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首页> 外文期刊>Arabian Journal for Science and Engineering >Effect of Particle Size of Quartz Sand Filler on Microstructure and Strength of Alkali-Activated Slag-Based Materials
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Effect of Particle Size of Quartz Sand Filler on Microstructure and Strength of Alkali-Activated Slag-Based Materials

机译：石英砂填料粒径对碱活性矿渣基材料微观结构和强度的影响

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摘要

Interaction between quartz sand and water glass has been investigated and characterized by using the Si/Na molar ratioto determine the role of silica in the polycondensation rate and mechanical properties of the synthesized materials as afunction of quartz sand particle size. Results of atomic emission spectroscopy, SEM and compressive strength tests showthat interactions between sodium silicate solution and quartz sand depend on the degree of dispersibility that determines thedegree of amorphization of quartz sand. When using ordinary quartz sand sodium silicate solution acts as a thin layer ofglue covering the grains of sand and weakly binds them to each other, while using finely ground quartz sand in the mixturethere is a dissolution–precipitation reaction that modifies the surface layers of the particles and more strongly consolidatingthe granular system. The increase in the molar ratio of Si/Na in sodium silicate solution containing finely ground quartzsand occurs due to the increase in the proportion of amorphous quartz (according to XRD) and corresponds to the describedmechanism. Then, samples of alkali-activated slag-based materials with a coarse ordinary quartz sand and finely groundquartz sand were synthesized, compared in terms of strength and the latter characterized by SEM, porosimetry, XRD. Theincrease of dispersibility and amorphization of quartz sand is established to favors to form consolidated of low-temperaturecuring materials based on alkali-activated slag and quartz sand with the significantly increased compressive strength from30–44 MPa for mixtures based on ordinary coarse quartz sand to 95–140 MPa for finely ground slag/sand blended mixture.
机译：通过使用Si / Na摩尔比研究了石英砂和水玻璃之间的相互作用确定二氧化硅在合成材料的缩聚速率和机械性能中的作用作为a石英砂粒径的功能。原子发射光谱，SEM和抗压强度试验结果表演硅酸钠溶液和石英砂之间的相互作用取决于确定的分散性程度石英砂的非杂化度。当使用普通石英砂钠硅酸钠溶液时用作薄层胶水覆盖着沙粒，弱彼此绑定，在混合物中使用精细研磨的石英砂存在溶解 - 沉淀反应，改变颗粒的表面层，更强烈地固结粒度系统。含有精细研磨的石英钠硅酸钠溶液中Si / Na摩尔比的增加由于无定形石英（根据XRD）的比例增加并且对应于所述描述，因此发生砂机制。然后，用粗糙的普通石英砂和精细研磨的碱活化矿渣基材料样品合成石英砂，在强度和后者的特征在于SEM，Porosimetry，XRD而进行了比较。这建立了石英砂的分散性和非晶态的增加，以便融合巩固低温基于碱活性炉渣和石英砂的固化材料，具有显着提高的抗压强度基于普通粗石英砂的混合物为95-140MPa的30-44MPa，用于精细研磨渣/砂混合物。

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