Modelling of Carbon Dioxide Diffusion into Surface-Biodeposited Concrete

Abstract:

To gain an insight into the protective mechanism of surface biodeposition, a theoretical study of carbon dioxide diffusion through surface-biodeposited concrete is required. The present paper proposes a physical model for surface biodeposition and the concept of water-percolated porosity, and develops a theoretical model to predict carbonation of surface-biodeposited concrete structures. The model describes movement and retention of heat, moisture and carbon dioxide by means of balance equations and diffusion laws. The influences of biodeposition and substrate properties on carbon dioxide diffusion are studied by a finite difference model. Results indicate that carbon dioxide diffusion is controlled by both the biodeposition and the substrate. Biodeposition can significantly reduce carbon dioxide concentration at the concrete surface, but this interfacial concentration increases with time.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 3365-3368
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.3365
• Online since: January 2012
• Authors: Pei Hao Li, Wen Jun Qu, Bo Jin
• Keywords: Biodeposition, Carbonation, Durability, Finite Difference Analysis, Modeling

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