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Influence of mixture composition on the properties of SCC incorporating metakaolin

机译：混合物组成对掺偏高岭土的SCC性能的影响

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摘要

This paper studies and evaluates the properties of self-consolidating concrete (SCC) containing different percentages of metakaolin (MK) by varying the mixture components and mixture proportions. In total, 32 mixtures with varied percentages of MK and mixture compositions are investigated for the effects on compressive strength, flowability, passing ability and high-range water-reducer admixture (HRWRA) demand. The percentage of MK, coarse-to-fine aggregate (C/F) ratio, coarse aggregate size, binder content and percentage of air entrained in the mixture are varied to study the influence of these variables on the fresh properties of SCC containing MK. SCC mixtures containing silica fume and SCC containing slag are also tested for comparison. The results show that increasing the percentage of MK up to 20% in SCC increases the compressive strength, viscosity, passing ability and HRWRA demand, but decreases the flowability of the mixture. In addition, the flowability of SCC mixtures improves with larger aggregate size, higher binder content and higher percentage of entrained air. The passing ability of SCC mixtures also improves with lower C/F ratio, larger aggregate size, higher binder content and the inclusion of entrained air in the mixture. The results also indicate that increasing the binder content or increasing the percentage of the entrained air has the most significant effect on improving the fresh properties of SCC mixtures.
机译：通过改变混合组分和混合比例，研究和评估了含有不同百分比的偏高岭土（MK）的自固结混凝土（SCC）的性能。总共研究了32种MK百分比不同的混合物和混合物组成对抗压强度，流动性，通过能力和高范围减水剂（HRWRA）需求的影响。 MK的百分比，粗骨料与细骨料的比（C / F），粗骨料的大小，粘合剂含量以及混合物中夹带的空气的百分比均发生变化，以研究这些变量对含MK的SCC新鲜特性的影响。还测试了含硅粉的SCC混合物和含SCC的炉渣以进行比较。结果表明，将MK在SCC中的比例提高至20％，可以提高抗压强度，粘度，通过能力和HRWRA需求，但会降低混合物的流动性。另外，SCC混合物的流动性随较大的聚集体尺寸，较高的粘合剂含量和较高的夹带空气百分比而改善。较低的C / F比，较大的集料尺寸，较高的粘合剂含量以及混合物中夹带的空气，SCC混合物的通过能力也会提高。结果还表明，增加粘合剂含量或增加夹带空气的百分比对改善SCC混合物的新鲜性能具有最显着的影响。

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  • 来源
    《Magazine of Concrete Research》 |2014年第20期|1036-1050|共15页
  • 作者

    Assem A. A. Hassan; Justin R. Mayo;

  • 作者单位

    Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St John's, Newfoundland, Canada;

    Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St John's, Newfoundland, Canada;

  • 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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