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Effect of recycled coarse aggregate on damage of recycled concrete

机译:再生粗骨料对再生混凝土损伤的影响

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摘要

This study evaluates the possibility of measuring the damage of the recycled concrete. In this way, two conventional concretes with a w/c ratio of 0.55 and 0.65 were designed. Based on them, six recycled concretes with different percentages of replacement of natural coarse aggregates with recycled coarse aggregate (20, 50 and 100%) were obtained. To take into account the high absorption capacity of the recycled aggregates, before using them they were pre-wetted for 10 min. The results concluded that scalar damage mechanics (based on the variations of the elastic modulus) and volumetric strains curves can be use to quantify the damage of the recycled concrete. The results from both approaches indicated that the damage to concrete depended on the percentage of replacement, increasing with higher replacement percentages. Additionally, values of the damage, that are quantified using the critical stress and according to the scalar damage mechanics, are given.
机译:这项研究评估了测量再生混凝土损伤的可能性。以这种方式,设计了w / c比为0.55和0.65的两种常规混凝土。在此基础上,获得了六种再生混凝土,分别用再生粗骨料替代天然粗骨料的百分比不同(分别为20%,50%和100%)。考虑到回收骨料的高吸收能力,在使用之前将其预湿10分钟。结果表明,标量损伤机理(基于弹性模量的变化)和体积应变曲线可用于量化再生混凝土的损伤。两种方法的结果均表明,混凝土的损坏取决于更换的百分比,并且随着更换百分比的增加而增加。另外,给出了使用临界应力并根据标量破坏机制量化的破坏值。

著录项

  • 来源
    《Materials and structures》 |2011年第10期|p.1759-1771|共13页
  • 作者单位

    Department of Construction Engineering, School of Civil Engineering, University of A Coruna, E.T.S.I. Caminos, Canales, Puertos. Campus Elvina s, La Coruna 15071, Spain;

    Department of Construction Engineering, School of Civil Engineering, University of A Coruna, E.T.S.I. Caminos, Canales, Puertos. Campus Elvina s, La Coruna 15071, Spain;

    Department of Construction Engineering, School of Civil Engineering, University of A Coruna, E.T.S.I. Caminos, Canales, Puertos. Campus Elvina s, La Coruna 15071, Spain;

    Department of Construction Engineering, School of Civil Engineering, University of A Coruna, E.T.S.I. Caminos, Canales, Puertos. Campus Elvina s, La Coruna 15071, Spain;

  • 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

    recycled concrete; recycled aggregate; damage; scalar damage mechanics; volumetric strain;

    机译:再生混凝土再生骨料;损伤;标量损伤机制;体积应变;

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