异形微型碳纤维复合材料对混凝土力学性能的影响

THE INFLUENCE OF SPECIAL MICRO-CARBON FIBER COMPOSITE MATERIAL ON MECHANICAL PROPERTIES OF CONCRETE

通过轴心拉伸试验考察了棒状、片状(宽、窄)、波浪形这几种异形微型聚丙烯腈(PAN)基碳纤维复合材料对混凝土力学性能的影响。实验表明:碳纤维复合材料的加入可以有效、较大程度地提高混凝土的抗拉强度、强度和抗折强度。其中,与基准混凝土相比,异形微型碳纤维增强混凝土的抗拉强度最大可提高64%;增强混凝土的标号最大可从C40~C45级增加为C60级;随着复合材料比表面积和的增加,增强混凝土的强度和抗折强度最大可分别提高45.6%和50.6%;此外,在相同尺寸及比表面积下,波浪形碳纤维混凝土比片状碳纤维混凝土更难被折断。以上均证明PAN基碳纤维复合材料对混凝土有较好的增韧作用。

This article studies the influence of concrete＇ s mechanical properties of four kind of special microcarbon fiber composites under rod,flake（ wide and narrow）,wave and so on by axis tensile test. Experiments show that the addition of carbon fiber composite materials can be effective and largely improve the tensile strength,strength and flexural strength of concrete. The tensile strength of special micro-carbon fiber composite materials can maximum increase 64% compared with the reference concrete. The grades of reinforced concrete can be increased from C40 ～ C45 to C60; As the increase of the sum of specific surface area of carbon fiber composites,the strength and flexural strength of concrete can both maximum increase 45. 6% and 50. 6% respectively. Besides,flake carbon fiber concrete is more likely to be broken than wavy under the same size and specific surface area. All of above prove PAN-based carbon fiber composite materials have a better increase of concrete＇s toughness.