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Investigations on the influence of fly ash on the formation and stability of artificially entrained air voids in concrete

机译：粉煤灰对混凝土中人工夹带气孔的形成和稳定性的影响的研究

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摘要

In concrete, fly ash is applied to a task-oriented improvement of different properties. Besides the advantages, e.g. the improvement of the rheology of the fresh concrete or the density of the hardened concrete, some investigations and the experience from practice indicate that some fly ashes probably influence the formation and stability of artificially entrained air voids. The reason lies presumably in the fraction of unburned carbon, a minor component of the fly ash. To identify the causes, seven fly ashes from European power plants were investigated. The fly ashes were characterized and mortar and concrete tests were conducted to identify specific fly ash parameters which might be responsible for the impaired formation and stability of the air voids. Furthermore, it was examined whether the foam index test is applicable for the assessment of the air entraining agent demand and whether an adequate accuracy of the results is given. On the basis of the results it was also examined whether the mortar tests or a fly ash specific parameter can be applied as an alternative prediction tool to assess the air entraining agent demand for an air entrained concrete.
机译：在混凝土中，粉煤灰应用于不同性质的任务导向型改进。除了优点外随着新鲜混凝土流变性能或硬化混凝土密度的提高，一些研究和实践经验表明，一些飞灰可能会影响人工夹带的空隙的形成和稳定性。原因大概是未燃烧的碳的比例，这是粉煤灰的一小部分。为了查明原因，对欧洲发电厂的七种粉煤灰进行了调查。对粉煤灰进行了表征，并进行了砂浆和混凝土测试，以确定可能导致空隙形成和稳定性降低的特定粉煤灰参数。此外，还检查了泡沫指数测试是否可用于评估引气剂需求，以及结果是否足够准确。基于结果，还检查了是否可以使用砂浆测试或粉煤灰特定参数作为评估空气夹带混凝土对空气夹带剂需求的替代预测工具。

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  • 来源
    《Materials and structures》 |2009年第2期|227-240|共14页
  • 作者

    F. Spoerel; S. Uebachs; W. Brameshuber;

  • 作者单位

    Institute of Building Materials Research, RWTH Aachen University, Schinkelstrasse 3, 52062 Aachen, Germany;

    Institute of Building Materials Research, RWTH Aachen University, Schinkelstrasse 3, 52062 Aachen, Germany;

    Institute of Building Materials Research, RWTH Aachen University, Schinkelstrasse 3, 52062 Aachen, Germany;

  • 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

    fly ash; specific surface; air entraining agents; mortar; air entrained concrete;

    机译：粉煤灰;比表面引气剂;砂浆;引气混凝土;

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