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首页> 外文期刊>ceramics >COMPARISON OF KAOLIN AND KAOLINITIC CLAYSTONES AS RAW MATERIALS FOR PREPARING METAKAOLINITE-BASED GEOPOLYMERS
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COMPARISON OF KAOLIN AND KAOLINITIC CLAYSTONES AS RAW MATERIALS FOR PREPARING METAKAOLINITE-BASED GEOPOLYMERS

机译：高岭土和高岭土粘土作为原料制备偏高岭土基地聚合物的比较

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摘要

One kaolin and two kaolinitic claystones were characterised (XRD,XRF, FTIR, TG, SEM, MIP), dehydrated at 750 degrees C, finely ground and mixed with an alkali activator in weight ratios of 55:80, 55:75, 60:70, 65:65, 70:60 and 75:55. Geopolymer binders were then prepared by water addition up to an invariable content of 34 wt. %. The binders were finally mixed with quartz sand in a weight ratio of 40:60. The differences in the properties between the two types of clay materials, the changes in these properties due to dehydration and milling, and the impact of the observed differences on the properties of the geopolymer binders (dynamic viscosity, pore size distribution, colour shade) and filled geopolymers (flexural strength, compressive strength, elastic modulus) were investigated. The kaolinitic claystones had a morphology different from the kaolin, characterised by smaller kaolinite plates, significantly lower pore volumes with average pore diameters and a higher impurities content that caused a more intense colour compared to the kaolin. The above-mentioned differences remained unchanged after thermal and mechanical treatment of the starting clay materials. The geopolymer binders prepared front the calcined and milled kaolinitic claystones were darker in colour and had a significantly lower dynamic viscosity (approximately three times) compared to the geopolymer binders prepared from the kaolin. The dynamic viscosity decreased with the decreasing activator content, while the volume and pore size increased. The mechanical properties of all the prepared geopolymers were excellent (compressive strength 50 MPa, bending strength 7.9 MPa and elastic modulus 15 GPa) up to a ratio of metakaolinite component/alkali activator of 1:1.
机译：表征一种高岭土和两种高岭土（XRD，XRF，FTIR，TG，SEM，MIP），在750摄氏度下脱水，精细研磨并与碱活化剂按重量比55：80、55：75、60： 70、65：65、70：60和75:55。然后通过加水至高达34 wt。％的恒定含量来制备地聚合物粘合剂。 ％。最后将粘合剂与石英砂以40:60的重量比混合。两种类型的粘土材料之间的特性差异，由于脱水和磨碎而导致的这些特性变化以及所观察到的差异对地质聚合物粘结剂的特性（动态粘度，孔径分布，色泽）和研究了填充的地质聚合物（抗折强度，抗压强度，弹性模量）。高岭土粘土具有与高岭土不同的形态，其特征在于较小的高岭石板，具有平均孔径的孔体积显着较低，杂质含量较高，与高岭土相比，颜色更浓。在对起始粘土材料进行热处理和机械处理之后，上述差异保持不变。与由高岭土制备的地聚合物粘合剂相比，煅烧和磨碎的高岭土粘土制备的地聚合物粘合剂的颜色更深，并且具有显着更低的动态粘度（约三倍）。动态粘度随活化剂含量的降低而降低，而体积和孔径增大。在偏高岭石组分/碱活化剂之比为1：1的情况下，所有制备的地质聚合物的机械性能均极佳（抗压强度> 50 MPa，弯曲强度> 7.9 MPa和弹性模量> 15 GPa）。

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  • 来源
    《ceramics》 |2019年第1期|110-123|共14页
  • 作者

    Koutnik Petr; Soukup Ales; Bezucha Petr; Safar Jan; Hajkova Pavlina; Cmelik Jiri;

  • 作者单位

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

    Unipetrol Ctr Res & Educ, Revolucni 1521-28, Usti Nad Labem 40001, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    Kaolin; Kaolinite; Claystone; Geopolymer; Rheology;

    机译：高岭土;高岭石;粘土岩;地聚合物;流变学;

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