Abstract Amorphous and crystalline alkali silica reaction (ASR) products formed in aggregates of two different concrete mixtures exposed to the concrete prim test both at 38 °C and 60 °C have been analysed by scanning electron microscope with energy dispersive X-ray spectroscopy and by Raman microscopy. Additionally, amorphous ASR products were synthesized and analysed with Raman microscopy and 29Si nuclear magnetic resonance. Amorphous ASR products display a higher Na/K-ratio than crystalline ones. Both types of products display a structure dominated by Q3-sites (Si-tetrahedra with three bridging oxygen atoms typical for a layer structure) with a secondary amount of Q2-sites (Si-tetrahedra with two bridging oxygen atoms typical for a chain structure). Temperature in the CPT alters the structure of the crystalline ASR. While the Raman spectra of the product formed at 38 °C is identical to the one formed in concrete structures, the one of the 60 °C product corresponds to K-shlykovite.

中文翻译：

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混凝土骨料中形成的无定形和结晶 ASR 产品的表征

摘要 通过扫描电子显微镜和能量色散 X 射线光谱仪分析了在 38 °C 和 60 °C 下进行混凝土底漆测试的两种不同混凝土混合物的骨料中形成的无定形和结晶碱硅反应 (ASR) 产物。拉曼显微镜。此外，合成了无定形 ASR 产物，并用拉曼显微镜和 29Si 核磁共振进行分析。无定形 ASR 产品显示出比结晶产品更高的 Na/K 比。两种类型的产品都显示出以 Q3 位点为主的结构（层状结构中典型的具有三个桥接氧原子的 Si-四面体）和次要数量的 Q2 位点（链状结构中典型的具有两个桥接氧原子的 Si-四面体） . CPT 中的温度会改变晶体 ASR 的结构。