ASR products formed in various aggregates of two different concrete mixtures tested both at 38 °C and 60 °C with the concrete prism test have been analysed by scanning electron microscope with energy dispersive X-ray spectroscopy. Additionally, Raman spectra of ASR products have been acquired.
The variations in the chemical composition of ASR products formed in individual aggregates is relatively small. This applies as well to the average composition of ASR products formed in the concrete tested at 38 and 60 °C. However, the Raman spectra of crystalline ASR products formed at 38 °C differ from the ones formed at 60 °C. The first correspond to ones obtained in aggregates of concrete structures, while the later is identical to synthesized shlykovite.