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Mutual interactions between carbonation and titanium dioxide photoactivity in concrete

机译：混凝土中碳化与二氧化钛光活性之间的相互作用

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摘要

The use of building materials modified with photocatalytic components is constantly growing, due to an increased need for efficient purification strategies to improve air quality in industrial and urban areas. Yet, few works are available on the actual behavior of photocatalysts integrated in supporting materials, in this case concrete, and on the alteration of their properties in time. This work focuses on mechanical and durability aspects of TiO2-containing photocatalytic concrete by examining mutual influences between TiO_2 and concrete components, and their evolution with the material aging. Experimental tests showed that concrete rheological properties decreased by adding TiO_2; mechanical resistance also decreased slightly, in spite of the filler effect expected from the addition of a nanopowder. On the other hand, carbonation decreased the material photocatalytic efficiency compared to the freshly cast specimens: this was ascribed to variations of pore solution chemistry and possible shielding effects produced by calcium carbonate precipitation.
机译：由于对提高工业和城市地区空气质量的有效净化策略的需求不断增加，使用光催化成分改性的建筑材料的使用正在不断增长。然而，关于集成在支撑材料（在这种情况下为混凝土）中的光催化剂的实际行为以及其性能随时间变化的工作很少。这项工作通过研究TiO_2与混凝土组分之间的相互影响以及随着材料老化的发展，着眼于含TiO2光催化混凝土的机械和耐久性方面。试验表明，加入TiO_2会降低混凝土的流变性能。尽管预期会由于添加纳米粉而产生填充效果，但机械阻力也略有下降。另一方面，与新鲜铸造的样品相比，碳化降低了材料的光催化效率：这归因于孔溶液化学的变化以及碳酸钙沉淀可能产生的屏蔽作用。

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  • 来源
    《Building and Environment》 |2013年第4期|174-181|共8页
  • 作者

    M.V. Diamanti; F. Lollini; M.P. Pedeferri; L Bertolini;

  • 作者单位

    Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "C. Natta", Via Mancinelli 7, 20131 Milan, Italy;

    Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "C. Natta", Via Mancinelli 7, 20131 Milan, Italy;

    Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "C. Natta", Via Mancinelli 7, 20131 Milan, Italy;

    Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "C. Natta", Via Mancinelli 7, 20131 Milan, Italy;

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  • 正文语种 eng
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  • 关键词

    aging; carbonation; concrete; photocatalysis; titanium dioxide;

    机译：老化;碳化具体;光催化二氧化钛;

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