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Experimental study on the shear strength of recycled aggregate concrete beams

机译：再生骨料混凝土梁抗剪强度的试验研究

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摘要

In concrete beam design, the shear capacity of the concrete beam is of great interest because shear failure is associated with an abrupt failure mode that undermines the flexural performance of the beam. Recently, because of the increasing cost of natural resources and environmental concerns, the use of recycled aggregate (RA) in construction is becoming the standard practice. However, the effects of recycled aggregates on the shear strength of concrete have not been fully examined. In this study the effects of RA on concrete shear strength are studied experimentally by performing flexural tests on 20 RA concrete beams with various combinations of span-to-depth ratios (a/d = 1.50, 2.50, 3.25), longitudinal reinforcement ratios (s = 0.53%, 0.83%, 1.61%) and RA replacement ratios (0%, 30%, 50%, 100%). The test results indicate that the concrete shear strength diminishes by up to 30% at 100% replacement ratio compared with the natural aggregate concrete. The shear strengths of the RA concrete beams are also compared with those obtained from the existing models for natural aggregate concrete and some design considerations in using the recycled aggregate concrete are discussed.
机译：在混凝土梁的设计中，混凝土梁的抗剪承载力非常受关注，因为剪切破坏与破坏梁的弯曲性能的突然破坏模式有关。最近，由于自然资源成本的增加和对环境的关注，在建筑中使用再生骨料（RA）成为标准做法。但是，再生骨料对混凝土抗剪强度的影响尚未得到充分研究。在这项研究中，通过对20种具有跨-深比（a / d = 1.50，2.50，3.25），纵向钢筋比（s）的组合的20 RA混凝土梁进行挠曲试验，实验研究了RA对混凝土抗剪强度的影响。 = 0.53％，0.83％，1.61％）和RA替换率（0％，30％，50％，100％）。测试结果表明，与天然骨料混凝土相比，在100％置换率下，混凝土的抗剪强度降低了30％。还比较了RA混凝土梁的抗剪强度与从天然骨料混凝土的现有模型获得的抗剪强度，并讨论了使用再生骨料混凝土的一些设计注意事项。

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  • 来源
    《Magazine of Concrete Research》 |2010年第2期|103-114|共12页
  • 作者

    H. B. Choi; C. K. Yi; H. H. Cho; K. I. Kang;

  • 作者单位

    School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea;

    School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea;

    School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea;

    School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-713, Republic of Korea;

  • 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
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