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Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents

机译:偏高岭土基聚合物的反应性和微观结构:粉煤灰和液体/固体含量的影响

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摘要

Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the liquid/solid ratio of paste and, amongst others, the Si/Al ratio of the formed geopolymer network. In this study, fly ash blended metakaolin based geopolymers with varying liquid/solid ratios (l/s), activated by potassium silicate solution, are investigated. Reactivity of metakaolin and fly ash was investigated by powder X-ray diffraction (XRD) and dissolution tests. Reactivity, mechanical properties and microstructure of hardened pastes were analyzed by setting and compressive strength tests, mercury intrusion porosimetry (MIP), capillary water absorption tests, thermogravimetric analysis-differential scanning calorimeter (TGA-DSC), isothermal calorimetry and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The results show that substitution of metakaolin by fly ash as well as variation of l/s brings advantages up to a certain degree, but also has a considerable influence on the pore size distribution, mechanical properties, Si/Al ratio of the geopolymer network and the content of bound water.
机译:地聚合物是基于铝硅酸盐粉末与碱金属硅酸盐溶液的混合物的无机粘合剂。地质聚合物的性能很大程度上取决于反应性固体的类型,浆料的液/固比,以及形成的地质聚合物网络的Si / Al比等。在这项研究中,研究了由硅酸钾溶液活化的具有不同液/固比(l / s)的粉煤灰混合偏高岭土基地质聚合物。通过粉末X射线衍射(XRD)和溶解测试研究了偏高岭土和粉煤灰的反应性。通过凝固和抗压强度测试,压汞法(MIP),毛细管吸水率测试,热重分析-差示扫描量热仪(TGA-DSC),等温量热法和带能量的扫描电子显微镜来分析硬化糊剂的反应性,力学性能和微观结构色散光谱(SEM-EDS)。结果表明,粉煤灰替代偏高岭土以及l / s的变化在一定程度上具有优势,但对孔径分布,力学性能,地聚合物网络的Si / Al比和结合水的含量。

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