Influence of Wind Pressure on the Carbonation of Concrete

Materials

Dujian Zou²  Tiejun Liu¹  Chengcheng Du²  Jun Teng² 

[1] Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China;

关键词: concrete;    carbonation;    penetration mass transfer;    wind pressure;    Klinkenberg effect;   

DOI  :  10.3390/ma8084652

来源: mdpi

【 摘 要 】

Carbonation is one of the major deteriorations that accelerate steel corrosion in reinforced concrete structures. Many mathematical/numerical models of the carbonation process, primarily diffusion-reaction models, have been established to predict the carbonation depth. However, the mass transfer of carbon dioxide in porous concrete includes molecular diffusion and convection mass transfer. In particular, the convection mass transfer induced by pressure difference is called penetration mass transfer. This paper presents the influence of penetration mass transfer on the carbonation. A penetration-reaction carbonation model was constructed and validated by accelerated test results under high pressure. Then the characteristics of wind pressure on the carbonation were investigated through finite element analysis considering steady and fluctuating wind flows. The results indicate that the wind pressure on the surface of concrete buildings results in deeper carbonation depth than that just considering the diffusion of carbon dioxide. In addition, the influence of wind pressure on carbonation tends to increase significantly with carbonation depth.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.