拉曼光谱在地质聚合物反应度研究中的潜力,Journal of Raman Spectroscopy

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拉曼光谱在地质聚合物反应度研究中的潜力
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2021-06-05 , DOI: 10.1002/jrs.6167
Maria Cristina Caggiani ₁ , Alessia Coccato ₁ , Germana Barone ₁ , Claudio Finocchiaro ₁ , Maura Fugazzotto _{1,

2} , Gabriele Lanzafame ₁ , Roberta Occhipinti ₁ , Antonio Stroscio ₁ , Paolo Mazzoleni ₁

Affiliation

碱活化材料 (AAM) 和“地质聚合物”是通过将固体铝硅酸盐前体与碱性溶液（通常为 KOH 或 NaOH 和 Na ₂ SiO _{3 ）混合而获得的无机聚合物材料}以各种比例混合）。此类硅铝酸盐材料已成为传统混凝土的更环保替代品，适用于大规模应用以及建筑遗产保护和修复等利基应用。在这项工作中，我们将拉曼光谱应用于硅铝酸盐前体（偏高岭土、浮石、火山灰、火山土壤、粘土沉积物、陶瓷废料）和相应的 AAM。在振动光谱学领域，拉曼在傅里叶变换红外 (FTIR) 方面的文献中很少使用，以从分子的角度深入了解碱活化过程。本文的目的是研究拉曼方法在比较所用原材料与各自 AAM 方面的潜力。在地质聚合的最初几个小时内，还对粘土沉积物和陶瓷废料产品进行了拉曼分析。根据所采用的前体不同，结果显示出与结晶相和无定形相相关的光谱，可以指示新形成的铝硅酸盐凝胶。

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Raman spectroscopy potentiality in the study of geopolymers reaction degree

Alkali-activated materials (AAMs) and “geopolymers” are inorganic polymeric materials obtained by mixing of solid aluminosilicate precursors with an alkaline solution (generally, KOH or NaOH and Na₂SiO₃ mixed in various ratios). This class of aluminosilicate materials has emerged as a greener alternative to traditional concrete, for large-scale as well as for niche applications such as conservation and restoration of built heritage. In this work we apply Raman spectroscopy both to aluminosilicate precursors (metakaolin, pumice, volcanic ash, volcanic soils, clayey sediments, ceramic waste) and to the respective AAMs. In the field of vibrational spectroscopy, Raman is much less employed in the literature with respect to Fourier transform infrared (FTIR) to have insights into the alkali activation process from a molecular point of view. The aim of this paper is to investigate the potentiality of a Raman approach to the comparison of the employed raw materials with the respective AAMs. Raman analyses during the first hours of geopolymerization were also carried out on the clayey sediments and ceramic waste-based products. The results, differentiated according to the employed precursors, exhibit spectra relative to crystalline and amorphous phases that can give an indication about the newly formed aluminosilicate gel.

更新日期：2021-06-05

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