基于硬化混凝土骨料多重分形特征的混凝土流变关联性研究

为研究新拌混凝土流变性与混凝土骨料结构的关联性,基于多重分形理论获取了硬化混凝土骨料结构的多重分形谱,构建了多重分形指标F并研究其与新拌混凝土流变参数的相关关系,将其与单一分形方法进行对比分析。结果表明,硬化混凝土骨料结构的多重分形谱参数与新拌混凝土流变参数呈弱相关关系,而新构建的多重分形指标F与新拌混凝土流变性相关性明显;相较于单一分形维数,多重分形谱参数能更加精确地反映混凝土骨料结构及形态对新拌混凝土流变性的影响。

Research on Rheological Correlation of Aggregate Gradation Based on Multifractal Features of Hardened Concrete

To study the relationship between rheology of fresh concrete and aggregate structure,the multifractal spectrum of aggregate structure is obtained according to the multifractal theory.A multifractal index Fis proposed and the connection between F and rheological parameters of fresh concrete has been analyzed.The relationship is compared with the single fractal method.The results show that the rheological parameters of fresh concrete have a weak correlation with the multifractal spectrum parameters of the hardened concrete aggregate structure,but it has a significant connection to F.Compared with a single fractal dimension,the multifractal spectrum parameters can more accurately reflect the impacts of concrete aggregate structure and morphology on the rheology of fresh concrete.