›› 2009, Vol. 30 ›› Issue (1): 52-58.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Influence of two-dimensional aggregate random distribution in concrete on substance diffusion

ZHAO Yan-lin 1, 2, WEI Ke-yu1, LÜ Hai-bo1   

  1. 1. Research Institute of Preventing and Mitigating Disasters, College of Civil Engineering, Guangxi University, Nanning 530004, China; 2. Guilin University of Technology , Guilin 541004, China
  • Received:2007-06-06 Online:2009-01-10 Published:2011-01-14

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Abstract:

Concrete is regarded as a composite consisting of coarse aggregate and mortar matrix. A model of two-dimensional aggregate random distribution is developed with improving judgment of overlap between two aggregates. Based on the model, the concrete carbonization is taken as the example and the obstacle effect of aggregate random distribution in the CO2 diffusion is analyzed. The results show that the diffusion path of CO2 is influenced by the shape, size and position of the single aggregate; and aggregates influence the speed of diffusion by changing the length and the tortuosity of diffusion path. The roundness ?, average diameter d and content of aggregates ra have the fine corresponding relations with the diffusion coefficient of the concrete Da. The equations are established by numerical simulation to describe the relationships Da-?, Da-d, Da-ra in two-dimensional diffusion, which are convenient for future engineering application.

Key words: concrete, substance diffusion, aggregate distribution, computational simulation

CLC Number: 

  • TU 528
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