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首页> 外文期刊>Construction and Building Materials >High performance concrete with Czech metakaolin: Experimental analysis of strength, toughness and durability characteristics
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High performance concrete with Czech metakaolin: Experimental analysis of strength, toughness and durability characteristics

机译：捷克偏高岭土的高性能混凝土：强度，韧性和耐久性能的实验分析

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摘要

Although the capability of metakaolin as pozzolanic material to improve mechanical and durability properties of concrete if used as partial replacement of Portland cement is well noted in concrete science, its utilization in building industry was limited to date, mainly due to its high price dictated by the low production amounts. However, with the current shortage of silica fume and high-quality slag in some countries the attitude of concrete producers to metakaolin may change in the near future. This change of mind can be facilitated by providing a more comprehensive view of the properties of composite materials with metakaolin, thus contributing to wider realization of the benefits of metakaolin in concrete. In this paper, an extensive set of parameters of high performance concrete (HPC) with metakaolin including basic physical characteristics, mechanical and fracture-mechanical properties, durability characteristics, hydric and thermal properties and chloride binding characteristics is measured. The experimental results show that the replacement of Portland cement by 10% of metakaolin as an optimal amount leads in most cases either to improvements or at least does not significantly impair substantial properties of the analyzed HPC. Basic physical properties and heat transport and storage properties are very similar to common HPC, mechanical and fracture-mechanical properties after 28 days are slightly worse but later improved, water- and water vapor transport parameters are substantially reduced, frost resistance is better, resistance against de-icing salts is slightly worse but still meets very well the required criteria. The chemical resistance of concrete with 10% of metakaolin instead of Portland cement in distilled water and HC1 is found better than for Portland cement concrete, in MgCl_2 it is slightly worse, and in NH_4Cl, Na_2SO_4 and CO_2 almost the same, carbonation is reduced, and chloride binding capacity is increased.
机译：虽然偏高岭土作为火山灰材料的能力（如果用作硅酸盐水泥的部分替代品）可以改善混凝土的机械性能和耐久性，但在混凝土科学中已广为人知，但迄今为止，其在建筑行业中的使用受到限制，这主要是由于其价格昂贵。低产量。然而，由于某些国家目前硅粉短缺和高品质炉渣，混凝土生产商对偏高岭土的态度在不久的将来可能会改变。可以通过更全面地了解偏高岭土复合材料的性能来促进这种想法的改变，从而有助于更广泛地实现偏高岭土在混凝土中的益处。在本文中，对偏高岭土的高性能混凝土（HPC）的广泛参数进行了测量，包括基本物理特性，机械和断裂力学特性，耐久性特性，水热特性和氯离子结合特性。实验结果表明，在大多数情况下，用10％的偏高岭土替代波特兰水泥可导致改善或至少不会显着损害所分析HPC的实质性能。基本物理性能以及热传递和存储性能与普通HPC非常相似，28天后的机械和断裂机械性能稍差，但后来有所改善，水和水蒸气的输送参数大大降低，抗冻性更好，耐除盐盐的效果稍差，但仍非常符合所需标准。发现在蒸馏水和HCl中用10％偏高岭土代替波特兰水泥的混凝土的耐化学性比波特兰水泥混凝土更好，在MgCl_2中稍差一些，在NH_4Cl，Na_2SO_4和CO_2中几乎相同，碳化减少了，氯化物结合能力增加。

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  • 来源
    《Construction and Building Materials》 |2010年第8期|p.1404-1411|共8页
  • 作者

    Eva Vejmelkova; Milena Pavlikova; Martin Keppert; Zbynek Kersner; Pavla Rovnanikova; Michal Ondracek; Martin Sedlmajer; Robert Cerny;

  • 作者单位

    Department of Materials Engineering and Chemistry, Faculty of Civil Engineering Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic;

    rnDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic;

    rnDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic;

    rnInstitute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology, Veveri 95, 602 00 Brno, Czech Republic;

    rnInstitute of Chemistry, Faculty of Civil Engineering, Brno University of Technology, Zizkova 17, 602 00 Brno, Czech Republic;

    rnInstitute of Technology of Building Materials and Components, Faculty of Civil Engineering, Brno University of Technology, Veveri 95, 602 00 Brno, Czech Republic;

    rnInstitute of Technology of Building Materials and Components, Faculty of Civil Engineering, Brno University of Technology, Veveri 95, 602 00 Brno, Czech Republic;

    rnDepartment of Materials Engineering and Chemistry, Faculty of Civil Engineering Czech Technical University in Prague, Thakurova 7, 166 29 Prague 6, Czech Republic;

  • 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

    high performance concrete; metakaolin; compressive strength; fracture toughness; durability;

    机译：高性能混凝土;偏高岭土;抗压强度;断裂韧性耐用性;

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