Grey Correlation Analysis between Chloride Permeability and Pore Structure of Concrete Incorporating Recycled Fine Aggregate from Clay Bricks
ZHAO Shunbo
ZHU Ruifeng
DANG Juntao
MIAO Wei
LIU Yunchi
Abstract：The surface activity of recycled fine aggregate from clay brick(RFCB)with different particle size was evaluated.Furthermore,the effect of particle size distribution,replacement ratio and initial water saturation of RFCB on the chloride permeability and pore structure of concrete incorporating recycled fine aggregate from clay bricks(RBC)was carried out.The results show that the surface activity of RFCB increases with the decrease of particle size in the alkaline environment.The incorporation of RFCB increases the total pore volume and porosity of RBC,but refines the pore size distribution,thus reduces the average pore diameter and the critical pore diameter.The chloride diffusion coefficient and electric flux of RBC are also reduced by 19%-59%and 24%-54%,respectively.Based on the grey correlation theory,the average pore diameter and critical pore diameter parameters are more sensitive to the chloride permeability.On this basis,the mathematical models of chloride ion diffusion coefficient,electric flux and pore structure parameters are established using the multivariate nonlinear regression analysis.
Keywords：recycled fine aggregate from clay brickrecycled concretechloride diffusion coefficientelectric fluxpore structuregrey correlation analysis
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 323-329 )