Evaluation and Analysis of Pervious Concrete Performance Based on Pore Structure Characterization
To explore the effects of different factors on the mechanical properties,permeability,and pore characteristics of pervious concrete(EPC),four factors of water-cement ratio,aggregate-to-cement ratio,fly ash content,and gangue content were chosen.A single-factor experimental method was adopted to study the influence of each factor at varying levels on EPC performance.The internal pore characteristics of the concrete were quantified using IPP image analysis.Models for the permeability coefficient and compressive strength of EPC were established.The entropy weight method combined with grey correlation theory was utilized for a comprehensive evaluation of the influencing factors on EPC performance.It is found that the compressive strength and splitting tensile strength of EPC are positively correlated,fitting a specific functional relationship.The F of EPC demonstrated a relatively high tensile-to-compressive strength ratio,indicating that fly ash effectively improves EPC toughness.The equivalent pore size was identified as a characteristic pore size.Based on pore characteristics and total slurry area,models for the permeability coefficient and compressive strength of EPC were developed.The M of EPC showed a relatively high correlation,with the highest comprehensive evaluation score of 89.56%when the coal gangue content was 60%.
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