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Influence of the pre-saturation of recycled coarse concrete aggregates on concrete properties

机译：再生粗混凝土骨料的预饱和对混凝土性能的影响

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摘要

The properties of structural concrete which incorporates recycled coarse concrete aggregates (RCCA) may be affected by the RCCA's properties, especially in terms of water absorption, if no technological control methods are adopted in its production. Based on the knowledge of RCCA's water absorption behaviour, this research is aimed at determining the influence of the pre-saturation of the RCCA method on concrete's fresh and hardened properties, compared with a conventional concrete and a recycled aggregates concrete produced using the mixing water compensation method. Both methods can be easily adopted at concrete plants or construction sites. For the establishment of the pre-saturation method procedure, RCCA absorption was thoroughly characterised. A reference concrete and three mixes with replacement ratios of 20%, 50% and 100% of natural coarse aggregates by RCCA were produced, for each method. Tests were performed to determine slump, density, compressive strength, elasticity modulus, shrinkage, water absorption by immersion and capillary water absorption; the surfaces of the mixes were also observed with a magnifying glass. Results showed that mixes produced with the pre-saturation method exhibited slightly worse fresh and hardened properties, and therefore it is concluded that both the pre-saturation method and the mixing water compensation method can be adopted.
机译：如果不采用技术控制方法，则包含再生粗混凝土骨料（RCCA）的结构混凝土的性能可能会受到RCCA的性能的影响，特别是吸水率。基于对RCCA的吸水性能的了解，本研究旨在确定RCCA方法的预饱和度与常规混凝土和使用混合水补偿法生产的再生骨料混凝土相比，对混凝土的新鲜和硬化性能的影响。方法。两种方法都可以在混凝土工厂或建筑工地上轻松采用。为了建立预饱和方法程序，对RCCA的吸收进行了全面表征。对于每种方法，均生产了参考混凝土和三种掺混料，分别用RCCA替代了天然粗骨料的20％，50％和100％。进行测试以确定坍落度，密度，抗压强度，弹性模量，收缩率，浸入式吸水率和毛细管吸水率；混合物的表面也用放大镜​​观察。结果表明，用预饱和方法生产的混合物的新鲜和硬化性能稍差，因此得出结论，可以同时使用预饱和方法和混合水补偿方法。

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  • 来源
    《Magazine of Concrete Research》 |2011年第8期|p.617-627|共11页
  • 作者

    Luis Ferreira; Jorge de Brito; Marilda Barra;

  • 作者单位

    Civil Engineer, Institute Superior Tecnico, Lisbon, Portugal;

    Professor, Instituto Superior Tecnico, Lisbon, Portugal;

    Associate Professor, Faculty of Civil Engineering, Universitat Politecnica de Catalunya, Barcelona, 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
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