Effect of Non-diffusive Coarse Aggregate , 2011 .

[17]  Xin Ruan,et al.  Mesoscopic simulation method of concrete carbonation process , 2012 .

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

[19]  S. Cho,et al.  Influence of aggregate content on the migration coefficient of concrete materials using electrochemical method , 2003 .