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Effect of recycled coarse aggregate and foundry sand on the properties of self-compacting concrete

机译：再生粗骨料和铸造砂对自密实混凝土性能的影响

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摘要

In this paper, the possibility of utilising foundry sand and recycled coarse aggregate (RCA) obtained from a ready-mix concrete plant for making self-compacting concrete (SCC) was evaluated. In this experiment, 25 concrete mixes were made in which the substitution of RCA was 0, 25, 50, 75 and 100% as coarse aggregate and substitution of foundry sand was 0, 10, 15, 20 and 25% as fine aggregate. The cement content, water and silica fume were kept constant for all 25 mixes. The effects of foundry sand and RCA on the fresh properties of concrete and the hardened properties of SCC were evaluated. The results of the investigation showed that the hardened properties of concrete with 20% foundry sand were significantly improved when compared to conventional concrete. However, the hardened properties of the SCC with 100% RCA were poorer than for conventional concrete with 100% natural coarse aggregate. Strength decreases with the increase in percentage of substitution of RCA. It was found that an M20 grade of structural SCC was achieved with 75% substitution of RCA.
机译：在本文中，评估了利用从预拌混凝土工厂获得的铸造砂和再生粗骨料（RCA）制备自密实混凝土（SCC）的可能性。在该实验中，制备了25种混凝土混合料，其中RCA的粗骨料替代量为0、25、50、75和100％，铸造砂的细骨料替代量为0、10、15、20和25％。所有25种混合物的水泥含量，水和硅粉保持恒定。评估了铸造砂和RCA对混凝土新鲜性能和SCC硬化性能的影响。调查结果表明，与常规混凝土相比，含20％铸造砂的混凝土的硬化性能得到了显着改善。但是，具有100％RCA的SCC的硬化性能比具有100％自然粗骨料的常规混凝土要差。强度随着RCA取代百分比的增加而降低。发现用RCA的75％取代获得了M20等级的结构SCC。

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  • 来源
    《Magazine of Concrete Research》 |2019年第10期|449-460|共12页
  • 作者

    Mahakavi P.; Chithra R.; Kavitha K.;

  • 作者单位

    Sri Ramakrishna Inst Technol, Dept Civil Engn, Coimbatore, Tamil Nadu, India;

    Govt Coll Technol, Dept Civil Engn, Coimbatore, Tamil Nadu, India;

    Govt Coll Technol, Dept Civil Engn, Coimbatore, Tamil Nadu, India;

  • 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; compressive strength; fresh concrete;

    机译：骨料;抗压强度;新鲜混凝土;

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