Abstract: The compressive strength and impervious performance change rules of BFCC under different curing ages and different stress ratios are studied in this paper. Grey system theory is used to analyze the grey correlation of BFCC compressive strength, electric flux and pore structure parameters. The multi-objective weighted grey target decision model is used to evaluate the comprehensive performance of BFCC under different stress ratios. The results show that the compressive strength of BFCC increases first and then decreases with the increase of fiber length, and the electrical flux value of BFCC decreases continuously. Under the condition of the same stress ratio, the compressive strength of BFCC is increased and the electric flux is decreased when the curing period is prolonged. At the same curing age, when the stress ratio increases, the value of BFCC power flux first decreases and then increases, and it is the smallest when the stress ratio is 0.2, while the compressive strength continues to decrease. According to the results of grey correlation analysis, the bubble spacing coefficient was used to indicate the change of compressive strength and the specific surface area of the bubble was used to represent the change of electric flux. The multi-objective weighted grey target decision model is used to quantitatively evaluate the comprehensive performance of BFCC under different stress ratios. As the stress ratio increases, the relative comprehensive performance index of BFCC decreases and its comprehensive performance deteriorates.
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2021, Vol. 35 
