再生砖细骨料混凝土抗氯离子渗透性能与孔结构的灰色关联分析

Grey Correlation Analysis between Chloride Permeability and Pore Structure of Concrete Incorporating Recycled Fine Aggregate from Clay Bricks

摘要:

评价了不同粒径再生砖细骨料（RFCB）的表面活性，研究了RFCB颗粒级配、替代率和初始饱水度对再生砖细骨料混凝土（RBC）抗氯离子渗透性能和孔隙结构的影响.结果表明：在碱性环境下，RFCB的表面活性随其粒径减小而逐渐增大；RFCB的掺入增加了混凝土的总孔隙体积和孔隙率，但细化了其孔径分布，降低了其平均孔径和最可几孔径；RFCB还减小了混凝土的氯离子扩散系数和电通量，分别降低了19%~59%和24%~54%.最后，基于灰色关联理论和多元非线性回归分析，确定了与RBC抗氯离子渗透性能关联度最高的平均孔径、最可几孔径参数，建立了RBC氯离子扩散系数、电通量与孔结构参数的数学模型.

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.