Several geopolymer-based materials were produced and characterized by mixing metakaolin, a commercial sodium silicate solution, a sodium hydroxide solution, and a loose waste olivine sand deriving from a metallurgical process devoted to the production of a high manganese steel. Olivine sand was added either in the as-received form or after a thermal treatment at 900 °C. Hardened materials containing different amounts of olivine sand were characterized and their behavior was compared to that of a blank geopolymeric matrix. Materials were examined by X-ray diffraction, Fourier Transform Infrared Radiation, and optical and scanning electron microscope investigation; mechanical compressive strength was discussed taking into account water absorption and microstructure. It has been observed that all compositions containing the as-received olivine sands badly perform, whereas those prepared using thermally treated olivine have higher compressive strength than the reference blank composition. In particular, samples with composition containing 100 g of metakaolin and 75 g of olivine displayed the best overall behavior.

Graphical Abstract

中文翻译：

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含冶金废橄榄石砂的地质聚合物基复合材料的制备及性能

生产了几种基于地质聚合物的材料，并通过混合偏高岭土、商业硅酸钠溶液、氢氧化钠溶液和松散的废橄榄石砂来生产和表征，这些废橄榄石砂来自用于生产高锰钢的冶金过程。橄榄石砂以原样或在 900 °C 热处理后添加。对含有不同数量橄榄石砂的硬化材料进行了表征，并将它们的行为与空白地质聚合物基质的行为进行了比较。通过 X 射线衍射、傅里叶变换红外辐射以及光学和扫描电子显微镜研究对材料进行了检查；讨论了机械抗压强度，同时考虑了吸水率和微观结构。已经观察到，所有含有原样橄榄石砂的组合物性能都很差，而使用热处理橄榄石制备的那些组合物具有比参考空白组合物更高的抗压强度。特别是，含有 100 克偏高岭土和 75 克橄榄石的样品表现出最佳的整体性能。

图形概要