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Effects of nano-TiO_2 on properties of cement-based materials

机译：纳米TiO_2对水泥基材料性能的影响

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摘要

The effect of titanium dioxide (TiO_2) nanoparticles on early age and long-term properties of cement-based materials is examined experimentally through isothermal calorimetry, chemical shrinkage, setting time, compressive strength and surface microhardness, where part of the cement is replaced with TiO_2. Early age hydration is accelerated by TiO_2 nanoparticles which also increase degrees of hydration of Portland cement, as evidenced by isothermal calorimetry and chemical shrinkage results. With increasing amounts of TiO_2, setting time is reduced, despite decreasing cement content, due to TiO_2 replacement, again showing accelerated hydration. Comparing TiO_2-cement composites from two different TiO_2 manufacturers, results suggest that size of nanoparticles and dispersability are critical in the rate of hydration, with smaller size agglomerates, but not necessarily smaller size particles, producing a greater effect. Compressive strength increases with higher TiO_2 nanoparticle replacement at lower water-to-solids ratio (w/s = 0•40) and strength is not compromised by up to 10% TiO_2 replacement at higher w/s = 0•60. However, microhardness of the composite decreases with higher TiO_2 amount. Broadly, these results indicate that mineral addition as cement replacement can be optimised in terms of dosage and dispersability to achieve lower cement fractions without compromising strength, but that the potential for reductions in hardness should be considered.
机译：通过等温量热法，化学收缩率，凝固时间，抗压强度和表面显微硬度（其中一部分水泥被TiO_2代替），通过实验检查了二氧化钛（TiO_2）纳米颗粒对水泥基材料的早期老化和长期性能的影响。 。等温量热法和化学收缩结果证明，TiO_2纳米颗粒促进了早期水合，这也增加了硅酸盐水泥的水合度。随着TiO_2含量的增加，尽管水泥含量降低，但由于TiO_2的置换，凝结时间减少了，再次显示出加速的水合作用。比较来自两个不同TiO_2制造商的TiO_2-水泥复合材料，结果表明纳米颗粒的大小和分散性对于水合速率至关重要，其中较小的团聚体，但不一定是较小的颗粒，产生更大的效果。在较低的水固比（w / s = 0•40）下使用较高的TiO_2纳米颗粒替代物时，抗压强度会增加，而在较高的w / s = 0•60时，TiO2替代量高达10％不会损害强度。然而，随着TiO_2含量的增加，复合材料的显微硬度降低。广泛地，这些结果表明，可以在剂量和分散性方面优化矿物添加作为水泥的替代品，以在不损害强度的情况下获得较低的水泥含量，但应考虑降低硬度的可能性。

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  • 来源
    《Magazine of Concrete Research》 |2013年第22期|1293-1302|共10页
  • 作者

    Bo Yeon Lee; Amal R. Jayapalan; Kimberly E. Kurtis;

  • 作者单位

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA;

  • 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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