Influence of Recycled Aggregates Volume Fraction on Chloride Diffusion in Model Recycled Aggregates Concrete
In this paper, the influence of recycled aggregates volume fraction (Fra) on chloride induced permeability of recycled aggregates concrete (RAC) was investigated. Finite element analyses of single modeled RAC with regular aggregate arrangements were performed. The recycled aggregate fraction (Fra ) was varied between 0.38 and 0.63. The finite element method (FEM) were based on a mass diffusion approach in which RAC were simplified as three-phase cylindrical inclusions with 1 mm thickness. The analysis results were interpreted by change of permeability. The results show that the chloride concentration on the corresponding boundary vary wavely in a wide range from from 0.00196603 (mg/mm3) to 0.00238315 (mg/mm3) and increase entirely with the increasing Fra due to the influence of old adhered mortar. The effective chloride diffusivities of RAC and the value of chloride amount increase linearly with the increasing Fra.
J. W. Ying and H. G. Chen, "Influence of Recycled Aggregates Volume Fraction on Chloride Diffusion in Model Recycled Aggregates Concrete", Advanced Materials Research, Vols. 261-263, pp. 151-155, 2011