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首页> 外文期刊>Magazine of Concrete Research >Experimental study on the fracture toughness of concrete reinforced with rnylti-size polypropylene fibres
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Experimental study on the fracture toughness of concrete reinforced with rnylti-size polypropylene fibres

机译：聚丙烯腈纶增强混凝土的断裂韧性试验研究

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摘要

To study the effect of the addition of multi-size polypropylene fibres (PPFs) on the fracture characteristics of concrete, two sizes of fine PPF and one size of coarse PPF were used to fabricate eight sets of PPF-reinforced concrete notched beam specimens with different fibre mix proportions. Three-point bending tests were conducted to obtain the load-displacement curves of each group of specimens. The test results showed that the addition of mixed fibres led to significant increases in initial fracture toughness and unstable toughness of the concrete specimens. In addition it was found that the smaller the fibre diameter and the closer this diameter to the size of microcracks, the more obvious was the inhibitory effect on microcrack expansion. Specimens mixed with one type of fine PPF showed an increase in initial fracture toughness of 17%. Specimens mixed with three different types of PPF showed an increase of 68% in unstable toughness while specimens with the addition of only one type of fibre showed an increase of only 10%, indicating that the addition of fibres of different sizes produces benefits in mixing and leads to improved unstable toughness. The initial fracture toughness and unstable toughness of each group of specimens were calculated based on the double-k fracture criterion and the mechanism by which fibres improve the fracture characteristics of concrete is discussed.
机译：为了研究添加多尺寸聚丙烯纤维（PPF）对混凝土断裂特性的影响，使用两种尺寸的细PPF和一种尺寸的粗PPF制作了八套不同尺寸的PPF增强混凝土缺口梁试样纤维混合比例。进行了三点弯曲测试，以获得每组试样的载荷-位移曲线。测试结果表明，混合纤维的添加导致混凝土试样的初始断裂韧性和不稳定韧性显着提高。另外，发现纤维直径越小并且该直径越接近微裂纹的尺寸，对微裂纹膨胀的抑制作用越明显。混有一种细PPF的试样的初始断裂韧性提高了17％。掺有三种不同类型PPF的样品的不稳定韧性增加了68％，而仅添加一种纤维的样品显示了仅10％的增加，这表明添加不同尺寸的纤维在混合和混合中均具有益处。导致改善的不稳定韧性。根据双k断裂准则，计算了每组试件的初始断裂韧性和不稳定韧性，并探讨了纤维改善混凝土断裂特性的机理。

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  • 来源
    《Magazine of Concrete Research》 |2019年第10期|468-475|共8页
  • 作者

    Liang Ninghui; Dai Jifei; Liu Xinrong; Zhong Zuliang;

  • 作者单位

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Minist Educ, Key Lab New Technol Construct Cities Mt Area, Chongqing, Peoples R China;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Minist Educ, Key Lab New Technol Construct Cities Mt Area, Chongqing, Peoples R China;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Minist Educ, Key Lab New Technol Construct Cities Mt Area, Chongqing, Peoples R China;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Minist Educ, Key Lab New Technol Construct Cities Mt Area, Chongqing, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    cracks cracking; fibre-reinforced concrete; toughness;

    机译：裂缝和开裂;纤维混凝土;韧性;

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