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
作者单位:

华北水利水电大学

基金项目:

国家自然科学基金资助项目(52208247)


Grey Correlation Analysis Between Chloride Permeability and Pore Structure of Concrete Incorporating Recycled Fine Aggregate from Clay Bricks
Author:
Affiliation:

North China University of Water Resources and Electric Power

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    摘要:

    评价了不同粒径对再生砖细骨料(RFCB)表面活性的影响,研究了RFCB颗粒级配、替代率和初始饱水度对混凝土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的表面活性随着粒径的减小而逐渐增大;相比基准混凝土,掺入RFCB增加了混凝土的总孔隙体积和孔隙率,但是细化了其孔径分布,降低了其平均孔径和最可几孔径,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,建立了氯离子扩散系数、电通量与孔结构参数的数学模型。

    Abstract:

    The influence of different particle size of recycled fine aggregate from clay brick (RFCB) on the surface activity 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 has been carried out. The results showed that the surface activity of RFCB increased with the decrease of particle size in the alkaline environment. Compared with the reference concrete, the incorporation of RFCB increased the total pore volume and porosity of concrete, but refined the pore size distribution, thus reduced the average pore size and the most available pore size. The chloride diffusion coefficient and electric flux was reduced by 19%~59% and 24%~54%, respectively. Based on the grey correlation theory, the highest correlation, the average pore diameter and critical pore diameter were more sensitive to the chloride permeability. On this basis, the mathematical models of chloride ion diffusion coefficient, electric flux and pore structure parameters were established using the multivariate nonlinear regression analysis.

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  • 收稿日期:2024-05-08
  • 最后修改日期:2024-07-25
  • 录用日期:2024-07-26
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