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首页> 外文期刊>Materiali in Tehnologije >EFFECT OF THE BY-PASS CEMENT-KILN DUST AND FLUIDIZED-BED-COMBUSTION FLY ASH ON THE PROPERTIES OF FINE-GRAINED ALKALI-ACTIVATED SLAG-BASED COMPOSITES
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EFFECT OF THE BY-PASS CEMENT-KILN DUST AND FLUIDIZED-BED-COMBUSTION FLY ASH ON THE PROPERTIES OF FINE-GRAINED ALKALI-ACTIVATED SLAG-BASED COMPOSITES

机译：旁路水泥窑粉尘和流化床燃烧粉煤灰对细粉碱活化渣基复合材料性能的影响

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The aim of this work is to investigate the influence of the by-pass cement-kiln dust (CKD) and two types of the fluidized-bed-combustion (FBC) fly ash on the workability, shrinkage and mechanical properties (compressive and flexural strengths) of the water-glass-activated slag. The utilization of CKD and FBC is very problematic. One of the main reasons for this is a high lime and sulfate content in these wastes, which can lead to the formation of expansive hydration products and, consequently, to the cracking of ordinary Portland-cement (OPC) materials. On the other hand, these products might act against the high shrinkage of the alkali-activated slag (AAS). In order to investigate this assumption and the influence of these admixtures on the other properties mentioned above, fine-grained AAS-based composites were prepared. A ground, granulated blast-furnace slag (the reference binder) was partially replaced (0-50 %) by one type of CKD and two types of the FBC fly ash. A significant reduction in the shrinkage was observed on the samples containing an even lower amount of fly ash, while the composites with CKD did not show any notable shrinkage reduction. When using higher dosages of these admixtures the mechanical properties were reduced, but lower dosages did not have such effects, especially as regards the compressive strength. The workability was also strongly dependent on the admixture dosage. Its improvement was observed especially in the case when slag was replaced by up to 30 % of CKD.
机译：这项工作的目的是研究旁路水泥窑粉尘（CKD）和两种流化床燃烧（FBC）粉煤灰对可加工性，收缩率和机械性能（抗压强度和抗弯强度）的影响。 ）的水玻璃活化炉渣。 CKD和FBC的使用存在很大问题。造成这种情况的主要原因之一是这些废物中的石灰和硫酸盐含量高，这可能导致形成膨胀的水合产物，并因此导致普通硅酸盐水泥（OPC）材料的裂解。另一方面，这些产品可能会对抗碱活化矿渣（AAS）的高收缩率。为了研究该假设以及这些掺混物对上述其他性能的影响，制备了细颗粒的基于AAS的复合材料。用一种类型的CKD和两种类型的FBC粉煤灰部分替代（0-50％）磨碎的高炉矿渣渣（参考粘结剂）。在含有什至更低量的粉煤灰的样品上观察到收缩率的显着降低，而具有CKD的复合材料没有显示任何显着的收缩率降低。当使用较高剂量的这些混合物时，机械性能降低，但是较低剂量没有这种效果，特别是在抗压强度方面。可加工性也强烈取决于混合物的用量。观察到它的改善，特别是当炉渣被高达30％的CKD代替时。

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