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首页> 外文期刊>Journal of Materials Science >The effect of activating solution on the mechanical strength, reaction rate, mineralogy, and microstructure of alkali-activated fly ash
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The effect of activating solution on the mechanical strength, reaction rate, mineralogy, and microstructure of alkali-activated fly ash

机译：活化溶液对碱活化粉煤灰的机械强度，反应速率，矿物学和微观结构的影响

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摘要

Alkali-activated fly ash (AAF) is a promising material that exhibits comparable material properties as cement-based materials but with much less CO2 emission. In the present work, the effect of activating solution (SiO2 and Na2O content) on the performance of AAF was studied by means of isothermal calorimetry and X-ray diffraction analysis. Meanwhile, the pore structure of AAF was examined by mercury intrusion porosimetry combined with environmental scanning electron microscope. The results indicate that increasing the sodium oxide content leads to a higher extent of reaction, denser matrix and higher possibility of crystallization, corresponding to a higher compressive strength of AAF. The addition of silica in the alkaline solution retards the reaction rate and zeolite formation, while improves the microstructure of the matrix. Therefore, there is an optimal value for SiO2 with respect to the Na2O content for the AAF in this study.
机译：碱活化粉煤灰（AAF）是一种很有前途的材料，具有与水泥基材料相当的材料性能，但二氧化碳排放量却低得多。通过等温量热法和X射线衍射分析研究了活化液（SiO2和Na2O含量）对AAF性能的影响。同时，采用压汞法与环境扫描电子显微镜相结合的方法对AAF的孔结构进行了研究。结果表明，增加氧化钠含量导致更高的反应程度，更致密的基体和更高的结晶可能性，这对应于AAF的更高的抗压强度。在碱性溶液中添加二氧化硅会延迟反应速度和沸石的形成，同时改善基质的微观结构。因此，在本研究中，相对于AAF中的Na2 O含量，存在SiO2 的最佳值。

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    《Journal of Materials Science》 |2012年第11期|p.4568-4578|共11页
  • 作者

    Y. Ma; J. Hu; G. Ye;

  • 作者单位

    Section Materials and Environment, Faculty of Civil Engineering and Geosciences, CiTG, Delft University of Technology, Stevinweg 1, 2628CN, Delft, The Netherlands;

    Section Materials and Environment, Faculty of Civil Engineering and Geosciences, CiTG, Delft University of Technology, Stevinweg 1, 2628CN, Delft, The Netherlands;

    Section Materials and Environment, Faculty of Civil Engineering and Geosciences, CiTG, Delft University of Technology, Stevinweg 1, 2628CN, Delft, The Netherlands;

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