Characterization of Fly Ash Dominating ASR Suppression Effect by Using SEM-EDS and EBSD

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  • SEM-EDS/EBSDおよび粒子解析を用いたFAのキャラクタリゼーション
  • SEM-EDS/EBSD オヨビ リュウシ カイセキ オ モチイタ FA ノ キャラクタリゼーション

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 Feature analysis of fly ash was carried out for five different fly ashes (equivalent to JIS Class II) with varied levels of alkali-silica reaction (ASR) suppression effect. The purpose of this study was to identify the chemical and physical characteristics of the fly ashes in relation to their ASR suppression effect. The equipment used was a scanning electron microscope (SEM) combined with backscattered electron (BSE) detector, energy dispersive X-ray spectrometer (EDS) and electron backscattered diffraction (EBSD) system. The authors classified fly ash particles into five phases quantitatively by the feature analysis and determined the volume fraction, particle size distribution and specific surface area of each phase. Several amorphous phases were found in the fly ash particles, and an index calculated from the specific surface area and silica content indicated a negative correlation between the phase with Al2O3-SiO2 and the 14-day expansion of mortar bar determined in accordance with ASTM C 1260. The results suggested that this amorphous phase would be a major determinant factor of the ASR suppression effect of fly ashes.

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