Modelling of carbonation of PC and blended cement concrete

Understanding the Process of Carbonation in Concrete using Numerical Modeling

“…The diffusion coefficient of CO 2 plays an important role in the progress of carbonation in concrete. Different methods for the determination of diffusion coefficient of CO 2 have been reported in literature (Bahador and Cahyadi 2009;Khunthongkeaw and Tangtermsirikul 2005;Papadakis et al 1991a;Phung et al 2016;Saetta et al 1993;Song et al 2006). Although, a wide variety of diffusion models have been described in the literature, the basis of their formulation is similar.…”

“…In addition, apart from calcium hydroxide, the volume changes occurring on carbonation of other phases are not completely established yet. Most available models of carbonation, either neglect the influence of the change in porosity, or assume that carbonation would lead to a reduction in porevolume (Bahador and Cahyadi 2009;Isgor and Razaqpur 2004;Khunthongkeaw and Tangtermsirikul 2005;Maekawa et al 2009;Saetta et al 1993;Talukdar et al 2012a;Zhang 2016). Such models are not appropriate for use in systems that are predominated by phases like C-S-H, ettringite, monosulfoaluminate and monocarboaluminate that could lead to an increase in the porosity upon carbonation (De Ceukelaire and Van Nieuwenburg 1993;Justnes et al 2020;Shah and Bishnoi 2018a;Shi et al 2016;Wu and Ye 2015).…”

“…To predict the long-term performance of concrete structures under carbonation, use of empirical model is common (Bahador and Cahyadi 2009;Ekolu 2015;Ho and Lewis 1987;Sanjuán et al 2003;Shah and Bishnoi 2019;Ta et al 2016). It has been shown earlier that for the purpose of extrapolation and prediction, empirical models perform very well.…”