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首页> 美国卫生研究院文献>Materials >Fractal Dimension of Basalt Fiber Reinforced Concrete (BFRC) and Its Correlations to Pore Structure Strength and Shrinkage
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Fractal Dimension of Basalt Fiber Reinforced Concrete (BFRC) and Its Correlations to Pore Structure Strength and Shrinkage

机译：玄武岩纤维钢筋混凝土（BFRC）的分形尺寸及其与孔隙结构强度和收缩的相关性

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摘要

In this study, we focused on exploring the correlations between the pore surface fractal dimensions and the pore structure parameters, strength and shrinkage properties of basalt fiber-reinforced concrete (BFRC). The pore structure of BFRCs with various fiber contents and fiber lengths was investigated using mercury intrusion porosimetry (MIP) measurements. Through Zhang’s model, the fractal characteristics of BFRCs in the whole pore size range and in different pore size ranges were calculated from the MIP test data. The results showed that the addition of BF increased the total porosity, total pore volume and pore area but decreased the average pore diameter, indicating that BFs refined the pore structure of the concrete. BFRC presented obvious fractal characteristics in the entire pore-size range and individual pore-size ranges; generally, the fractal dimension increased with increasing fiber content. Moreover, correlation analysis suggested that the fractal dimension of BFRC in the whole pore-size range (FD) was closely related to the fractal dimension in the macropore region (D ) and average pore diameter (APD). The influence of pore structure factors on mechanical strength and shrinkage was studied by grey correlation theory, and the results showed that D showed positive correlations with strength and fracture energy, with increasing D tending to strengthen and toughen the concrete. An increase in fiber content and length was detrimental to reducing the drying shrinkage strain. In the transition pore region, the fractal dimension (D ) at diameters ranging from 20 to 50 nm and shrinkage strain exhibited a highly linear relation. These results merit careful consideration in macro-property evaluation by using the pore surface fractal dimension in a specific region instead of the whole region. Finally, grey target theory was applied to evaluate the rank of the mechanical strength and shrinkage of concrete, and the results showed that the overall properties of concrete with a BF length of 18 mm and a BF content of 0.06% ranked the best.
机译：在这项研究中，我们专注于探索孔隙表面分形尺寸与玄武岩结构参数，强度和收缩性能之间的相关性，强度和收缩性能（BFRC）。采用汞侵入孔隙瘤（MIP）测量研究了具有各种纤维含量和纤维长度的BFRC的孔结构。通过张模型，从MIP测试数据计算了整个孔径范围和不同孔径范围内的BFRC的分形特征。结果表明，添加BF增加了总孔隙，总孔体积和孔面积，但降低了平均孔径，表明BFS精制混凝土的孔结构。 BFRC在整个孔径范围和单个孔径范围内呈现明显的分形特征;通常，分形尺寸随着纤维含量的增加而增加。此外，相关分析表明，整个孔径范围（FD）中BFRC的分形尺寸与大孔区（D）和平均孔径（APD）的分形尺寸密切相关。通过灰色相关理论研究了孔隙结构因素对机械强度和收缩的影响，结果表明D与强度和断裂能量显示出正相关，随着混凝土的增强和强化而增加。纤维含量和长度的增加是有害降低干燥收缩菌株。在过渡孔区域中，直径为20至50nm的直径和收缩应变的分形尺寸（d）表现出高度线性的关系。这些结果通过在特定区域代替整个区域中使用孔表面分形尺寸来仔细考虑宏观性评估。最后，应用灰色目标理论来评估混凝土机械强度和收缩的级别，结果表明，BF长度为18毫米的混凝土的总体性质，BF含量为0.06％。

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