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Effect of coarse aggregate content on shear friction of concrete

机译：粗骨料含量对混凝土剪切摩擦的影响

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摘要

Shear friction behaviour of normal-and high-strength concretes made with different amounts of coarse aggregate was investigated in this study. A total of 48 push-off specimens were made and tested. Twenty-four of the specimens were made with normal-strength concrete; the rest were made with high-strength concrete. The test variables included the concrete strength, coarse aggregate content and amount of shear reinforcement. The results show that an increase in coarse aggregate content would increase the splitting strength of concrete cylinder, ultimate shear friction strength and shear ductility of the push-off specimens for normal-strength concrete. However, there should be an upper bound of 950 kg/m(3) to ensure better ultimate shear friction strength and ductility for high-strength concretes. The same amount of coarse aggregate could be the lower bound for normal-strength concretes to achieve the code-specified splitting strength. The ACI code shear friction strength calculations are conservative. The. modification factor for normal-weight concrete as specified in the code may be raised up to 1.3, which was the lower bound found in this study.
机译：研究了不同数量的粗骨料制成的普通和高强度混凝土的剪切摩擦性能。总共制作并测试了48个下推样本。 24个标本是用普通强度混凝土制成的。其余的则用高强度混凝土制成。测试变量包括混凝土强度，粗骨料含量和抗剪强度。结果表明，粗骨料含量的增加会增加普通强度混凝土推力试件的混凝土圆筒劈裂强度，极限剪切摩擦强度和剪切延性。但是，应该有一个950 kg / m（3）的上限，以确保更好的极限剪切摩擦强度和高强度混凝土的延展性。相同数量的粗骨料可能是普通强度混凝土的下限，以达到规范规定的劈裂强度。 ACI规范的剪切摩擦强度计算是保守的。的。规范中规定的普通重量混凝土的修改系数可以提高到1.3，这是本研究的下限。

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  • 来源
    《Magazine of Concrete Research》 |2019年第6期|217-227|共11页
  • 作者

    Lin Chien-Hung; Sun Wen-Chang; Xu Jiamin; Lin Bo-Yao; Lin Hua-Xi;

  • 作者单位

    Natl Chung Hsing Univ, Dept Civil Engn, Taichung, Taiwan;

    Natl Chung Hsing Univ, Dept Civil Engn, Taichung, Taiwan;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China;

    Taiwan Power Co, Taichung, Taiwan;

    Sheng Yu Construct Co Ltd, Taichung, Taiwan;

  • 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

    aggregates; load transfer; shear;

    机译：骨料;荷载传递;剪切;

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